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Committer: Suren A. Chilingaryan
Date: 2010-08-17 01:41:15 UTC
Revision ID: csa@dside.dyndns.org-20100817014115-xbh0h6086nz5sj2o

Synchronize with Chris version, set precision to 1, initial implementation of labview wrapper

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style='font-size:24.0pt;mso-ansi-language:EN-US'>Digital Image Correlation<o:p></o:p>

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style='font-size:24.0pt;mso-ansi-language:EN-US'>and Tracking with Matlab<o:p></o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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<span lang=EN-US

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style='mso-ansi-language:EN-US'>Programmed by:<o:p></o:p>

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style='mso-ansi-language:EN-US'><o:p> </o:p>

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<span

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style='mso-ansi-language:EN-US'>Christoph Eberl, Robert Thompson, Daniel

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Gianola<o:p></o:p>

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<span

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style='mso-ansi-language:EN-US'>@ <st1:place w:st="on"><st1:PlaceName w:st="on">Johns</st1:PlaceName>

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<st1:PlaceName w:st="on">Hopkins</st1:PlaceName> <st1:PlaceType w:st="on">University</st1:PlaceType></st1:place>,

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Group of Kevin J. Hemker<o:p></o:p>

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style='mso-ansi-language:EN-US'><a href="mailto:Chris.eberl@jhu.edu">chris.eberl@jhu.edu</a><o:p></o:p>

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AR-SA'>

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<span style='font-size:18.0pt;

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mso-ansi-language:EN-US'>1. Introduction<o:p></o:p>

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<span style='mso-ansi-language:

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<span style='mso-ansi-language:

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EN-US'>Measuring strain in samples which are too small, big, compliant, soft or

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hot are typical scenarios where non-contact techniques are needed. A technique

397

which can cover all that and also can deal with complicated strain fields in

398

structures or structural materials is the Digital Image Correlation. With this

399

technique, strain can be calculated from a series of consecutive images with

400

sub pixel resolution as will be shown in the following chapters. <o:p></o:p>

401

402

<span style='mso-ansi-language:

403

EN-US'><o:p> </o:p>

404

405

<span style='mso-ansi-language:

406

EN-US'>Even though there are tons of codes from the image registration, artificial

407

intelligence or the robotics community, none of them can easily be used by the

408

strain measuring community. Commercial code is available also and has the

409

advantage of getting a guaranty that it works, is nicely designed and has well

410

thought through user interfaces and typically a higher processing speed. The

411

disadvantages are, that commercial software typically has to be paid in k$, is available

412

only as package with hardware, enjoys a notorious lack of programming interfaces

413

or tools to change the code to fit it into a test setup as well as the

414

probability of inaccessible data in case the software license is not valid

415

anymore or it does not run on the new and fancy computer anymore. <o:p></o:p>

416

417

<span style='mso-ansi-language:

418

EN-US'><o:p> </o:p>

419

420

<span style='mso-ansi-language:

421

EN-US'>Out of all these reasons this code was written together with Rob

422

Thompson and Dan Gianola during my stay in the group of Kevin J. Hemker at the <st1:PlaceName

423

w:st="on">Johns</st1:PlaceName> <st1:PlaceName w:st="on">Hopkins</st1:PlaceName>

424

<st1:PlaceType w:st="on">University</st1:PlaceType> in <st1:place w:st="on"><st1:City

425

w:st="on">Baltimore</st1:City>, <st1:State w:st="on">MD</st1:State>, <st1:country-region

426

w:st="on">USA</st1:country-region></st1:place>. This code is not meant to be a

427

direct competitor to commercial code since we have not the time to make it as

428

easy to use as possible but as a different option with the advantages to be �free�,

429

�flexible� and �scalable�. �Free� in terms of free access even though we would like

430

to ask you to cite our code in case you use it and �free� again even though you

431

need to buy matlab together with some toolboxes. Since most research

432

institutions have access to this important tool I think we still can name it

433

�free�. �Flexible� in terms of the relative easy way you can enhance this

434

matlab code as a script language where you can add either other toolboxes or

435

your own code to flex it around your application. We would appreciate it if you

436

as a user could share your own code with all of us out here so we can learn

437

from your creativity. And �scalable� since you can easily start several

438

sessions to process your images on more than one processor (core) and because

439

there is a good chance that we will be able to use Graphic Processing Units

440

(GPU = the graphics processor on a graphics card) or other add-on boards to

441

enhance processing speed in the next few years.<o:p></o:p>

442

443

<span style='mso-ansi-language:

444

EN-US'><o:p> </o:p>

445

446

<span style='mso-ansi-language:

447

EN-US'>In case you are still reading, we would like to wish you fun using this

448

code and hope we were able to provide you with a useful tool to help your with

449

your experiments. <o:p></o:p>

450

451

<span style='mso-ansi-language:

452

EN-US'><o:p> </o:p>

453

454

<span style='mso-ansi-language:

455

EN-US'>Cheers, Chris. <o:p></o:p>

456

457

<span style='mso-ansi-language:

458

EN-US'><o:p> </o:p>

459

460

<st1:country-region w:st="on"><st1:place

461

w:st="on">Germany</st1:place></st1:country-region><span

462

style='mso-ansi-language:EN-US'>, December 2006.<o:p></o:p>

463

464

<span style='mso-ansi-language:

465

EN-US'><o:p> </o:p>

466

467

<span style='font-size:12.0pt;font-family:"Times New Roman";mso-fareast-font-family:

468

"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:DE;mso-bidi-language:

469

AR-SA'>

470

471

472

<span style='font-size:18.0pt;

473

mso-ansi-language:EN-US'>2. Requierements and Installation<o:p></o:p>

474

475

<span style='mso-ansi-language:

476

EN-US'><o:p> </o:p>

477

478

<span style='mso-ansi-language:

479

EN-US'><o:p> </o:p>

480

481

<b style='mso-bidi-font-weight:

482

normal'>REQUIEREMENTS:<o:p></o:p>

483

484

<span style='mso-ansi-language:

485

EN-US'><o:p> </o:p>

486

487

<span style='mso-ansi-language:

488

EN-US'>You will need Matlab 7 (R14) or

489

higher (since the dlmwrite.m in Matlab 6.5 does not work, at least for me

490

and this is a really important function since it stores the data after each

491

calculation step). And you will need the following <b style='mso-bidi-font-weight:

492

normal'>TOOLBOXES:<o:p></o:p>

493

494

<span style='mso-ansi-language:

495

EN-US'><o:p> </o:p>

496

497

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

498

mso-list:l1 level1 lfo3;tab-stops:list .5in'><![if !supportLists]><span

499

style='mso-ansi-language:EN-US'>-<span

500

style='font:7.0pt "Times New Roman"'>         

501

<![endif]><span

502

style='mso-ansi-language:EN-US'>Optimization<span style='mso-ansi-language:

503

EN-US'> (all fitting processes depends on this toolbox)<o:p></o:p>

504

505

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

506

mso-list:l1 level1 lfo3;tab-stops:list .5in'><![if !supportLists]><span

507

style='mso-ansi-language:EN-US'>-<span

508

style='font:7.0pt "Times New Roman"'>         

509

<![endif]><span

510

style='mso-ansi-language:EN-US'>Image processing<span

511

style='mso-ansi-language:EN-US'> (obviously)<o:p></o:p>

512

513

<span style='mso-ansi-language:

514

EN-US'><o:p> </o:p>

515

516

<span style='mso-ansi-language:

517

EN-US'><o:p> </o:p>

518

519

<b style='mso-bidi-font-weight:

520

normal'>INSTALLATION STEP 1:<o:p></o:p>

521

522

<span style='mso-ansi-language:

523

EN-US'><o:p> </o:p>

524

525

<span style='mso-ansi-language:

526

EN-US'>Copy the following essential

527

files into the work folder in your matlab folder (e.g. in windows:

528

c:\matlab65\work):<o:p></o:p>

529

530

<span style='mso-ansi-language:

531

EN-US'><o:p> </o:p>

532

533

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

534

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

535

style='mso-ansi-language:EN-US'>-<span

536

style='font:7.0pt "Times New Roman"'>         

537

<![endif]>filelist_generator.m<span

538

style='mso-tab-count:1'>�� (generates file name lists and an optional time_image

539

<o:p></o:p>

540

541

<p class=MsoNormal style='margin-left:1.75in;text-align:justify;text-indent:

542

15.6pt'>list needed for merging stress

543

and strain)<o:p></o:p>

544

545

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

546

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

547

style='mso-ansi-language:EN-US'>-<span

548

style='font:7.0pt "Times New Roman"'>         

549

<![endif]>grid_generator.m<span

630

<span lang=EN-US

631

style='mso-ansi-language:EN-US'><o:p> </o:p>

632

633

<span lang=EN-US

634

style='mso-ansi-language:EN-US'>Chris Eberl, Robert Thompson, Daniel Gianola,

635

Sven Bundschuh<o:p></o:p>

636

637

<span lang=EN-US

638

style='mso-ansi-language:EN-US'>@ Karlsruhe Institute of Technology, Germany,

639

Group of Chris Eberl<o:p></o:p>

640

641

<span lang=EN-US

642

style='mso-ansi-language:EN-US'>@ Johns Hopkins University, USA, Group of Kevin

643

J. Hemker<o:p></o:p>

644

645

<span lang=EN-US

646

style='mso-ansi-language:EN-US'><o:p> </o:p>

647

648

<span lang=EN-US

649

style='mso-ansi-language:EN-US'>chris.eberl@kit.edu or chris.eberl@jhu.edu<o:p></o:p>

650

651

<span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif";

652

mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:

653

DE;mso-bidi-language:AR-SA'>

654

655

656

<span lang=EN-US

657

style='font-size:18.0pt;mso-ansi-language:EN-US'>1. Introduction<o:p></o:p>

658

659

<span lang=EN-US

660

style='mso-ansi-language:EN-US'><o:p> </o:p>

661

662

<span lang=EN-US

663

style='mso-ansi-language:EN-US'>Measuring strain in samples which are too

664

small, big, compliant, soft or hot are typical scenarios where non-contact

665

techniques are needed. A technique which can cover all that and also can deal

666

with complicated strain fields in structures or structural materials is the

667

Digital Image Correlation. With this technique, strain can be calculated from a

668

series of consecutive images with sub pixel resolution as will be shown in the

669

following chapters. <o:p></o:p>

670

671

<span lang=EN-US

672

style='mso-ansi-language:EN-US'><o:p> </o:p>

673

674

<span lang=EN-US

675

style='mso-ansi-language:EN-US'>Even though there are tons of codes from the

676

image registration, artificial intelligence or the robotics community, none of

677

them can easily be used by the strain measuring community. Commercial code is

678

available also and has the advantage of getting a guaranty that it works, is nicely

679

designed and has well thought through user interfaces and typically a higher

680

processing speed. The disadvantages are, that commercial software typically has

681

to be paid in k$, is available only as package with hardware, enjoys a

682

notorious lack of programming interfaces or tools to change the code to fit it

683

into a test setup as well as the probability of inaccessible data in case the

684

software license is not valid anymore or it does not run on the new and fancy

685

computer anymore. <o:p></o:p>

686

687

<span lang=EN-US

688

style='mso-ansi-language:EN-US'><o:p> </o:p>

689

690

<span lang=EN-US

691

style='mso-ansi-language:EN-US'>Out of all these reasons this code was started together

692

with Rob Thompson and Dan Gianola during my stay in the group of Kevin J.

693

Hemker at the <st1:place w:st="on"><st1:PlaceName w:st="on">Johns</st1:PlaceName>

694

<st1:PlaceName w:st="on">Hopkins</st1:PlaceName> <st1:PlaceType w:st="on">University</st1:PlaceType></st1:place>

695

in <st1:place w:st="on"><st1:City w:st="on">Baltimore</st1:City>, <st1:State

696

w:st="on">MD</st1:State>, <st1:country-region w:st="on">USA</st1:country-region></st1:place>.

697

Considerable extensions and new code as well as all the multi core stuff was

698

added while Chris was heading a group (�microreliability�) at the KIT.<o:p></o:p>

699

700

<span lang=EN-US

701

style='mso-ansi-language:EN-US'>This code is not meant to be a direct competitor

702

to commercial code since we have not the time to make it as easy to use as

703

possible but as a different option with the advantages to be �free�, �flexible�

704

and �scalable�. �Free� in terms of free access even though we would like to ask

705

you to cite our code in case you use it and �free� again even though you need

706

to buy matlab together with some toolboxes. Since most research institutions

707

have access to this important tool I think we still can name it �free�.

708

�Flexible� in terms of the relative easy way you can enhance this matlab code

709

as a script language where you can add either other toolboxes or your own code

710

to flex it around your application. We would appreciate it if you as a user

711

could share your own code with all of us out here so we can learn from your

712

creativity. And �scalable� since you can easily start several sessions to

713

process your images on more than one processor (core) and the newest code

714

segments are already ready to use multicores and because you can also use

715

Graphic Processing Units (GPU = the graphics processor on a graphics card, http://dside.dyndns.org/dict

716

) or other add-on boards to enhance processing speed.<o:p></o:p>

717

718

<span lang=EN-US

719

style='mso-ansi-language:EN-US'><o:p> </o:p>

720

721

<span lang=EN-US

722

style='mso-ansi-language:EN-US'>In case you are still reading, we would like to

723

wish you fun using this code and hope we were able to provide you with a useful

724

tool to help your with your experiments. <o:p></o:p>

725

726

<span lang=EN-US

727

style='mso-ansi-language:EN-US'><o:p> </o:p>

728

729

<span lang=EN-US

730

style='mso-ansi-language:EN-US'>Cheers, Chris. <o:p></o:p>

731

732

<span lang=EN-US

733

style='mso-ansi-language:EN-US'><o:p> </o:p>

734

735

<span lang=EN-US

736

style='mso-ansi-language:EN-US'>Karlsruhe, August 2010.<o:p></o:p>

737

738

<span lang=EN-US

739

style='mso-ansi-language:EN-US'><o:p> </o:p>

740

741

<span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif";

742

mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:

743

DE;mso-bidi-language:AR-SA'>

744

745

746

<span lang=EN-US

747

style='font-size:18.0pt;mso-ansi-language:EN-US'>2. Requirements and

748

Installation<o:p></o:p>

749

750

<span lang=EN-US

751

style='mso-ansi-language:EN-US'><o:p> </o:p>

752

753

<span lang=EN-US

754

style='mso-ansi-language:EN-US'><o:p> </o:p>

755

756

<b style='mso-bidi-font-weight:

757

normal'>REQUIEREMENTS:<o:p></o:p>

758

759

<span lang=EN-US

760

style='mso-ansi-language:EN-US'><o:p> </o:p>

761

762

<span lang=EN-US

763

style='mso-ansi-language:EN-US'>You will need <b style='mso-bidi-font-weight:

764

normal'>Matlab 7 (R14) or higher (since the dlmwrite.m in Matlab 6.5 does

765

not work, at least for me and this is a really important function since it

766

stores the data after each calculation step). And you will need the following <b

767

style='mso-bidi-font-weight:normal'>TOOLBOXES:<o:p></o:p>

768

769

<span lang=EN-US

770

style='mso-ansi-language:EN-US'><o:p> </o:p>

771

772

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

773

-18.0pt;mso-list:l1 level1 lfo3;tab-stops:list 36.0pt'><![if !supportLists]><span

774

lang=EN-US style='mso-ansi-language:EN-US'>-<span

775

style='font:7.0pt "Times New Roman"'>         

776

<![endif]><span

777

lang=EN-US style='mso-ansi-language:EN-US'>Optimization<span

778

lang=EN-US style='mso-ansi-language:EN-US'> (all fitting processes depends on

779

this toolbox)<o:p></o:p>

780

781

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

782

-18.0pt;mso-list:l1 level1 lfo3;tab-stops:list 36.0pt'><![if !supportLists]><span

783

lang=EN-US style='mso-ansi-language:EN-US'>-<span

784

style='font:7.0pt "Times New Roman"'>         

785

<![endif]><span

786

lang=EN-US style='mso-ansi-language:EN-US'>Image processing<span

787

lang=EN-US style='mso-ansi-language:EN-US'> (obviously)<o:p></o:p>

788

789

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

790

-18.0pt;mso-list:l1 level1 lfo3;tab-stops:list 36.0pt'><![if !supportLists]><span

791

lang=EN-US style='mso-ansi-language:EN-US'>-<span

792

style='font:7.0pt "Times New Roman"'>         

793

<![endif]>Optional

794

the Parallel Computing Toolbox (If

795

you want to use multicores)<o:p></o:p>

796

797

<span lang=EN-US

798

style='mso-ansi-language:EN-US'><o:p> </o:p>

799

800

<span lang=EN-US

801

style='mso-ansi-language:EN-US'>You need to download the following .m files

802

from matlab central if you want a full field interpolated strain field

803

visualization:<o:p></o:p>

804

805

<span lang=EN-US

806

style='mso-ansi-language:EN-US'>�surfit.m�, �polyfic.m� and �polyvac.m� from

807

Vassili Pastushenko at the matlab central exchange into your matlab work folder<o:p></o:p>

808

809

<span lang=EN-US

810

style='mso-ansi-language:EN-US'><o:p> </o:p>

811

812

<span lang=EN-US

813

style='mso-ansi-language:EN-US'><o:p> </o:p>

814

815

<b style='mso-bidi-font-weight:

816

normal'>INSTALLATION STEP

817

1:<o:p></o:p>

818

819

<span lang=EN-US

820

style='mso-ansi-language:EN-US'><o:p> </o:p>

821

822

<span lang=EN-US

823

style='mso-ansi-language:EN-US'>Copy the files from the zip file you just

824

downloaded from the mathworks server into the work folder in your matlab folder

825

(e.g. in windows: c:\matlab65\work or into your Matlab folder, in Windows it is

826

found in your Documents section):<o:p></o:p>

827

828

<span lang=EN-US

829

style='mso-ansi-language:EN-US'><o:p> </o:p>

830

831

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

832

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

833

lang=EN-US style='mso-ansi-language:EN-US'>-<span

834

style='font:7.0pt "Times New Roman"'>         

835

<![endif]>filelist_generator.m<span

836

style='mso-tab-count:1'>�� (generates file name lists with max. 8

837

letters and �.tif� at �� the

838

end and creates a time_image list needed for �� merging

839

stress and strain)<o:p></o:p>

840

841

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

842

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

843

lang=EN-US style='mso-ansi-language:EN-US'>-<span

844

style='font:7.0pt "Times New Roman"'>         

845

<![endif]>grid_generator.m<span

550

846

style='mso-tab-count:1'>�� (generates grid rasters needed for the

551

847

correlation code)<o:p></o:p>

552

848

553

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

554

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

555

style='mso-ansi-language:EN-US'>-<span

849

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

850

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

851

lang=EN-US style='mso-ansi-language:EN-US'>-<span

556

852

style='font:7.0pt "Times New Roman"'>         

557

<![endif]>automate_image<span

853

<![endif]>automate_image<span

558

854

style='mso-tab-count:1'>�� (this function does all the hard

559

855

correlation work)<o:p></o:p>

560

856

561

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

562

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

563

style='mso-ansi-language:EN-US'>-<span

857

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

858

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

859

lang=EN-US style='mso-ansi-language:EN-US'>-<span

564

860

style='font:7.0pt "Times New Roman"'>         

565

<![endif]>peak_labelling.m<span

861

<![endif]>peak_labelling.m<span

566

862

style='mso-tab-count:1'>�� (this function is searching and tracking

567

863

peaks)<o:p></o:p>

568

864

569

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

570

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

571

style='mso-ansi-language:EN-US'>-<span

865

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

866

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

867

lang=EN-US style='mso-ansi-language:EN-US'>-<span

572

868

style='font:7.0pt "Times New Roman"'>         

573

<![endif]>pickpeak.m<span

869

<![endif]>pickpeak.m<span

574

870

style='mso-tab-count:2'>�� (this function is tracking

575

871

manually chosen peaks)<o:p></o:p>

576

872

577

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

578

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

579

style='mso-ansi-language:EN-US'>-<span

873

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

874

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

875

lang=EN-US style='mso-ansi-language:EN-US'>-<span

580

876

style='font:7.0pt "Times New Roman"'>         

581

<![endif]>strain_lineprofile.m<span

877

<![endif]>strain_lineprofile.m<span

582

878

style='mso-tab-count:1'>�� (tracking two markers in a lineprofile)<o:p></o:p>

583

879

584

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

585

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

586

style='mso-ansi-language:EN-US'>-<span

880

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

881

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

882

lang=EN-US style='mso-ansi-language:EN-US'>-<span

587

883

style='font:7.0pt "Times New Roman"'>         

588

<![endif]>line_visuals.m<span

589

style='mso-tab-count:2'>�� (needed for the strain_lineprofile.m)<o:p></o:p>

884

<![endif]>line_visuals.m<span

885

style='mso-tab-count:2'>�� (needed for the

886

strain_lineprofile.m)<o:p></o:p>

590

887

591

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

592

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

593

style='mso-ansi-language:EN-US'>-<span

888

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

889

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

890

lang=EN-US style='mso-ansi-language:EN-US'>-<span

594

891

style='font:7.0pt "Times New Roman"'>         

595

<![endif]>sortvalidpoints.m<span

892

<![endif]>sortvalidpoints.m<span

596

893

style='mso-tab-count:1'>�� (this function finds the tracked peaks

597

894

and has to be �� called

598

895

after peak_labelling or pickpeak)<o:p></o:p>

599

896

600

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

601

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

602

style='mso-ansi-language:EN-US'>-<span

897

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

898

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

899

lang=EN-US style='mso-ansi-language:EN-US'>-<span

603

900

style='font:7.0pt "Times New Roman"'>         

604

<![endif]>gauss_onepk.m<span

901

<![endif]>gauss_onepk.m<span

605

902

style='mso-tab-count:1'>�� (the gauss equation called by the

606

903

peaktracking functions)<o:p></o:p>

607

904

608

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

609

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

610

style='mso-ansi-language:EN-US'>-<span

905

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

906

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

907

lang=EN-US style='mso-ansi-language:EN-US'>-<span

611

908

style='font:7.0pt "Times New Roman"'>         

612

<![endif]>gauss_twopk.m<span

909

<![endif]>gauss_twopk.m<span

613

910

style='mso-tab-count:1'>�� (same as gauss_onepk.m but with two

614

911

peaks�)<o:p></o:p>

615

912

616

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

617

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

618

style='mso-ansi-language:EN-US'>-<span

913

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

914

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

915

lang=EN-US style='mso-ansi-language:EN-US'>-<span

619

916

style='font:7.0pt "Times New Roman"'>         

620

<![endif]>displacement.m<span

917

<![endif]>displacement.m<span

621

918

style='mso-tab-count:1'>�� (this function will help you analyzing

622

919

your data)<o:p></o:p>

623

920

624

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

625

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

626

style='mso-ansi-language:EN-US'>-<span

921

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

922

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

923

lang=EN-US style='mso-ansi-language:EN-US'>-<span

627

924

style='font:7.0pt "Times New Roman"'>         

628

<![endif]>linearfit.m<span

925

<![endif]>linearfit.m<span

629

926

style='mso-tab-count:2'>�� (contains the linear

630

927

equation)<o:p></o:p>

631

928

632

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

633

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

634

style='mso-ansi-language:EN-US'>-<span

929

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

930

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

931

lang=EN-US style='mso-ansi-language:EN-US'>-<span

635

932

style='font:7.0pt "Times New Roman"'>         

636

<![endif]>ppselection_func.m<span

933

<![endif]>ppselection_func.m<span

637

934

style='mso-tab-count:1'>�� (this function is needed by displacement.m)<o:p></o:p>

638

935

639

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

640

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

641

style='mso-ansi-language:EN-US'>-<span

642

style='font:7.0pt "Times New Roman"'>         

643

<![endif]>resume_automate_image.m

644

(resume stopped correlation jobs, see Chapt. 6)<o:p></o:p>

645

646

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

647

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

648

style='mso-ansi-language:EN-US'>-<span

649

style='font:7.0pt "Times New Roman"'>         

650

<![endif]>jobskript.m<span

651

style='mso-tab-count:2'>�� (generates a pile of jobs and

652

executes them Chapt. 6)<o:p></o:p>

653

654

<span style='mso-ansi-language:

655

EN-US'><o:p> </o:p>

656

657

<span style='mso-ansi-language:

658

EN-US'><o:p> </o:p>

659

660

<b style='mso-bidi-font-weight:

661

normal'>INSTALLATION STEP 2:<o:p></o:p>

662

663

<span style='mso-ansi-language:

664

EN-US'><o:p> </o:p>

665

666

<span style='mso-ansi-language:

667

EN-US'>In cpcorr.m (type �open cpcorr� at the matlab prompt) you have to change

936

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

937

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

938

lang=EN-US style='mso-ansi-language:EN-US'>-<span

939

style='font:7.0pt "Times New Roman"'>         

940

<![endif]>surfit.m<span

941

style='mso-tab-count:2'>�� <a name="OLE_LINK1">(used

942

for visualization from Vassili Pastushenko)</a><o:p></o:p>

943

944

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

945

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

946

lang=EN-US style='mso-ansi-language:EN-US'>-<span

947

style='font:7.0pt "Times New Roman"'>         

948

<![endif]>polyfic.m<span

949

style='mso-tab-count:2'>�� (used for visualization from

950

Vassili Pastushenko)<o:p></o:p>

951

952

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

953

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

954

lang=EN-US style='mso-ansi-language:EN-US'>-<span

955

style='font:7.0pt "Times New Roman"'>         

956

<![endif]>polyvac.m<span

957

style='mso-tab-count:2'>�� (used for visualization from

958

Vassili Pastushenko)<o:p></o:p>

959

960

<span lang=EN-US

961

style='mso-ansi-language:EN-US'><o:p> </o:p>

962

963

<span lang=EN-US

964

style='mso-ansi-language:EN-US'><o:p> </o:p>

965

966

<span lang=EN-US style='font-size:

967

12.0pt;font-family:"Times New Roman","serif";mso-fareast-font-family:"Times New Roman";

968

mso-ansi-language:EN-US;mso-fareast-language:DE;mso-bidi-language:AR-SA'><br

969

clear=all style='page-break-before:always'>

970

971

972

<b style='mso-bidi-font-weight:

973

normal'>INSTALLATION STEP

974

2:<o:p></o:p>

975

976

<span lang=EN-US

977

style='mso-ansi-language:EN-US'><o:p> </o:p>

978

979

<span lang=EN-US

980

style='mso-ansi-language:EN-US'>In cpcorr.m (type �open cpcorr� at the matlab

981

prompt) you have to change <o:p></o:p>

982

983

<span lang=EN-US

984

style='mso-ansi-language:EN-US'><o:p> </o:p>

985

986

<p class=MsoNormal style='margin-left:18.0pt;text-align:justify;text-indent:

987

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 18.0pt'><![if !supportLists]><span

988

lang=EN-US style='mso-ansi-language:EN-US'>-<span

989

style='font:7.0pt "Times New Roman"'>         

990

<![endif]><span

991

lang=EN-US style='mso-ansi-language:EN-US'>in line 77: <o:p></o:p>

992

993

<b style='mso-bidi-font-weight:

994

normal'><o:p> </o:p>

995

996

<span

997

lang=EN-US style='mso-ansi-language:EN-US'>CORRSIZE = 5; <o:p></o:p>

998

999

<span

1000

lang=EN-US style='mso-ansi-language:EN-US'>�� to:

668

1001

<o:p></o:p>

669

1002

670

<span style='mso-ansi-language:

671

EN-US'><o:p> </o:p>

672

673

<p class=MsoNormal style='margin-left:.25in;text-align:justify;text-indent:

674

-.25in;mso-list:l2 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span

675

style='mso-ansi-language:EN-US'>-<span

676

style='font:7.0pt "Times New Roman"'>         

677

<![endif]><span

678

style='mso-ansi-language:EN-US'>in line 77: <o:p></o:p>

679

680

<b style='mso-bidi-font-weight:

681

normal'><o:p> </o:p>

682

683

<span

684

style='mso-ansi-language:EN-US'>CORRSIZE = 5; <o:p></o:p>

685

686

<span

687

style='mso-ansi-language:EN-US'>�� to: <o:p></o:p>

688

689

<span

690

style='mso-ansi-language:EN-US'>CORRSIZE = 15;<o:p></o:p>

691

692

<span

693

style='mso-ansi-language:EN-US'><o:p> </o:p>

694

695

<i

696

style='mso-bidi-font-style:normal'>(This

697

changes the size of the selected parts of the image which will be correlated

698

from 10x10 pixels to 30x30. Change this to smaller values if you experience

699

slow computational speed or if you use low resolution images. Remember that

700

markers need more than double the space from its centre to the edge of the

701

image, otherwise they cannot be tracked.)<o:p></o:p>

702

703

<span

704

style='mso-ansi-language:EN-US'><o:p> </o:p>

705

706

<p class=MsoNormal style='margin-left:.25in;text-align:justify;text-indent:

707

-.25in;mso-list:l2 level1 lfo2;tab-stops:list .25in'><![if !supportLists]><span

708

style='mso-ansi-language:EN-US'>-<span

709

style='font:7.0pt "Times New Roman"'>         

710

<![endif]><span

711

style='mso-ansi-language:EN-US'>in line 134 and 135:<o:p></o:p>

712

713

<span

714

style='mso-ansi-language:EN-US'><o:p> </o:p>

715

716

<span

717

style='mso-ansi-language:EN-US'>input_fractional_offset = xyinput(icp,:) -

718

round(xyinput(icp,:));<o:p></o:p>

719

720

<span

721

style='mso-ansi-language:EN-US'>base_fractional_offset = xybase_in(icp,:) - round(xybase_in(icp,:));<span

1003

<span

1004

lang=EN-US style='mso-ansi-language:EN-US'>CORRSIZE = 15;<o:p></o:p>

1005

1006

<span

1007

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1008

1009

<i

1010

style='mso-bidi-font-style:normal'><span lang=EN-US style='mso-ansi-language:

1011

EN-US'>(This changes the size of the selected parts of the image which will be

1012

correlated from 10x10 pixels to 30x30. Change this to smaller values if you

1013

experience slow computational speed or if you use low resolution images.

1014

Remember that markers need more than double the space from its centre to the edge

1015

of the image, otherwise they cannot be tracked.)<o:p></o:p>

1016

1017

<span

1018

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1019

1020

<p class=MsoNormal style='margin-left:18.0pt;text-align:justify;text-indent:

1021

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 18.0pt'><![if !supportLists]><span

1022

lang=EN-US style='mso-ansi-language:EN-US'>-<span

1023

style='font:7.0pt "Times New Roman"'>         

1024

<![endif]><span

1025

lang=EN-US style='mso-ansi-language:EN-US'>in line 134 and 135:<o:p></o:p>

1026

1027

<span

1028

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1029

1030

<span

1031

lang=EN-US style='mso-ansi-language:EN-US'>input_fractional_offset =

1032

xyinput(icp,:) - round(xyinput(icp,:));<o:p></o:p>

1033

1034

<span

1035

lang=EN-US style='mso-ansi-language:EN-US'>base_fractional_offset =

1036

xybase_in(icp,:) - round(xybase_in(icp,:));��

1037

<o:p></o:p>

1038

1039

<span

1040

lang=EN-US style='mso-ansi-language:EN-US'>�� to:<o:p></o:p>

1041

1042

<span

1043

lang=EN-US style='mso-ansi-language:EN-US'>input_fractional_offset =

1044

xyinput(icp,:) - round(xyinput(icp,:)*1000)/1000;<o:p></o:p>

1045

1046

<span

1047

lang=EN-US style='mso-ansi-language:EN-US'>base_fractional_offset =

1048

xybase_in(icp,:) - round(xybase_in(icp,:)*1000)/1000;<span

722

1049

style='mso-spacerun:yes'>�� <o:p></o:p>

723

1050

724

<span

725

style='mso-ansi-language:EN-US'>�� to:<o:p></o:p>

726

727

<span

728

style='mso-ansi-language:EN-US'>input_fractional_offset = xyinput(icp,:) -

729

round(xyinput(icp,:)*1000)/1000;<o:p></o:p>

730

731

<span

732

style='mso-ansi-language:EN-US'>base_fractional_offset = xybase_in(icp,:) -

733

round(xybase_in(icp,:)*1000)/1000;�� <o:p></o:p>

734

735

<span style='mso-ansi-language:

736

EN-US'><o:p> </o:p>

737

738

<i

739

style='mso-bidi-font-style:normal'>(This

740

is changing the resolution of the marker positions to 1/1000th

1051

<span lang=EN-US

1052

style='mso-ansi-language:EN-US'><o:p> </o:p>

1053

1054

<i

1055

style='mso-bidi-font-style:normal'><span lang=EN-US style='mso-ansi-language:

1056

EN-US'>(This is changing the resolution of the marker positions to 1/1000th

741

1057

pixel. If you need higher resolution just increase these values)<o:p></o:p>

742

1058

743

<span style='mso-ansi-language:

744

EN-US'><o:p> </o:p>

745

746

<span style='mso-ansi-language:

747

EN-US'><o:p> </o:p>

748

749

<span style='font-size:12.0pt;font-family:"Times New Roman";mso-fareast-font-family:

750

"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:DE;mso-bidi-language:

751

AR-SA'>

1059

<span lang=EN-US

1060

style='mso-ansi-language:EN-US'><o:p> </o:p>

1061

1062

<span lang=EN-US

1063

style='mso-ansi-language:EN-US'><o:p> </o:p>

1064

1065

<span lang=EN-US

1066

style='mso-ansi-language:EN-US'>In findpeak.m (which you will find in the

1067

private functions section off the Image processing Toolbox folder). The easiest

1068

way to get to it is to find it in cpcorr.m in line 115, right click it and go

1069

to open selection. Sometimes you will need to change the property settings so

1070

you can save it as a normal user. You can also start Matlab as an

1071

administrator, change findpeak.m and log in as a user again:<o:p></o:p>

1072

1073

<span lang=EN-US

1074

style='mso-ansi-language:EN-US'><o:p> </o:p>

1075

1076

<span lang=EN-US

1077

style='mso-ansi-language:EN-US'>- line 58 and 59 from:<o:p></o:p>

1078

1079

<span lang=EN-US

1080

style='mso-ansi-language:EN-US'>�� x_offset

1081

= round(10*x_offset)/10;<o:p></o:p>

1082

1083

<span lang=EN-US

1084

style='mso-ansi-language:EN-US'>��

1085

y_offset = round(10*y_offset)/10;��

1086

<o:p></o:p>

1087

1088

<span lang=EN-US

1089

style='mso-ansi-language:EN-US'><o:p> </o:p>

1090

1091

<span lang=EN-US

1092

style='mso-ansi-language:EN-US'>to<o:p></o:p>

1093

1094

<span lang=EN-US

1095

style='mso-ansi-language:EN-US'>��

1096

x_offset = round(1000*x_offset)/1000;<o:p></o:p>

1097

1098

<span lang=EN-US

1099

style='mso-ansi-language:EN-US'>��

1100

y_offset = round(1000*y_offset)/1000;��

1101

<o:p></o:p>

1102

1103

<span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif";

1104

mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:

1105

DE;mso-bidi-language:AR-SA'>

752

1106

753

1107

754

<span style='font-size:18.0pt;

755

mso-ansi-language:EN-US'>3. Good things to know about matlab:<o:p></o:p>

756

757

<span style='mso-ansi-language:

758

EN-US'><o:p> </o:p>

759

760

<span style='mso-ansi-language:

761

EN-US'>The matlab help is extremely helpful and should be the very first location

762

you look in case of errors. If you never worked with matlab but would like to

763

check it out, the �Getting Started� is a good point to start with. I started

764

there in summer 2005. <o:p></o:p>

765

766

<span style='mso-ansi-language:

767

EN-US'><o:p> </o:p>

768

769

<b style='mso-bidi-font-weight:

770

normal'>TAB:<o:p></o:p>

771

772

<span style='mso-ansi-language:

773

EN-US'>Pressing the TAB key on your keyboard after you started typing in a

774

command at the command line of matlab will show you all functions with the same

775

first letters.<o:p></o:p>

776

777

<span style='mso-ansi-language:

778

EN-US'><o:p> </o:p>

779

780

<b style='mso-bidi-font-weight:

781

normal'>Arrow up function:<o:p></o:p>

782

783

<span style='mso-ansi-language:

784

EN-US'>Pressing the Arrow Up key on your keyboard after you started typing a

785

command will show the last command

786

you started with the same first letters.<o:p></o:p>

787

788

<span style='mso-ansi-language:

789

EN-US'><o:p> </o:p>

790

791

<b style='mso-bidi-font-weight:

792

normal'>Current Folder:<o:p></o:p>

793

794

<span style='mso-ansi-language:

795

EN-US'>The �Current Folder� of matlab is the folder on your harddisk which is

796

currently selected to process data in matlab (close to the upper edge of the

797

matlab window). Functions like �automate_image.m� require certain files to be

798

present in the �Current Folder� otherwise they will produce an error (see

799

description later on). Pressing the little button on the right hand side with

800

the three little dots on it will let you select another folder. Another

801

possibility is to use the command window (see matlab help) or you can select

802

the current directory if it is activated under �View� in that extra window.<o:p></o:p>

803

804

<span style='mso-ansi-language:

805

EN-US'><o:p> </o:p>

806

807

<b style='mso-bidi-font-weight:

808

normal'>Set semicolon:<o:p></o:p>

809

810

<span style='mso-ansi-language:

811

EN-US'>Set the semicolon after calling a function (e.g. �automate_image;�),

812

otherwise all data which you get back from a called function will be plotted in

813

the command window.<o:p></o:p>

814

815

<span style='mso-ansi-language:

816

EN-US'><o:p> </o:p>

817

818

<b style='mso-bidi-font-weight:

819

normal'>Workspace:<o:p></o:p>

820

821

<span style='mso-ansi-language:

822

EN-US'>The Workspace is the place where you can load all your data into.

823

Functions called by you will write their values into the workspace and scripts

824

will use the workspace all the time and leave a mess of variables in there. If

825

you do not know what is going on check out the �Getting Started� paragraph in

826

the matlab help. <o:p></o:p>

827

828

<span style='mso-ansi-language:

829

EN-US'><o:p> </o:p>

830

831

<b style='mso-bidi-font-weight:

832

normal'>How to load data?<o:p></o:p>

833

834

<span style='mso-ansi-language:

835

EN-US'>If you have loaded data into the workspace (either by choosing �File� <span

836

style='font-family:Wingdings;mso-ascii-font-family:"Times New Roman";

837

mso-hansi-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-char-type:

838

symbol;mso-symbol-font-family:Wingdings'><span style='mso-char-type:symbol;

839

mso-symbol-font-family:Wingdings'>�<span style='mso-ansi-language:

840

EN-US'> �Open�� and selected the data file you wanted to load or using the

841

command window e.g. by typing: �load('filenamelist')� and filenamelist is

842

present in the Current Directory) the data will appear in the workspace window.<o:p></o:p>

843

844

<span style='mso-ansi-language:

845

EN-US'><o:p> </o:p>

846

847

<b style='mso-bidi-font-weight:

848

normal'>How to saved data from Workspace

849

to the hard disk?<o:p></o:p>

850

851

<span style='mso-ansi-language:

852

EN-US'>If you want to save data from the workspace to the hard disk, right

853

click on it and select �Save Selection As��. It will save the data with the

854

matlab file fomat. This data is only accessible by matlab. If you want to

855

process the data also with other programs you should consider to save the data

856

as ASCII file. Therefore type in the matlab console window �save('stress.txt','alltemp','-ASCII');�

1108

<span lang=EN-US

1109

style='font-size:18.0pt;mso-ansi-language:EN-US'>3. Good things to know about

1110

matlab:<o:p></o:p>

1111

1112

<span lang=EN-US

1113

style='mso-ansi-language:EN-US'><o:p> </o:p>

1114

1115

<span lang=EN-US

1116

style='mso-ansi-language:EN-US'>The matlab help is extremely helpful and should

1117

be the very first location you look in case of errors. If you never worked with

1118

matlab but would like to check it out, the �Getting Started� is a good point to

1119

start with. I started there in summer 2005. <o:p></o:p>

1120

1121

<span lang=EN-US

1122

style='mso-ansi-language:EN-US'><o:p> </o:p>

1123

1124

<b style='mso-bidi-font-weight:

1125

normal'>TAB:<o:p></o:p>

1126

1127

<span lang=EN-US

1128

style='mso-ansi-language:EN-US'>Pressing the TAB key on your keyboard after you

1129

started typing in a command at the command line of matlab will show you all

1130

functions with the same first letters.<o:p></o:p>

1131

1132

<span lang=EN-US

1133

style='mso-ansi-language:EN-US'><o:p> </o:p>

1134

1135

<b style='mso-bidi-font-weight:

1136

normal'>Arrow up function:<o:p></o:p>

1137

1138

<span lang=EN-US

1139

style='mso-ansi-language:EN-US'>Pressing the Arrow Up key on your keyboard

1140

after you started typing a command will show the <b style='mso-bidi-font-weight:

1141

normal'>last command you started with the same first letters.<o:p></o:p>

1142

1143

<span lang=EN-US

1144

style='mso-ansi-language:EN-US'><o:p> </o:p>

1145

1146

<b style='mso-bidi-font-weight:

1147

normal'>Current Folder:<o:p></o:p>

1148

1149

<span lang=EN-US

1150

style='mso-ansi-language:EN-US'>The �Current Folder� of matlab is the folder on

1151

your harddisk which is currently selected to process data in matlab (close to

1152

the upper edge of the matlab window). Functions like �automate_image.m� require

1153

certain files to be present in the �Current Folder� otherwise they will produce

1154

an error (see description later on). Pressing the little button on the right

1155

hand side with the three little dots on it will let you select another folder.

1156

Another possibility is to use the command window (see matlab help) or you can

1157

select the current directory if it is activated under �View� in that extra

1158

window.<o:p></o:p>

1159

1160

<span lang=EN-US

1161

style='mso-ansi-language:EN-US'><o:p> </o:p>

1162

1163

<b style='mso-bidi-font-weight:

1164

normal'>Set semicolon:<o:p></o:p>

1165

1166

<span lang=EN-US

1167

style='mso-ansi-language:EN-US'>Set the semicolon after calling a function

1168

(e.g. �automate_image;�), otherwise all data which you get back from a called

1169

function will be plotted in the command window.<o:p></o:p>

1170

1171

<span lang=EN-US

1172

style='mso-ansi-language:EN-US'><o:p> </o:p>

1173

1174

<b style='mso-bidi-font-weight:

1175

normal'>Workspace:<o:p></o:p>

1176

1177

<span lang=EN-US

1178

style='mso-ansi-language:EN-US'>The Workspace is the place where you can load

1179

all your data into. Functions called by you will write their values into the

1180

workspace and scripts will use the workspace all the time and leave a mess of

1181

variables in there. If you do not know what is going on check out the �Getting

1182

Started� paragraph in the matlab help. <o:p></o:p>

1183

1184

<span lang=EN-US

1185

style='mso-ansi-language:EN-US'><o:p> </o:p>

1186

1187

<b style='mso-bidi-font-weight:

1188

normal'>How to load data?<o:p></o:p>

1189

1190

<span lang=EN-US

1191

style='mso-ansi-language:EN-US'>If you have loaded data into the workspace

1192

(either by choosing �File� <span lang=EN-US style='font-family:Wingdings;

1193

mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman";

1194

mso-ansi-language:EN-US;mso-char-type:symbol;mso-symbol-font-family:Wingdings'><span

1195

style='mso-char-type:symbol;mso-symbol-font-family:Wingdings'>�<span

1196

lang=EN-US style='mso-ansi-language:EN-US'> �Open�� and selected the data file

1197

you wanted to load or using the command window e.g. by typing: �load('filenamelist')�

1198

and filenamelist is present in the Current Directory) the data will appear in

1199

the workspace window.<o:p></o:p>

1200

1201

<span lang=EN-US

1202

style='mso-ansi-language:EN-US'><o:p> </o:p>

1203

1204

<b style='mso-bidi-font-weight:

1205

normal'>How to saved data from

1206

Workspace to the hard disk?<o:p></o:p>

1207

1208

<span lang=EN-US

1209

style='mso-ansi-language:EN-US'>If you want to save data from the workspace to

1210

the hard disk, right click on it and select �Save Selection As��. It will save

1211

the data with the matlab file fomat. This data is only accessible by matlab. If

1212

you want to process the data also with other programs you should consider to

1213

save the data as ASCII file. Therefore type in the matlab console window �save('stress.txt','alltemp','-ASCII');�

857

1214

to save the variable alltemp as text file�

858

1215

with the name �stress.txt� to the �Current directory�.<span

859

1216

style='mso-spacerun:yes'>� If you want to open it with matlab or excel

860

1217

you have to import the file. The delimiter is per default TAB but can also be

861

1218

chosen to be comma or space (see matlab help).<o:p></o:p>

862

1219

863

<span style='mso-ansi-language:

864

EN-US'><o:p> </o:p>

865

866

<b style='mso-bidi-font-weight:

867

normal'>How to give data in the workspace

868

to the functions?<o:p></o:p>

869

870

<span style='mso-ansi-language:

871

EN-US'>If you type �displacement;� into the command window of matlab, the

872

function will start and ask you for the needed files. Instead you can load the

873

data (e.g. validx.mat and validy.mat) into the workspace and then give it to

874

the displacement function by typing: �displacement(validx,validy);�. If have

875

not loaded validx.mat there will be an error message. <o:p></o:p>

876

877

<span style='mso-ansi-language:

878

EN-US'><o:p> </o:p>

879

880

<b style='mso-bidi-font-weight:

881

normal'>How do I get the data from the

882

function into the workspace?<o:p></o:p>

883

884

<span style='mso-ansi-language:

885

EN-US'>If you type �[validx,validy]=displacement;� the variables validx and validy

886

will be created after running �displacement.m�. If you have manipulated validx

887

and validy (e.g. if you cleaned up the data set from miss-tracked markers) you should

888

save them.<o:p></o:p>

889

890

<span style='mso-ansi-language:

891

EN-US'><o:p> </o:p>

892

893

<b style='mso-bidi-font-weight:

894

normal'>Why are all images<span

895

style='mso-spacerun:yes'>� opened in matlab mirrored to the horizontal center

896

axis of the image?<o:p></o:p>

897

898

<span style='mso-ansi-language:

899

EN-US'>Matlab reads in images like a diagram. Therefore pixel (1,1) is in the

900

lower left while image processing software starts at the upper left corner. <o:p></o:p>

901

902

<span style='mso-ansi-language:

903

EN-US'><o:p> </o:p>

904

905

<b style='mso-bidi-font-weight:

906

normal'>How o stop a function in matlab?<span

907

style='mso-ansi-language:EN-US'><o:p></o:p>

908

909

<span style='mso-ansi-language:

910

EN-US'>To stop a function press the control key (�Crtl�) together with �c�.<o:p></o:p>

911

912

<span style='font-size:12.0pt;font-family:"Times New Roman";mso-fareast-font-family:

913

"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:DE;mso-bidi-language:

914

AR-SA'>

1220

<span lang=EN-US

1221

style='mso-ansi-language:EN-US'><o:p> </o:p>

1222

1223

<b style='mso-bidi-font-weight:

1224

normal'>How to give data in

1225

the workspace to the functions?<o:p></o:p>

1226

1227

<span lang=EN-US

1228

style='mso-ansi-language:EN-US'>If you type �displacement;� into the command

1229

window of matlab, the function will start and ask you for the needed files.

1230

Instead you can load the data (e.g. validx.mat and validy.mat) into the

1231

workspace and then give it to the displacement function by typing:

1232

�displacement(validx,validy);�. If have not loaded validx.mat there will be an

1233

error message. <o:p></o:p>

1234

1235

<span lang=EN-US

1236

style='mso-ansi-language:EN-US'><o:p> </o:p>

1237

1238

<b style='mso-bidi-font-weight:

1239

normal'>How do I get the data

1240

from the function into the workspace?<o:p></o:p>

1241

1242

<span lang=EN-US

1243

style='mso-ansi-language:EN-US'>If you type �[validx,validy]=displacement;� the

1244

variables validx and validy will be created after running �displacement.m�. If

1245

you have manipulated validx and validy (e.g. if you cleaned up the data set

1246

from miss-tracked markers) you should save them.<o:p></o:p>

1247

1248

<span lang=EN-US

1249

style='mso-ansi-language:EN-US'><o:p> </o:p>

1250

1251

<b style='mso-bidi-font-weight:

1252

normal'>Why are all

1253

images� opened in matlab mirrored to the horizontal

1254

center axis of the image?<span lang=EN-US style='mso-ansi-language:

1255

EN-US'><o:p></o:p>

1256

1257

<span lang=EN-US

1258

style='mso-ansi-language:EN-US'>Matlab reads in images like a diagram.

1259

Therefore pixel (1,1) is in the lower left while image processing software

1260

starts at the upper left corner. <o:p></o:p>

1261

1262

<span lang=EN-US

1263

style='mso-ansi-language:EN-US'><o:p> </o:p>

1264

1265

<b style='mso-bidi-font-weight:

1266

normal'>How o stop a function

1267

in matlab?<o:p></o:p>

1268

1269

<span lang=EN-US

1270

style='mso-ansi-language:EN-US'>To stop a function press the control key

1271

(�Crtl�) together with �c�.<o:p></o:p>

1272

1273

<span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif";

1274

mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:

1275

DE;mso-bidi-language:AR-SA'>

915

1276

916

1277

917

<span style='font-size:18.0pt;

918

mso-ansi-language:EN-US'>4. Digital Image Correlation Quick Guide<o:p></o:p>

919

920

<span style='mso-ansi-language:

921

EN-US'><o:p> </o:p>

922

923

<span style='mso-ansi-language:

924

EN-US'>This guide should help you to perform a simple and fast analysis of your

925

images. Before we start you should check your image format and the naming of

926

your files. The preferred image format is *.tif and can be compressed with the

927

packbits compression. JPEG or other image formats as well as MPEG video

928

compression formats will not provide you with sub pixel resolution since the

929

images are processed to save as much space as possible. <o:p></o:p>

930

931

<span style='mso-ansi-language:

932

EN-US'>The script we use to create a list of images to process

933

(filelist_generator.m) is kind of limited to a certain format but it is

1278

<span lang=EN-US

1279

style='font-size:18.0pt;mso-ansi-language:EN-US'>4. Digital Image

1280

Correlation Quick Guide<o:p></o:p>

1281

1282

<span lang=EN-US

1283

style='mso-ansi-language:EN-US'><o:p> </o:p>

1284

1285

<span lang=EN-US

1286

style='mso-ansi-language:EN-US'>This guide should help you to perform a simple

1287

and fast analysis of your images. Before we start you should check your image

1288

format and the naming of your files. The preferred image format is *.tif and

1289

can be compressed with the packbits compression. JPEG or other image formats as

1290

well as MPEG video compression formats will not provide you with sub pixel

1291

resolution since the images are processed to save as much space as possible. <o:p></o:p>

1292

1293

<span lang=EN-US

1294

style='mso-ansi-language:EN-US'>The script we use to create a list of images to

1295

process (filelist_generator.m) is kind of limited to a certain format but it is

934

1296

possible to generate your own list of images. If you want to change the format

935

1297

or the names of your images you can use free programs like Irfanview (<a

936

1298

href="http://www.irfanview.com/">www.irfanview.com</a>) to batch process a huge

937

1299

number of images.<o:p></o:p>

938

1300

939

<span style='mso-ansi-language:

940

EN-US'><o:p> </o:p>

1301

<span lang=EN-US

1302

style='mso-ansi-language:EN-US'><o:p> </o:p>

941

1303

942

1304

<i style='mso-bidi-font-style:

943

normal'>4 Steps to

944

Success:<o:p></o:p>

945

946

<span style='mso-ansi-language:

947

EN-US'><o:p> </o:p>

948

949

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

950

mso-list:l0 level1 lfo1;tab-stops:list .5in'><![if !supportLists]><span

951

style='font-size:16.0pt;mso-ansi-language:EN-US'>1.<span

952

style='font:7.0pt "Times New Roman"'>    <![endif]><span

953

style='font-size:16.0pt;mso-ansi-language:EN-US'>Step: Filename list generation

954

with filelist_generator.m<o:p></o:p>

955

956

<span

957

style='mso-ansi-language:EN-US'><o:p> </o:p>

958

959

<span

960

style='mso-ansi-language:EN-US'>Just type �filelist_generator;� and press

961

�ENTER� at the command line of matlab. <o:p></o:p>

962

963

<span

964

style='mso-ansi-language:EN-US'>There are two ways to proceed now: Either you

965

choose to �manually� type in the image numbers you want to be processed or you

966

can �automatically� generate a list of images by just pointing out the first

967

image and the function will find all images with increasing number before the

968

point in the name (e.g. �PIC00001.Tif�). If you choose �manually�, the

969

following window should appear:<o:p></o:p>

970

971

<span

972

style='mso-ansi-language:EN-US'><o:p> </o:p>

973

974

<span

975

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shapetype id="_x0000_t75"

976

coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe"

977

filled="f" stroked="f">

1305

normal'>4

1306

Steps to Success:<o:p></o:p>

1307

1308

<span lang=EN-US

1309

style='mso-ansi-language:EN-US'><o:p> </o:p>

1310

1311

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

1312

-18.0pt;mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'><![if !supportLists]><span

1313

lang=EN-US style='font-size:16.0pt;mso-ansi-language:EN-US'><span

1314

style='mso-list:Ignore'>1.

1315

<![endif]><span lang=EN-US style='font-size:16.0pt;

1316

mso-ansi-language:EN-US'>Step: Filename list generation with

1317

filelist_generator.m<o:p></o:p>

1318

1319

<span

1320

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1321

1322

<span

1323

lang=EN-US style='mso-ansi-language:EN-US'>Just type �filelist_generator;� and

1324

press �ENTER� at the command line of matlab. The following window should

1325

appear:<o:p></o:p>

1326

1327

<span

1328

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1329

1330

<span

1331

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shapetype

1332

id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t"

1333

path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f">

978

1334

<v:stroke joinstyle="miter"/>

979

1335

<v:formulas>

980

1336

<v:f eqn="if lineDrawn pixelLineWidth 0"/>

992

1348

</v:formulas>

993

1349

<v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"/>

994

1350

<o:lock v:ext="edit" aspectratio="t"/>

995

</v:shapetype><v:shape id="_x0000_i1025" type="#_x0000_t75" style='width:243pt;

996

height:102.75pt'>

997

<v:imagedata src="Correlation_Guide_2_files/image001.jpg" o:title="filelist_generator"

998

cropbottom="43901f" cropright="27208f"/>

1351

</v:shapetype><v:shape id="_x0000_i1025" type="#_x0000_t75" style='width:189.75pt;

1352

height:138.75pt'>

1353

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image001.png"

1354

o:title=""/>

1355

</v:shape><![endif]--><![if !vml]><img border=0 width=253 height=185

1356

src="Correlation_Tracking_Guide_2010-Dateien/image002.jpg" v:shapes="_x0000_i1025"><![endif]><o:p></o:p>

1357

1358

<span

1359

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1360

1361

<span

1362

lang=EN-US style='mso-ansi-language:EN-US'>If you select automatically, the

1363

following menu will ask you for the first image you would like to process:<o:p></o:p>

1364

1365

<span

1366

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1026"

1367

type="#_x0000_t75" style='width:414.75pt;height:307.5pt'>

1368

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image003.png"

1369

o:title=""/>

1370

</v:shape><![endif]--><![if !vml]><img border=0 width=553 height=410

1371

src="Correlation_Tracking_Guide_2010-Dateien/image004.jpg" v:shapes="_x0000_i1026"><![endif]><o:p></o:p>

1372

1373

<span

1374

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1375

1376

<span

1377

lang=EN-US style='mso-ansi-language:EN-US'>Here you can select e.g.

1378

PIC0001.tif. You will be asked to save the file, please do not change the name

1379

of the filename list as automate_image and other tools will need it. You should

1380

also save the file in the folder where your images are. After that you will be

1381

asked if you want to read out the time from the images:<o:p></o:p>

1382

1383

<span

1384

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1385

1386

<span

1387

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1027"

1388

type="#_x0000_t75" style='width:308.25pt;height:111.75pt'>

1389

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image005.png"

1390

o:title=""/>

1391

</v:shape><![endif]--><![if !vml]><img border=0 width=411 height=149

1392

src="Correlation_Tracking_Guide_2010-Dateien/image006.jpg" v:shapes="_x0000_i1027"><![endif]><o:p></o:p>

1393

1394

<span lang=EN-US

1395

style='mso-ansi-language:EN-US'><o:p> </o:p>

1396

1397

<span

1398

lang=EN-US style='mso-ansi-language:EN-US'>If you answer yes Matlab can read

1399

the acquisition time from your images. As the information is gathered fro the

1400

EXIF data the time resolution is limited to 1 second.<o:p></o:p>

1401

1402

<span

1403

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1404

1405

<span

1406

lang=EN-US style='mso-ansi-language:EN-US'>If you chose to use manual you will

1407

find a different window:<o:p></o:p>

1408

1409

<span

1410

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1411

1412

<span

1413

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1028"

1414

type="#_x0000_t75" style='width:243pt;height:102.75pt'>

1415

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image007.jpg"

1416

o:title="filelist_generator"/>

999

1417

</v:shape><![endif]--><![if !vml]><img border=0 width=324 height=137

1000

src="Correlation_Guide_2_files/image002.jpg" v:shapes="_x0000_i1025"><![endif]><o:p></o:p>

1001

1002

<span

1003

style='mso-ansi-language:EN-US'><o:p> </o:p>

1004

1005

<span style='mso-ansi-language:

1006

EN-US'>Fig. 1: Input of first and last image to create an image list with

1007

filelist_generator.m<o:p></o:p>

1008

1009

<span

1010

style='mso-ansi-language:EN-US'><o:p> </o:p>

1011

1012

<span

1013

style='mso-ansi-language:EN-US'>The numbers will be the number at the end of

1014

each filename. After depositing these numbers in the dialog the next window

1015

will ask for the first 4 letters of the filenames.<o:p></o:p>

1016

1017

<span

1018

style='mso-ansi-language:EN-US'><o:p> </o:p>

1019

1020

<span

1021

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1026"

1418

src="Correlation_Tracking_Guide_2010-Dateien/image007.jpg" v:shapes="_x0000_i1028"><![endif]><o:p></o:p>

1419

1420

<span

1421

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1422

1423

<span lang=EN-US

1424

style='mso-ansi-language:EN-US'>Fig. 1: Input of first and last image to create

1425

an image list with filelist_generator.m<o:p></o:p>

1426

1427

<span

1428

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1429

1430

<span

1431

lang=EN-US style='mso-ansi-language:EN-US'>The numbers will be the number at

1432

the end of each filename. After depositing these numbers in the dialog the next

1433

window will ask for the first 4 letters of the filenames.<o:p></o:p>

1434

1435

<span

1436

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1437

1438

<span

1439

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1029"

1022

1440

type="#_x0000_t75" style='width:243pt;height:1in'>

1023

<v:imagedata src="Correlation_Guide_2_files/image003.jpg" o:title="filelist_generator_2"

1024

cropbottom="50376f" cropright="27208f"/>

1441

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image008.jpg"

1442

o:title="filelist_generator_2"/>

1025

1443

</v:shape><![endif]--><![if !vml]><img border=0 width=324 height=96

1026

src="Correlation_Guide_2_files/image004.jpg" v:shapes="_x0000_i1026"><![endif]><o:p></o:p>

1027

1028

<span

1029

style='mso-ansi-language:EN-US'><o:p> </o:p>

1030

1031

<span style='mso-ansi-language:

1032

EN-US'>Fig. 2: Input for the first 4 letters in filelist_generator.m<o:p></o:p>

1033

1034

<span

1035

style='mso-ansi-language:EN-US'><o:p> </o:p>

1036

1037

<span

1038

style='mso-ansi-language:EN-US'>The next step is to save the file name list

1039

into the folder with the images to process. You should choose to use

1040

�filenamelist.mat� since this is what the following scripts will search for. <o:p></o:p>

1041

1042

<span

1043

style='mso-ansi-language:EN-US'><o:p> </o:p>

1044

1045

<span

1046

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1027"

1444

src="Correlation_Tracking_Guide_2010-Dateien/image008.jpg" v:shapes="_x0000_i1029"><![endif]><o:p></o:p>

1445

1446

<span

1447

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1448

1449

<span lang=EN-US

1450

style='mso-ansi-language:EN-US'>Fig. 2: Input for the first 4 letters in

1451

filelist_generator.m<o:p></o:p>

1452

1453

<span

1454

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1455

1456

<span

1457

lang=EN-US style='mso-ansi-language:EN-US'>The next step is to save the file

1458

name list into the folder with the images to process.<o:p></o:p>

1459

1460

<span

1461

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1030"

1047

1462

type="#_x0000_t75" style='width:252pt;height:162pt'>

1048

<v:imagedata src="Correlation_Guide_2_files/image005.jpg" o:title="filelist_generator_3"

1049

cropbottom="31426f" cropright="25789f"/>

1463

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image009.jpg"

1464

o:title="filelist_generator_3"/>

1050

1465

</v:shape><![endif]--><![if !vml]><img border=0 width=336 height=216

1051

src="Correlation_Guide_2_files/image006.jpg" v:shapes="_x0000_i1027"><![endif]><o:p></o:p>

1052

1053

<span

1054

style='mso-ansi-language:EN-US'><o:p> </o:p>

1055

1056

<span style='mso-ansi-language:

1057

EN-US'>Fig. 3: Dialog to save the file name list into the folder with the

1058

images to analyze.<o:p></o:p>

1059

1060

<span

1061

style='mso-ansi-language:EN-US'><o:p> </o:p>

1062

1063

<span

1064

style='mso-ansi-language:EN-US'><o:p> </o:p>

1065

1066

<span

1067

style='mso-ansi-language:EN-US'><o:p> </o:p>

1068

1069

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

1070

mso-list:l0 level1 lfo1;tab-stops:list .5in'><![if !supportLists]><span

1071

style='font-size:16.0pt;mso-ansi-language:EN-US'>2.<span

1072

style='font:7.0pt "Times New Roman"'>    <![endif]><span

1073

style='font-size:16.0pt;mso-ansi-language:EN-US'>Grid generation with grid_generator.m

1074

for correlation:<o:p></o:p>

1075

1076

<span

1077

style='mso-ansi-language:EN-US'><o:p> </o:p>

1078

1079

<span

1080

style='mso-ansi-language:EN-US'>It has to be noted that the user can always

1081

generate his own marker positions. Therefore the marker position in pixel has

1082

to be saved as a text based format where the x-position is saved as

1466

src="Correlation_Tracking_Guide_2010-Dateien/image009.jpg" v:shapes="_x0000_i1030"><![endif]><o:p></o:p>

1467

1468

<span

1469

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1470

1471

<span lang=EN-US

1472

style='mso-ansi-language:EN-US'>Fig. 3: Dialog to save the file name list into

1473

the folder with the images to analyze.<o:p></o:p>

1474

1475

<span

1476

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1477

1478

<span

1479

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1480

1481

<span

1482

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1483

1484

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

1485

-18.0pt;mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'><![if !supportLists]><span

1486

lang=EN-US style='font-size:16.0pt;mso-ansi-language:EN-US'><span

1487

style='mso-list:Ignore'>2.

1488

<![endif]><span lang=EN-US style='font-size:16.0pt;

1489

mso-ansi-language:EN-US'>Grid generation with grid_generator.m for correlation:<o:p></o:p>

1490

1491

<span

1492

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1493

1494

<span

1495

lang=EN-US style='mso-ansi-language:EN-US'>It has to be noted that the user can

1496

always generate his own marker positions. Therefore the marker position in

1497

pixel has to be saved as a text based format where the x-position is saved as

1083

1498

�grid_x.dat� and the y-position saved as �grid_y.dat�. <o:p></o:p>

1084

1499

1085

<span

1086

style='mso-ansi-language:EN-US'>To start just type �grid_generator;� and press

1087

�ENTER� at the command line of matlab. The following window should appear:<o:p></o:p>

1088

1089

<span

1090

style='mso-ansi-language:EN-US'><o:p> </o:p>

1091

1092

<span

1093

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1028"

1094

type="#_x0000_t75" style='width:252pt;height:164.25pt'>

1095

<v:imagedata src="Correlation_Guide_2_files/image007.jpg" o:title="grid_generator_1"

1096

cropbottom="30952f" cropright="25789f"/>

1097

</v:shape><![endif]--><![if !vml]><img border=0 width=336 height=219

1098

src="Correlation_Guide_2_files/image008.jpg" v:shapes="_x0000_i1028"><![endif]><o:p></o:p>

1099

1100

<span

1101

style='mso-ansi-language:EN-US'><o:p> </o:p>

1102

1103

<span style='mso-ansi-language:

1104

EN-US'>Fig. 4: Dialog to open the first (base) image to generate a grid<o:p></o:p>

1105

1106

<span

1107

style='mso-ansi-language:EN-US'><o:p> </o:p>

1108

1109

<span

1110

style='mso-ansi-language:EN-US'>In this dialog the first (base) image can be

1111

selected in which the grid can be created. After selecting this base image, the

1112

image will be opened and a new dialog pops up to ask you what kind of grid

1113

should be used.<o:p></o:p>

1114

1115

<span

1116

style='mso-ansi-language:EN-US'><o:p> </o:p>

1117

1118

<span

1119

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1030"

1120

type="#_x0000_t75" style='width:279pt;height:135pt'>

1121

<v:imagedata src="Correlation_Guide_2_files/image009.jpg" o:title="grid_generator_3"/>

1122

</v:shape><![endif]--><![if !vml]><img border=0 width=372 height=180

1123

src="Correlation_Guide_2_files/image010.jpg" v:shapes="_x0000_i1030"><![endif]><!--[if gte vml 1]><v:shape

1124

id="_x0000_i1031" type="#_x0000_t75" style='width:99pt;height:132.75pt'>

1125

<v:imagedata src="Correlation_Guide_2_files/image011.jpg" o:title="grid_generator_2"

1126

cropbottom="31426f" cropright="46490f"/>

1127

</v:shape><![endif]--><![if !vml]><img border=0 width=132 height=177

1128

src="Correlation_Guide_2_files/image012.jpg" v:shapes="_x0000_i1031"><![endif]><o:p></o:p>

1129

1130

<span

1131

style='mso-ansi-language:EN-US'><o:p> </o:p>

1132

1133

<span style='mso-ansi-language:

1134

EN-US'>Fig. 5: The opened base image and the menu to select the grid type.<o:p></o:p>

1135

1136

<span

1137

style='mso-ansi-language:EN-US'><o:p> </o:p>

1138

1139

<span

1140

style='mso-ansi-language:EN-US'>The different types are a rectangular or

1141

circular grid, two markers, a line or two rectangles of markers. If you choose a

1500

<span

1501

lang=EN-US style='mso-ansi-language:EN-US'>To start just type �grid_generator;�

1502

and press �ENTER� at the command line of matlab. The following window should

1503

appear:<o:p></o:p>

1504

1505

<span

1506

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1507

1508

<span

1509

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1031"

1510

type="#_x0000_t75" style='width:414.75pt;height:307.5pt'>

1511

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image010.png"

1512

o:title=""/>

1513

</v:shape><![endif]--><![if !vml]><img border=0 width=553 height=410

1514

src="Correlation_Tracking_Guide_2010-Dateien/image011.jpg" v:shapes="_x0000_i1031"><![endif]><o:p></o:p>

1515

1516

<span

1517

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1518

1519

<span lang=EN-US

1520

style='mso-ansi-language:EN-US'>Fig. 4: Dialog to open the first (base) image

1521

to generate a grid<o:p></o:p>

1522

1523

<span

1524

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1525

1526

<span

1527

lang=EN-US style='mso-ansi-language:EN-US'>In this dialog the first (base)

1528

image can be selected in which the grid can be created. After selecting this

1529

base image, the image will be opened and a new dialog pops up to ask you if you

1530

would like to load an existing grid. If you want to create a new one just hit

1531

No and go ahead.<o:p></o:p>

1532

1533

<span

1534

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1535

1536

<span

1537

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1538

1539

<span

1540

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1032"

1541

type="#_x0000_t75" style='width:414.75pt;height:403.5pt'>

1542

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image012.png"

1543

o:title=""/>

1544

</v:shape><![endif]--><![if !vml]><img border=0 width=553 height=538

1545

src="Correlation_Tracking_Guide_2010-Dateien/image013.jpg" v:shapes="_x0000_i1032"><![endif]><o:p></o:p>

1546

1547

<span

1548

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1549

1550

<span lang=EN-US

1551

style='mso-ansi-language:EN-US'>Fig. 5: The opened base image and the menu to

1552

select a preexisting grid.<o:p></o:p>

1553

1554

<span

1555

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1556

1557

<span

1558

lang=EN-US style='mso-ansi-language:EN-US'>You will get a new choice where you

1559

can select a shape for your grid.<o:p></o:p>

1560

1561

<span

1562

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1563

1564

<span

1565

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1033"

1566

type="#_x0000_t75" style='width:125.25pt;height:219.75pt'>

1567

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image014.png"

1568

o:title=""/>

1569

</v:shape><![endif]--><![if !vml]><img border=0 width=167 height=293

1570

src="Correlation_Tracking_Guide_2010-Dateien/image015.jpg" v:shapes="_x0000_i1033"><![endif]><o:p></o:p>

1571

1572

<span

1573

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1574

1575

<span

1576

lang=EN-US style='mso-ansi-language:EN-US'>The different types are a

1577

rectangular or circular grid, two markers, or a line of markers. If you choose a

1142

1578

rectangular grid type, the pointer will change from an arrow to a horizontal

1143

1579

and a vertical line which will help you finding the right position. The idea is

1144

1580

to click on the two diagonal positions which will define the outer dimensions

1145

1581

of a box containing the grid.<o:p></o:p>

1146

1582

1147

<span

1148

style='mso-ansi-language:EN-US'><o:p> </o:p>

1583

<span

1584

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1149

1585

1150

<span

1151

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1029"

1586

<span

1587

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1034"

1152

1588

type="#_x0000_t75" style='width:414.75pt;height:200.25pt'>

1153

<v:imagedata src="Correlation_Guide_2_files/image013.jpg" o:title="grid_generator_4"/>

1589

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image016.jpg"

1590

o:title="grid_generator_4"/>

1154

1591

</v:shape><![endif]--><![if !vml]><img border=0 width=553 height=267

1155

src="Correlation_Guide_2_files/image014.jpg" v:shapes="_x0000_i1029"><![endif]><o:p></o:p>

1156

1157

<span

1158

style='mso-ansi-language:EN-US'><o:p> </o:p>

1159

1160

<span style='mso-ansi-language:

1161

EN-US'>Fig. 6: The horizontal and vertical lines allow an accurate positioning

1162

of the grid.<o:p></o:p>

1163

1164

<span

1165

style='mso-ansi-language:EN-US'><o:p> </o:p>

1166

1167

<span

1168

style='mso-ansi-language:EN-US'>The selected box will be shown in the image and

1169

a dialog will pop up to ask your for the input of a raster point distance in x

1170

and y direction. <o:p></o:p>

1171

1172

<span

1173

style='mso-ansi-language:EN-US'><o:p> </o:p>

1174

1175

<span

1176

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1032"

1592

src="Correlation_Tracking_Guide_2010-Dateien/image016.jpg" v:shapes="_x0000_i1034"><![endif]><o:p></o:p>

1593

1594

<span

1595

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1596

1597

<span lang=EN-US

1598

style='mso-ansi-language:EN-US'>Fig. 6: The horizontal and vertical lines allow

1599

an accurate positioning of the grid.<o:p></o:p>

1600

1601

<span

1602

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1603

1604

<span

1605

lang=EN-US style='mso-ansi-language:EN-US'>The selected box will be shown in

1606

the image and a dialog will pop up to ask your for the input of a raster point

1607

distance in x and y direction. <o:p></o:p>

1608

1609

<span

1610

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1611

1612

<span

1613

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1035"

1177

1614

type="#_x0000_t75" style='width:243pt;height:99pt'>

1178

<v:imagedata src="Correlation_Guide_2_files/image015.jpg" o:title="grid_generator_5"

1179

cropbottom="44691f" cropright="27208f"/>

1615

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image017.jpg"

1616

o:title="grid_generator_5"/>

1180

1617

</v:shape><![endif]--><![if !vml]><img border=0 width=324 height=132

1181

src="Correlation_Guide_2_files/image016.jpg" v:shapes="_x0000_i1032"><![endif]><o:p></o:p>

1182

1183

<span

1184

style='mso-ansi-language:EN-US'><o:p> </o:p>

1185

1186

<span style='mso-ansi-language:

1187

EN-US'>Fig. 7: Horizontal (x-direction) and vertical (y-direction) grid

1188

resolution with a default resolution of 50 pixel distance between raster points.<o:p></o:p>

1189

1190

<span

1191

style='mso-ansi-language:EN-US'><o:p> </o:p>

1192

1193

<span

1194

style='mso-ansi-language:EN-US'>The code will now generate the chosen grid and will

1195

plot it on top of the sample image. The last dialogue will ask you if you want

1196

to use the generated grid and save the grid_x.dat and grid_y.dat to be

1197

processed, if you want to try again or if you want to choose another grid type.<o:p></o:p>

1198

1199

<span

1200

style='mso-ansi-language:EN-US'><o:p> </o:p>

1201

1202

<span

1203

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1033"

1618

src="Correlation_Tracking_Guide_2010-Dateien/image017.jpg" v:shapes="_x0000_i1035"><![endif]><o:p></o:p>

1619

1620

<span

1621

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1622

1623

<span lang=EN-US

1624

style='mso-ansi-language:EN-US'>Fig. 7: Horizontal (x-direction) and vertical

1625

(y-direction) grid resolution with a default resolution of 50 pixel distance

1626

between raster points.<o:p></o:p>

1627

1628

<span

1629

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1630

1631

<span

1632

lang=EN-US style='mso-ansi-language:EN-US'>The code will now generate the

1633

chosen grid and will plot it on top of the sample image. The last dialogue will

1634

ask you if you want to use the generated grid and save the grid_x.dat and

1635

grid_y.dat to be processed, if you want to try again or if you want to choose

1636

another grid type.<o:p></o:p>

1637

1638

<span

1639

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1640

1641

<span

1642

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1036"

1204

1643

type="#_x0000_t75" style='width:117pt;height:97.5pt'>

1205

<v:imagedata src="Correlation_Guide_2_files/image017.jpg" o:title="grid_generator_7"

1206

cropbottom="45007f" cropright="47082f"/>

1644

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image018.jpg"

1645

o:title="grid_generator_7"/>

1207

1646

</v:shape><![endif]--><![if !vml]><img border=0 width=156 height=130

1208

src="Correlation_Guide_2_files/image018.jpg" v:shapes="_x0000_i1033"><![endif]><o:p></o:p>

1209

1210

<span

1211

style='mso-ansi-language:EN-US'><o:p> </o:p>

1212

1213

<span style='mso-ansi-language:

1214

EN-US'>Fig. 8: The last menu will allow you to accept the grid (which will be

1215

saved), try again or choose another grid type.<o:p></o:p>

1216

1217

<span

1218

style='mso-ansi-language:EN-US'><o:p> </o:p>

1219

1220

<span

1221

style='mso-ansi-language:EN-US'><o:p> </o:p>

1222

1223

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

1224

mso-list:l0 level1 lfo1;tab-stops:list .5in'><![if !supportLists]><span

1225

style='font-size:16.0pt;mso-ansi-language:EN-US'>3.<span

1226

style='font:7.0pt "Times New Roman"'>    <![endif]><span

1227

style='font-size:16.0pt;mso-ansi-language:EN-US'>Run correlation with automate_image.m:<o:p></o:p>

1228

1229

<span

1230

style='mso-ansi-language:EN-US'><o:p> </o:p>

1231

1232

<span

1233

style='mso-ansi-language:EN-US'>The automation function is the central function

1234

and processes all markers and images. Therefore the �Current directory� in

1235

matlab has to be the folder where automate_image.m finds the filenamelist.mat,

1236

grid_x.dat and grid_y.dat as well as the images specified in �filenamelist.mat�.

1237

Just type �automate_image;� and press �ENTER� at the command line of matlab. <o:p></o:p>

1238

1239

<span

1240

style='mso-ansi-language:EN-US'>At first, automate_image.m will open the first

1241

image in the filenamelist.mat and plot the grid as green crosses on top. The

1242

next step will need some time since all markers in that image have to be

1243

processed for the first image. After correlating image one and two the new

1647

src="Correlation_Tracking_Guide_2010-Dateien/image018.jpg" v:shapes="_x0000_i1036"><![endif]><o:p></o:p>

1648

1649

<span

1650

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1651

1652

<span lang=EN-US

1653

style='mso-ansi-language:EN-US'>Fig. 8: The last menu will allow you to accept

1654

the grid (which will be saved), try again or choose another grid type.<o:p></o:p>

1655

1656

<span lang=EN-US

1657

style='mso-ansi-language:EN-US'><o:p> </o:p>

1658

1659

<span lang=EN-US

1660

style='mso-ansi-language:EN-US'>You will be asked if you would like to add more

1661

points ro if you would like to remove markers. If you are happy with the result

1662

just hit END.<o:p></o:p>

1663

1664

<span lang=EN-US

1665

style='mso-ansi-language:EN-US'><o:p> </o:p>

1666

1667

<span lang=EN-US

1668

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1037"

1669

type="#_x0000_t75" style='width:125.25pt;height:219.75pt'>

1670

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image019.png"

1671

o:title=""/>

1672

</v:shape><![endif]--><![if !vml]><img border=0 width=167 height=293

1673

src="Correlation_Tracking_Guide_2010-Dateien/image020.jpg" v:shapes="_x0000_i1037"><![endif]><o:p></o:p>

1674

1675

<span

1676

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1677

1678

<span

1679

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1680

1681

<span

1682

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1683

1684

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

1685

-18.0pt;mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'><![if !supportLists]><span

1686

lang=EN-US style='font-size:16.0pt;mso-ansi-language:EN-US'><span

1687

style='mso-list:Ignore'>3.

1688

<![endif]><span lang=EN-US style='font-size:16.0pt;

1689

mso-ansi-language:EN-US'>Run correlation with automate_image.m or with

1690

automate_image_mp_2009b.m:<o:p></o:p>

1691

1692

<span

1693

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1694

1695

<span

1696

lang=EN-US style='mso-ansi-language:EN-US'>The automation function is the

1697

central function and processes all markers and images. Therefore the �Current

1698

directory� in matlab has to be the folder where automate_image.m finds the

1699

filenamelist.mat, grid_x.dat and grid_y.dat as well as the images specified in

1700

�filenamelist.mat�. Just type �automate_image;� and press �ENTER� at the

1701

command line of matlab. <o:p></o:p>

1702

1703

<span

1704

lang=EN-US style='mso-ansi-language:EN-US'>At first, automate_image.m will open

1705

the first image in the filenamelist.mat and plot the grid as green crosses on

1706

top. The next step will need some time since all markers in that image have to

1707

be processed for the first image. After correlating image one and two the new

1244

1708

raster positions will be plotted as red crosses. On top of the image and the

1245

1709

green crosses. The next dialog will ask you if you want to continue with this

1246

1710

correlation or cancel. If you press continue, �automate_image.m� will process

1248

1712

images will be plotted on the figure but can easily be estimated by knowing the

1249

1713

raster point processing speed (see processing speed). <o:p></o:p>

1250

1714

1251

<span

1252

style='mso-ansi-language:EN-US'>Depending on the number of images and markers

1253

you are tracking, this process can take between seconds and days. For 100

1254

images and 200 markers a decent computer should need 200 seconds. To get a

1255

better resolution you can always run jobs overnight (e.g. 6000 markers in 1000

1256

images) with higher resolutions. <o:p></o:p>

1257

1258

<span

1259

style='mso-ansi-language:EN-US'>Keep in mind that �CORRSIZE� which you changed

1260

in �cpcorr.m� will limit your resolution. If you chose to use the 15 pixel as

1261

suggested a marker distance of 30 pixel will lead to a full cover of the strain

1262

field. Choosing smaller marker distances will lead to an interpolation since

1263

two neighboring markers share pixels. Nevertheless a higher marker density can

1264

reduce the noise of the strain field.<o:p></o:p>

1265

1266

<span

1267

style='mso-ansi-language:EN-US'>When all images are processed, automate_image

1268

will write the files validx.mat, validy.mat, validx.txt and validy.txt. The

1269

text files are meant to store the result in a format which can be accessed by

1270

other programs also in the future. <o:p></o:p>

1271

1272

<span

1273

style='mso-ansi-language:EN-US'><o:p> </o:p>

1274

1275

<span

1276

style='mso-ansi-language:EN-US'>To stop automate_image use the key combination

1277

�Ctrl c�. <o:p></o:p>

1278

1279

<span

1280

style='mso-ansi-language:EN-US'>In case of a crashes, errors generating the

1281

right filenamelist or the interruption of the correlation process by the user,

1282

the function �recover_correlation.m� can be called which extracts the last

1283

marker positions sets up �automate_image.m� and continues at the last image.<o:p></o:p>

1284

1285

<span

1286

style='mso-ansi-language:EN-US'><o:p> </o:p>

1287

1288

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

1289

mso-list:l0 level1 lfo1;tab-stops:list .5in'><![if !supportLists]><span

1290

style='font-size:16.0pt;mso-ansi-language:EN-US'>4.<span

1291

style='font:7.0pt "Times New Roman"'>    <![endif]><span

1292

style='font-size:16.0pt;mso-ansi-language:EN-US'>Analyze the displacement with

1293

displacement.m:<o:p></o:p>

1294

1295

<span

1296

style='mso-ansi-language:EN-US'><o:p> </o:p>

1297

1298

<span

1299

style='mso-ansi-language:EN-US'>As last part, the post processing is the most

1300

interesting and awarding step since you actually can analyze the collected

1301

displacement data. The displacement.m function is a small collection of

1302

functions which allows you to review the displacement field, calculate the

1715

<span

1716

lang=EN-US style='mso-ansi-language:EN-US'>Depending on the number of images

1717

and markers you are tracking, this process can take between seconds and days.

1718

For 100 images and 200 markers a decent computer should need 200 seconds. To

1719

get a better resolution you can always run jobs overnight (e.g. 6000 markers in

1720

1000 images) with higher resolutions. <o:p></o:p>

1721

1722

<span

1723

lang=EN-US style='mso-ansi-language:EN-US'>Keep in mind that �CORRSIZE� which

1724

you changed in �cpcorr.m� will limit your resolution. If you chose to use the

1725

15 pixel as suggested a marker distance of 30 pixel will lead to a full cover

1726

of the strain field. Choosing smaller marker distances will lead to an

1727

interpolation since two neighboring markers share pixels. Nevertheless a higher

1728

marker density can reduce the noise of the strain field.<o:p></o:p>

1729

1730

<span

1731

lang=EN-US style='mso-ansi-language:EN-US'>When all images are processed,

1732

automate_image will write the files validx.mat, validy.mat, validx.txt and

1733

validy.txt. The text files are meant to store the result in a format which can

1734

be accessed by other programs also in the future. <o:p></o:p>

1735

1736

<span

1737

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1738

1739

<span

1740

lang=EN-US style='mso-ansi-language:EN-US'>To stop automate_image use the key

1741

combination �Ctrl c�. <o:p></o:p>

1742

1743

<span

1744

lang=EN-US style='mso-ansi-language:EN-US'>In case of a crashes, errors

1745

generating the right filenamelist or the interruption of the correlation

1746

process by the user, the function �recover_correlation.m� can be called which

1747

extracts the last marker positions sets up �automate_image.m� and continues at

1748

the last image.<o:p></o:p>

1749

1750

<span

1751

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1752

1753

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

1754

-18.0pt;mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'><![if !supportLists]><span

1755

lang=EN-US style='font-size:16.0pt;mso-ansi-language:EN-US'><span

1756

style='mso-list:Ignore'>4.

1757

<![endif]><span lang=EN-US style='font-size:16.0pt;

1758

mso-ansi-language:EN-US'>Analyze the displacement with displacement.m:<o:p></o:p>

1759

1760

<span

1761

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1762

1763

<span

1764

lang=EN-US style='mso-ansi-language:EN-US'>As last part, the post processing is

1765

the most interesting and awarding step since you actually can analyze the

1766

collected displacement data. The displacement.m function is a small collection

1767

of functions which allows you to review the displacement field, calculate the

1303

1768

strain or delete markers which were not correlated or tracked very well. <o:p></o:p>

1304

1769

1305

<span

1306

style='mso-ansi-language:EN-US'>To start, type into the command window

1307

�displacement;� or �[validx,validy]=displacement;� in case you want to save the

1308

changed files (validx and validy) from the workspace (see chapter 3). A window

1309

will pop up asking you for the validx.dat file which contains the

1310

x-displacement off all markers in all images, followed by a dialog for the

1311

validy.dat containing the y data. After �displacement.m� has loaded both files,

1312

a new window pops up which allows you to choose between different options.<o:p></o:p>

1313

1314

<span

1315

style='mso-ansi-language:EN-US'><o:p> </o:p>

1316

1317

<span

1318

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1034"

1319

type="#_x0000_t75" style='width:179.25pt;height:241.5pt'>

1320

<v:imagedata src="Correlation_Guide_2_files/image019.jpg" o:title="displacement_1"

1321

cropbottom="14666f" cropright="37262f"/>

1322

</v:shape><![endif]--><![if !vml]><img border=0 width=239 height=322

1323

src="Correlation_Guide_2_files/image020.jpg" v:shapes="_x0000_i1034"><![endif]><o:p></o:p>

1324

1325

<span

1326

style='mso-ansi-language:EN-US'><o:p> </o:p>

1327

1328

<span style='mso-ansi-language:

1329

EN-US'>Fig. 9: The displacement.m function allows cleaning up the data set

1330

selecting parts of it plot the displacement or measure the strain in x- and y-direction.<o:p></o:p>

1331

1332

<span

1333

style='mso-ansi-language:EN-US'><o:p> </o:p>

1334

1335

<span

1336

style='mso-ansi-language:EN-US'>For a typical analysis you always have to

1337

delete some of the markers with did not all too well during the correlation or

1338

peak fitting step. This can happen e.g. due to marker movement during the test,

1339

changing light conditions or in case of the correlation technique due to the

1340

fact that the sample surface did not provide enough characteristics. <o:p></o:p>

1341

1342

<span

1343

style='mso-ansi-language:EN-US'>We start with clicking on the <b

1770

<span

1771

lang=EN-US style='mso-ansi-language:EN-US'>To start, type into the command

1772

window �displacement;� or �[validx,validy]=displacement;� in case you want to

1773

save the changed files (validx and validy) from the workspace (see chapter 3).

1774

A window will pop up asking you for the validx.dat file which contains the x-displacement

1775

off all markers in all images, followed by a dialog for the validy.dat

1776

containing the y data. After �displacement.m� has loaded both files, a new

1777

window pops up which allows you to choose between different options.<o:p></o:p>

1778

1779

<span

1780

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1781

1782

<span

1783

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1038"

1784

type="#_x0000_t75" style='width:234.75pt;height:408.75pt'>

1785

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image021.png"

1786

o:title=""/>

1787

</v:shape><![endif]--><![if !vml]><img border=0 width=313 height=545

1788

src="Correlation_Tracking_Guide_2010-Dateien/image022.jpg" v:shapes="_x0000_i1038"><![endif]><o:p></o:p>

1789

1790

<span

1791

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1792

1793

<span lang=EN-US

1794

style='mso-ansi-language:EN-US'>Fig. 9: The displacement.m function allows

1795

cleaning up the data set selecting parts of it plot the displacement or measure

1796

the strain in x- and y-direction.<o:p></o:p>

1797

1798

<span

1799

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1800

1801

<span

1802

lang=EN-US style='mso-ansi-language:EN-US'>For a typical analysis you always

1803

have to delete some of the markers with did not all too well during the

1804

correlation or peak fitting step. This can happen e.g. due to marker movement

1805

during the test, changing light conditions or in case of the correlation

1806

technique due to the fact that the sample surface did not provide enough

1807

characteristics. <o:p></o:p>

1808

1809

<span

1810

lang=EN-US style='mso-ansi-language:EN-US'>We start with clicking on the <b

1344

1811

style='mso-bidi-font-weight:normal'>�3D Mesh Plot of Displacement� button which

1345

will bring up a new window and a dialog asking if you want to create a video. Clicking

1346

on �yes� will create a new folder called video and the 3D displacement plot of

1347

each image will be saved as *.jpg. The click on the no button will just start

1348

the 3D displacement plot. This part of the �displacement.m� allows you to watch

1349

displacement (z-axis) versus location (x- and y-axis) for all images. To get a

1350

better 3-dimensional understanding all markers are projected as green dots on

1351

the plane normal to the y axis. The Image number will be shown in the plot. It

1352

has to be noted that the orientation of the strain depends on the orientation

1353

of the image during the correlation process. The x-axis in the plot is the

1354

horizontal direction in the image and the y-direction the perpendicular

1812

will bring up a new window and a dialog asking if you want to create a video.

1813

Clicking on �yes� will create a new folder called video and the 3D displacement

1814

plot of each image will be saved as *.jpg. The click on the no button will just

1815

start the 3D displacement plot. This part of the �displacement.m� allows you to

1816

watch displacement (z-axis) versus location (x- and y-axis) for all images. To

1817

get a better 3-dimensional understanding all markers are projected as green

1818

dots on the plane normal to the y axis. The Image number will be shown in the

1819

plot. It has to be noted that the orientation of the strain depends on the

1820

orientation of the image during the correlation process. The x-axis in the plot

1821

is the horizontal direction in the image and the y-direction the perpendicular

1355

1822

direction. The plotted displacement on the z-axis is always the x-displacement

1356

1823

of the data contained in validx.mat and validy.mat. To look at the y

1357

1824

displacement the user has to wait for all images to be plotted and then after

1362

1829

The user has to keep track of this change since it will affect all plotting and

1363

1830

strain measurement steps lying ahead during the same �displacement.m� session. <o:p></o:p>

1364

1831

1365

<span

1366

style='mso-ansi-language:EN-US'><o:p> </o:p>

1367

1368

<span

1369

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1035"

1370

type="#_x0000_t75" style='width:342pt;height:303.75pt'>

1371

<v:imagedata src="Correlation_Guide_2_files/image021.jpg" o:title="displacement_2"

1372

cropbottom="1547f" cropright="11695f"/>

1373

</v:shape><![endif]--><![if !vml]><img border=0 width=456 height=405

1374

src="Correlation_Guide_2_files/image022.jpg" v:shapes="_x0000_i1035"><![endif]><o:p></o:p>

1375

1376

<span

1377

style='mso-ansi-language:EN-US'><o:p> </o:p>

1378

1379

<span style='mso-ansi-language:

1380

EN-US'>Fig. 10: 3D Displacement versus x- and y-position. The orientation of

1381

the x-axis is the horizontal in the analyzed image and the y-axis is the

1382

vertical. The displacement is always the x-diplacement until you exchange

1383

validx and validy with the �Rotate

1384

Orientation (exchange x and y)� button.<o:p></o:p>

1385

1386

<span

1387

style='mso-ansi-language:EN-US'><o:p> </o:p>

1388

1389

<span

1390

style='mso-ansi-language:EN-US'>The next step is to get rid of badly tracked

1391

markers. This can be done in three different ways:<o:p></o:p>

1392

1393

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

1394

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

1395

style='mso-ansi-language:EN-US'>-<span

1832

<span

1833

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1834

1835

<span

1836

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1039"

1837

type="#_x0000_t75" style='width:415.5pt;height:369pt'>

1838

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image023.png"

1839

o:title=""/>

1840

</v:shape><![endif]--><![if !vml]><img border=0 width=554 height=492

1841

src="Correlation_Tracking_Guide_2010-Dateien/image024.jpg" v:shapes="_x0000_i1039"><![endif]><o:p></o:p>

1842

1843

<span

1844

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1845

1846

<span lang=EN-US

1847

style='mso-ansi-language:EN-US'>Fig. 10: 3D Displacement versus x- and

1848

y-position. The orientation of the x-axis is the horizontal in the analyzed

1849

image and the y-axis is the vertical. The displacement is always the

1850

x-diplacement until you exchange validx and validy with the �<b

1851

style='mso-bidi-font-weight:normal'>Rotate Orientation (exchange x and y)�

1852

button.<o:p></o:p>

1853

1854

<span

1855

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1856

1857

<span

1858

lang=EN-US style='mso-ansi-language:EN-US'>The next step is to get rid of badly

1859

tracked markers. This can be done in three different ways:<o:p></o:p>

1860

1861

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

1862

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

1863

lang=EN-US style='mso-ansi-language:EN-US'>-<span

1396

1864

style='font:7.0pt "Times New Roman"'>         

1397

<![endif]>delete

1865

<![endif]>delete

1398

1866

single markers, click �Remove badly

1399

1867

tracked marker, one by one (Position)�<o:p></o:p>

1400

1868

1401

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

1402

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

1403

style='mso-ansi-language:EN-US'>-<span

1869

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

1870

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

1871

lang=EN-US style='mso-ansi-language:EN-US'>-<span

1404

1872

style='font:7.0pt "Times New Roman"'>         

1405

<![endif]>delete a

1406

bunch of markers at once, click �Delete

1873

<![endif]>delete

1874

a bunch of markers at once, click �Delete

1407

1875

multiple markers (Position)� <o:p></o:p>

1408

1876

1409

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

1410

mso-list:l2 level1 lfo2;tab-stops:list .5in'><![if !supportLists]><span

1411

style='mso-ansi-language:EN-US'>-<span

1877

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

1878

-18.0pt;mso-list:l2 level1 lfo2;tab-stops:list 36.0pt'><![if !supportLists]><span

1879

lang=EN-US style='mso-ansi-language:EN-US'>-<span

1412

1880

style='font:7.0pt "Times New Roman"'>         

1413

<![endif]>delete a

1414

bunch of markers from the displacement versus x position plot, click �<b

1881

<![endif]>delete

1882

a bunch of markers from the displacement versus x position plot, click �<b

1415

1883

style='mso-bidi-font-weight:normal'>Delete markers from displacement vs.

1416

1884

position plot�.<o:p></o:p>

1417

1885

1418

<span

1419

style='mso-ansi-language:EN-US'>The first two will provide you with a top down

1420

view with x- and y axis being the horizontal and vertical direction in the

1421

analyzed image and the displacement is expressed as underlying colors. The third

1422

option will show the projected markers which allows you to sometimes more easily

1423

access the peaks. You have to play around with these two different views and

1424

rotate the orientation back and forth while you are checking through the images

1425

until you get a clean data set. This requires some practice, therefore take

1426

your time and analyze the data carefully before you really delete a bunch of

1427

markers.<o:p></o:p>

1886

<span

1887

lang=EN-US style='mso-ansi-language:EN-US'>The first two will provide you with

1888

a top down view with x- and y axis being the horizontal and vertical direction

1889

in the analyzed image and the displacement is expressed as underlying colors.

1890

The third option will show the projected markers which allows you to sometimes

1891

more easily access the peaks. You have to play around with these two different

1892

views and rotate the orientation back and forth while you are checking through

1893

the images until you get a clean data set. This requires some practice,

1894

therefore take your time and analyze the data carefully before you really

1895

delete a bunch of markers.<o:p></o:p>

1428

1896

1429

<span

1430

style='mso-ansi-language:EN-US'>�Remove

1431

badly tracked marker, one by one (Position)� will allow you to click on

1432

markers which are not at the right place. The marker with the highest

1433

displacement value will be a red dot while the marker with the lowest

1897

<span

1898

lang=EN-US style='mso-ansi-language:EN-US'>�<b style='mso-bidi-font-weight:

1899

normal'>Remove badly tracked marker, one by one (Position)� will allow you

1900

to click on markers which are not at the right place. The marker with the

1901

highest displacement value will be a red dot while the marker with the lowest

1434

1902

displacement will be a blue dot. By clicking close to one of the markers the

1435

1903

plot will be updated to the new displacement field and the color code will be

1436

1904

updated to the new highest and lowest displacement value.<o:p></o:p>

1437

1905

1438

<span

1439

style='mso-ansi-language:EN-US'>�Delete

1440

multiple markers (Position)� will allow you to choose a rectangle and all

1441

markers in it will be deleted.<o:p></o:p>

1442

1443

<span

1444

style='mso-ansi-language:EN-US'>The same applies to the �<b style='mso-bidi-font-weight:

1445

normal'>Delete markers from displacement vs. position plot�, it is just a

1446

different view of the markers.<o:p></o:p>

1447

1448

<span

1449

style='mso-ansi-language:EN-US'><o:p> </o:p>

1450

1451

<span

1452

style='mso-ansi-language:EN-US'>After cleaning up the data set and if you have

1453

started the �displacement.m� file with �[validx,validy]=displacement;�, you

1454

will find validx and validy as variables in the workspace. Right-click on them

1455

and save the selection with a different name than validx.mat and validy.mat and

1456

nect time you open up �displacement.m� choose them. <o:p></o:p>

1457

1458

<span

1459

style='mso-ansi-language:EN-US'><o:p> </o:p>

1460

1461

<span

1462

style='mso-ansi-language:EN-US'>After cleaning up and saving the data you will

1463

want to measure strain. Here also two ways you can choose. The first one is

1464

straight forward by just clicking on either �<b style='mso-bidi-font-weight:

1906

<span

1907

lang=EN-US style='mso-ansi-language:EN-US'>�<b style='mso-bidi-font-weight:

1908

normal'>Delete multiple markers (Position)� will allow you to choose a

1909

rectangle and all markers in it will be deleted.<o:p></o:p>

1910

1911

<span

1912

lang=EN-US style='mso-ansi-language:EN-US'>The same applies to the �<b

1913

style='mso-bidi-font-weight:normal'>Delete markers from displacement vs.

1914

position plot�, it is just a different view of the markers.<o:p></o:p>

1915

1916

<b

1917

style='mso-bidi-font-weight:normal'><span lang=EN-US style='mso-ansi-language:

1918

EN-US'>Delete markers moving relative to their neighbors <span

1919

lang=EN-US style='mso-ansi-language:EN-US'>which finds the next 10 or 20

1920

neighbor markers and plots the relative distance to these guys. If you acquired

1921

a lot of markers and images that may take a while. If you want a noise free

1922

image this tool allows you to find the bad guys jumping around between

1923

positions:<o:p></o:p>

1924

1925

<b

1926

style='mso-bidi-font-weight:normal'><span lang=EN-US style='mso-ansi-language:

1927

EN-US'><o:p> </o:p>

1928

1929

<b

1930

style='mso-bidi-font-weight:normal'><span lang=EN-US style='mso-ansi-language:

1931

EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1040" type="#_x0000_t75"

1932

style='width:282pt;height:84.75pt'>

1933

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image025.png"

1934

o:title=""/>

1935

</v:shape><![endif]--><![if !vml]><img border=0 width=376 height=113

1936

src="Correlation_Tracking_Guide_2010-Dateien/image026.jpg" v:shapes="_x0000_i1040"><![endif]><o:p></o:p>

1937

1938

<b

1939

style='mso-bidi-font-weight:normal'><span lang=EN-US style='mso-ansi-language:

1940

EN-US'><o:p> </o:p>

1941

1942

<b

1943

style='mso-bidi-font-weight:normal'><span lang=EN-US style='mso-ansi-language:

1944

EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1041" type="#_x0000_t75"

1945

style='width:415.5pt;height:369pt'>

1946

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image027.png"

1947

o:title=""/>

1948

</v:shape><![endif]--><![if !vml]><img border=0 width=554 height=492

1949

src="Correlation_Tracking_Guide_2010-Dateien/image028.jpg" v:shapes="_x0000_i1041"><![endif]><o:p></o:p>

1950

1951

<b

1952

style='mso-bidi-font-weight:normal'><span lang=EN-US style='mso-ansi-language:

1953

EN-US'><o:p> </o:p>

1954

1955

<span

1956

lang=EN-US style='mso-ansi-language:EN-US'>The red line markes the maximum

1957

allowed difference to the other markers and the cross is where your mouse is

1958

hovering. If you click a second time where the mouse is in the figure, the

1959

minimum and maximum allowed relative displacement to the next neighbors would

1960

be just 0.11 pixels. This function helps a lot cleaning up your data set.<o:p></o:p>

1961

1962

<span

1963

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1964

1965

<span

1966

lang=EN-US style='mso-ansi-language:EN-US'>After cleaning up the data set and

1967

if you have started the �displacement.m� file with

1968

�[validx,validy]=displacement;�, you will find validx and validy as variables

1969

in the workspace. Right-click on them and save the selection with a different

1970

name than validx.mat and validy.mat and nect time you open up �displacement.m�

1971

choose them. <o:p></o:p>

1972

1973

<span

1974

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1975

1976

<span

1977

lang=EN-US style='mso-ansi-language:EN-US'>After cleaning up and saving the

1978

data you will want to measure strain. Here also two ways you can choose. The

1979

first one is straight forward by just clicking on either �<b style='mso-bidi-font-weight:

1465

1980

normal'>Strain Measurement between 2 Points� which will let you choose two

1466

1981

points or �1D Average Strain Measurement�

1467

1982

which will use all points available. The second one is to select markers with �<b

1472

1987

the x-displacement versus the x-position. In case the data was not rotated, the

1473

1988

strain in horizontal direction in the image will be measured. <o:p></o:p>

1474

1989

1475

<span

1476

style='mso-ansi-language:EN-US'><o:p> </o:p>

1477

1478

<span

1479

style='mso-ansi-language:EN-US'>After clicking on �<b style='mso-bidi-font-weight:

1480

normal'>Strain Measurement between 2 Points� you will have to choose two

1481

points. The function will find the closest two points to where you clicked and

1482

plot the strain versus image number.<o:p></o:p>

1483

1484

<span

1485

style='mso-ansi-language:EN-US'>If you are not happy with the result you can

1486

still choose two other markers by clicking �Yes� in the next dialog. If you

1487

stick with these markers, you can either save the result as a text file (�image_1Dstrain.txt�)

1488

or just go back to the �displacement.m� dialog. Make sure you change the filename

1489

in the explorer before you run this code another time since it will just

1490

overwrite it.<o:p></o:p>

1491

1492

<span style='mso-ansi-language:

1493

EN-US'><o:p> </o:p>

1494

1495

<span

1496

style='mso-ansi-language:EN-US'><o:p> </o:p>

1497

1498

<span

1499

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1036"

1990

<span

1991

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

1992

1993

<span

1994

lang=EN-US style='mso-ansi-language:EN-US'>After clicking on �<b

1995

style='mso-bidi-font-weight:normal'>Strain Measurement between 2 Points�

1996

you will have to choose two points. The function will find the closest two

1997

points to where you clicked and plot the strain versus image number.<o:p></o:p>

1998

1999

<span

2000

lang=EN-US style='mso-ansi-language:EN-US'>If you are not happy with the result

2001

you can still choose two other markers by clicking �Yes� in the next dialog. If

2002

you stick with these markers, you can either save the result as a text file (�image_1Dstrain.txt�)

2003

or just go back to the �displacement.m� dialog. Make sure you change the

2004

filename in the explorer before you run this code another time since it will

2005

just overwrite it.<o:p></o:p>

2006

2007

<span lang=EN-US

2008

style='mso-ansi-language:EN-US'><o:p> </o:p>

2009

2010

<span

2011

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2012

2013

<span

2014

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1042"

1500

2015

type="#_x0000_t75" style='width:331.5pt;height:302.25pt'>

1501

<v:imagedata src="Correlation_Guide_2_files/image023.jpg" o:title="displacement_3"

1502

cropright="11695f"/>

2016

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image029.jpg"

2017

o:title="displacement_3"/>

1503

2018

</v:shape><![endif]--><![if !vml]><img border=0 width=442 height=403

1504

src="Correlation_Guide_2_files/image024.jpg" v:shapes="_x0000_i1036"><![endif]><o:p></o:p>

1505

1506

<span

1507

style='mso-ansi-language:EN-US'><o:p> </o:p>

1508

1509

<span style='mso-ansi-language:

1510

EN-US'>Fig. 11: From this window two points can be picked which will be used to

1511

measure the strain<o:p></o:p>

1512

1513

<span

1514

style='mso-ansi-language:EN-US'><o:p> </o:p>

1515

1516

<span

1517

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1037"

1518

type="#_x0000_t75" style='width:331.5pt;height:296.25pt'>

1519

<v:imagedata src="Correlation_Guide_2_files/image025.jpg" o:title="displacement_4"

1520

cropbottom="1147f" cropright="11695f"/>

1521

</v:shape><![endif]--><![if !vml]><img border=0 width=442 height=395

1522

src="Correlation_Guide_2_files/image026.jpg" v:shapes="_x0000_i1037"><![endif]><o:p></o:p>

1523

1524

<span

1525

style='mso-ansi-language:EN-US'><o:p> </o:p>

1526

1527

<span style='mso-ansi-language:

1528

EN-US'>Fig. 12: Strain versus image number<o:p></o:p>

1529

1530

<span style='mso-ansi-language:

1531

EN-US'><o:p> </o:p>

1532

1533

<span

1534

style='mso-ansi-language:EN-US'>After clicking on the �<b style='mso-bidi-font-weight:

1535

normal'>1D Average Strain Measurement� button, the x-displacement versus

1536

x-direction will be plotted for each image and then fitted by a linear

1537

function. The slope is the true strain which will be plotted versus the image

1538

number after all images are processed. If you choose to save the strain versus

1539

image number you will be asked where you want to save the data as an ASCII file

1540

which can be opened with matlab, excel or just the notepad.<o:p></o:p>

1541

1542

<span style='mso-ansi-language:

1543

EN-US'><o:p> </o:p>

1544

1545

<span style='mso-ansi-language:

1546

EN-US'><o:p> </o:p>

1547

1548

<span

1549

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1038"

1550

type="#_x0000_t75" style='width:342pt;height:306pt'>

1551

<v:imagedata src="Correlation_Guide_2_files/image027.jpg" o:title="displacement_5"

1552

cropbottom="1147f" cropright="11624f"/>

1553

</v:shape><![endif]--><![if !vml]><img border=0 width=456 height=408

1554

src="Correlation_Guide_2_files/image028.jpg" v:shapes="_x0000_i1038"><![endif]><o:p></o:p>

1555

1556

<span style='mso-ansi-language:

1557

EN-US'><o:p> </o:p>

1558

1559

<span style='mso-ansi-language:

1560

EN-US'>Fig. 13: The slope of the linear fit of the displacement versus position

1561

allows to plot the true strain versus image number.<o:p></o:p>

1562

1563

<span style='mso-ansi-language:

1564

EN-US'><o:p> </o:p>

1565

1566

<span

1567

style='mso-ansi-language:EN-US'><o:p> </o:p>

1568

1569

<span

1570

style='mso-ansi-language:EN-US'>If you want to analyze a special part of your

1571

sample it is best to use the �Select

2019

src="Correlation_Tracking_Guide_2010-Dateien/image029.jpg" v:shapes="_x0000_i1042"><![endif]><o:p></o:p>

2020

2021

<span

2022

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2023

2024

<span lang=EN-US

2025

style='mso-ansi-language:EN-US'>Fig. 11: From this window two points can be

2026

picked which will be used to measure the strain<o:p></o:p>

2027

2028

<span

2029

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2030

2031

<span

2032

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1043"

2033

type="#_x0000_t75" style='width:415.5pt;height:369pt'>

2034

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image030.png"

2035

o:title=""/>

2036

</v:shape><![endif]--><![if !vml]><img border=0 width=554 height=492

2037

src="Correlation_Tracking_Guide_2010-Dateien/image031.jpg" v:shapes="_x0000_i1043"><![endif]><o:p></o:p>

2038

2039

<span

2040

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2041

2042

<span lang=EN-US

2043

style='mso-ansi-language:EN-US'>Fig. 12: Strain versus image number<o:p></o:p>

2044

2045

<span lang=EN-US

2046

style='mso-ansi-language:EN-US'><o:p> </o:p>

2047

2048

<span

2049

lang=EN-US style='mso-ansi-language:EN-US'>After clicking on the �<b

2050

style='mso-bidi-font-weight:normal'>1D Average Strain Measurement� button,

2051

the x-displacement versus x-direction will be plotted for each image and then

2052

fitted by a linear function. The slope is the true strain which will be plotted

2053

versus the image number after all images are processed. If you choose to save

2054

the strain versus image number you will be asked where you want to save the

2055

data as an ASCII file which can be opened with matlab, excel or just the

2056

notepad.<o:p></o:p>

2057

2058

<span lang=EN-US

2059

style='mso-ansi-language:EN-US'><o:p> </o:p>

2060

2061

<span lang=EN-US

2062

style='mso-ansi-language:EN-US'><o:p> </o:p>

2063

2064

<span lang=EN-US

2065

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1044"

2066

type="#_x0000_t75" style='width:415.5pt;height:369pt'>

2067

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image032.png"

2068

o:title=""/>

2069

</v:shape><![endif]--><![if !vml]><img border=0 width=554 height=492

2070

src="Correlation_Tracking_Guide_2010-Dateien/image033.jpg" v:shapes="_x0000_i1044"><![endif]><o:p></o:p>

2071

2072

<span lang=EN-US

2073

style='mso-ansi-language:EN-US'><o:p> </o:p>

2074

2075

<span lang=EN-US

2076

style='mso-ansi-language:EN-US'>Fig. 13: The slope of the linear fit of the

2077

displacement versus position allows to plot the true strain versus image

2078

number.<o:p></o:p>

2079

2080

<span lang=EN-US

2081

style='mso-ansi-language:EN-US'><o:p> </o:p>

2082

2083

<span

2084

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2085

2086

<span

2087

lang=EN-US style='mso-ansi-language:EN-US'>If you want to analyze a special

2088

part of your sample it is best to use the �Select

1572

2089

Markers to Analyze� button in the �displacement.m� menu. The menu which

1573

2090

will pop up allows you to choose between different types of grids.<o:p></o:p>

1574

2091

1575

<span

1576

style='mso-ansi-language:EN-US'>After you have chosen the markers you want to

1577

process, run �1D Average Strain

1578

Measurement� to get the strain from these markers. Clicking the �<b

2092

<span

2093

lang=EN-US style='mso-ansi-language:EN-US'>After you have chosen the markers

2094

you want to process, run �1D Average

2095

Strain Measurement� to get the strain from these markers. Clicking the �<b

1579

2096

style='mso-bidi-font-weight:normal'>Rotate Orientation (exchange x and y)�

1580

2097

button and running the strain analysis again will give you the strain in the

1581

2098

perpendicular direction.<o:p></o:p>

1582

2099

1583

<span style='font-size:12.0pt;font-family:"Times New Roman";mso-fareast-font-family:

1584

"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:DE;mso-bidi-language:

1585

AR-SA'>

2100

<span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif";

2101

mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:

2102

DE;mso-bidi-language:AR-SA'>

1586

2103

1587

2104

1588

<span style='font-size:18.0pt;

1589

mso-ansi-language:EN-US'>5. Digital Image Tracking Quick Guide <o:p></o:p>

1590

1591

<span style='mso-ansi-language:

1592

EN-US'><o:p> </o:p>

1593

1594

<span style='mso-ansi-language:

1595

EN-US'>This guide should help you to perform a simple and fast analysis of your

1596

images. Before we start you should check your image format and the naming of

1597

your files. The preferred image format is *.tif and can be compressed with the

1598

packbits compression. JPEG or other image formats as well as MPEG video

1599

compression formats will not provide you with sub pixel resolution since the

1600

images are processed to save as much space as possible. The script we use to

1601

create a list of images to process (filelist_generator.m) is kind of limited to

1602

a certain format but it is possible to generate your own list of images which

1603

will be explained later. If you want to change the format or the names of your

1604

images you can use free programs like Irfanview (<a

2105

<span lang=EN-US

2106

style='font-size:18.0pt;mso-ansi-language:EN-US'>5. Digital Image Tracking

2107

Quick Guide <o:p></o:p>

2108

2109

<span lang=EN-US

2110

style='mso-ansi-language:EN-US'><o:p> </o:p>

2111

2112

<span lang=EN-US

2113

style='mso-ansi-language:EN-US'>This guide should help you to perform a simple

2114

and fast analysis of your images. Before we start you should check your image

2115

format and the naming of your files. The preferred image format is *.tif and

2116

can be compressed with the packbits compression. JPEG or other image formats as

2117

well as MPEG video compression formats will not provide you with sub pixel

2118

resolution since the images are processed to save as much space as possible.

2119

The script we use to create a list of images to process (filelist_generator.m)

2120

is kind of limited to a certain format but it is possible to generate your own

2121

list of images which will be explained later. If you want to change the format

2122

or the names of your images you can use free programs like Irfanview (<a

1605

2123

href="http://www.irfanview.com/">www.irfanview.com</a>) to batch process a huge

1606

2124

number of images.<o:p></o:p>

1607

2125

1608

<span style='mso-ansi-language:

1609

EN-US'><o:p> </o:p>

2126

<span lang=EN-US

2127

style='mso-ansi-language:EN-US'><o:p> </o:p>

1610

2128

1611

2129

<i style='mso-bidi-font-style:

1612

normal'>4 Steps to

1613

Success:<o:p></o:p>

1614

1615

<span style='mso-ansi-language:

1616

EN-US'><o:p> </o:p>

1617

1618

<span

1619

style='font-size:16.0pt;mso-ansi-language:EN-US'>1. Step: Filename list

1620

generation with filelist_generator.m<o:p></o:p>

1621

1622

<span

1623

style='mso-ansi-language:EN-US'><o:p> </o:p>

1624

1625

<span

1626

style='mso-ansi-language:EN-US'>Just type �filelist_generator;� and press

1627

�ENTER� at the command line of matlab. The following window should appear:<o:p></o:p>

1628

1629

<span

1630

style='mso-ansi-language:EN-US'><o:p> </o:p>

1631

1632

<span

1633

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1039"

2130

normal'>4

2131

Steps to Success:<o:p></o:p>

2132

2133

<span lang=EN-US

2134

style='mso-ansi-language:EN-US'><o:p> </o:p>

2135

2136

<span

2137

lang=EN-US style='font-size:16.0pt;mso-ansi-language:EN-US'>1. Step:

2138

Filename list generation with filelist_generator.m<o:p></o:p>

2139

2140

<span

2141

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2142

2143

<span

2144

lang=EN-US style='mso-ansi-language:EN-US'>Just type �filelist_generator;� and

2145

press �ENTER� at the command line of matlab. The following window should

2146

appear:<o:p></o:p>

2147

2148

<span

2149

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2150

2151

<span

2152

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1045"

1634

2153

type="#_x0000_t75" style='width:243pt;height:102.75pt'>

1635

<v:imagedata src="Correlation_Guide_2_files/image001.jpg" o:title="filelist_generator"

1636

cropbottom="43901f" cropright="27208f"/>

2154

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image007.jpg"

2155

o:title="filelist_generator"/>

1637

2156

</v:shape><![endif]--><![if !vml]><img border=0 width=324 height=137

1638

src="Correlation_Guide_2_files/image002.jpg" v:shapes="_x0000_i1039"><![endif]><o:p></o:p>

1639

1640

<span

1641

style='mso-ansi-language:EN-US'><o:p> </o:p>

1642

1643

<span style='mso-ansi-language:

1644

EN-US'>Fig. 1: Input of first and last image to create an image list with

1645

filelist_generator.m<o:p></o:p>

1646

1647

<span

1648

style='mso-ansi-language:EN-US'><o:p> </o:p>

1649

1650

<span

1651

style='mso-ansi-language:EN-US'>The numbers will be the number at the end of

1652

each filename. After depositing these numbers in the dialog the next window

1653

will ask for the first 4 letters of the filenames.<o:p></o:p>

1654

1655

<span

1656

style='mso-ansi-language:EN-US'><o:p> </o:p>

1657

1658

<span

1659

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1040"

2157

src="Correlation_Tracking_Guide_2010-Dateien/image007.jpg" v:shapes="_x0000_i1045"><![endif]><o:p></o:p>

2158

2159

<span

2160

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2161

2162

<span lang=EN-US

2163

style='mso-ansi-language:EN-US'>Fig. 1: Input of first and last image to create

2164

an image list with filelist_generator.m<o:p></o:p>

2165

2166

<span

2167

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2168

2169

<span

2170

lang=EN-US style='mso-ansi-language:EN-US'>The numbers will be the number at

2171

the end of each filename. After depositing these numbers in the dialog the next

2172

window will ask for the first 4 letters of the filenames.<o:p></o:p>

2173

2174

<span

2175

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2176

2177

<span

2178

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1046"

1660

2179

type="#_x0000_t75" style='width:243pt;height:1in'>

1661

<v:imagedata src="Correlation_Guide_2_files/image003.jpg" o:title="filelist_generator_2"

1662

cropbottom="50376f" cropright="27208f"/>

2180

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image008.jpg"

2181

o:title="filelist_generator_2"/>

1663

2182

</v:shape><![endif]--><![if !vml]><img border=0 width=324 height=96

1664

src="Correlation_Guide_2_files/image004.jpg" v:shapes="_x0000_i1040"><![endif]><o:p></o:p>

1665

1666

<span

1667

style='mso-ansi-language:EN-US'><o:p> </o:p>

1668

1669

<span style='mso-ansi-language:

1670

EN-US'>Fig. 2: Input for the first 4 letters in filelist_generator.m<o:p></o:p>

1671

1672

<span

1673

style='mso-ansi-language:EN-US'><o:p> </o:p>

1674

1675

<span

1676

style='mso-ansi-language:EN-US'>The next step is to save the file name list

1677

into the folder with the images to process.<o:p></o:p>

1678

1679

<span

1680

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1041"

2183

src="Correlation_Tracking_Guide_2010-Dateien/image008.jpg" v:shapes="_x0000_i1046"><![endif]><o:p></o:p>

2184

2185

<span

2186

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2187

2188

<span lang=EN-US

2189

style='mso-ansi-language:EN-US'>Fig. 2: Input for the first 4 letters in

2190

filelist_generator.m<o:p></o:p>

2191

2192

<span

2193

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2194

2195

<span

2196

lang=EN-US style='mso-ansi-language:EN-US'>The next step is to save the file

2197

name list into the folder with the images to process.<o:p></o:p>

2198

2199

<span

2200

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1047"

1681

2201

type="#_x0000_t75" style='width:252pt;height:162pt'>

1682

<v:imagedata src="Correlation_Guide_2_files/image005.jpg" o:title="filelist_generator_3"

1683

cropbottom="31426f" cropright="25789f"/>

2202

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image009.jpg"

2203

o:title="filelist_generator_3"/>

1684

2204

</v:shape><![endif]--><![if !vml]><img border=0 width=336 height=216

1685

src="Correlation_Guide_2_files/image006.jpg" v:shapes="_x0000_i1041"><![endif]><o:p></o:p>

1686

1687

<span

1688

style='mso-ansi-language:EN-US'><o:p> </o:p>

1689

1690

<span style='mso-ansi-language:

1691

EN-US'>Fig. 3: Dialog to save the file name list into the folder with the

1692

images to analyze.<o:p></o:p>

1693

1694

<span

1695

style='mso-ansi-language:EN-US'><o:p> </o:p>

1696

1697

<span

1698

style='mso-ansi-language:EN-US'><o:p> </o:p>

1699

1700

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

1701

mso-list:l3 level1 lfo4;tab-stops:list .5in'><![if !supportLists]><span

1702

style='font-size:16.0pt;mso-ansi-language:EN-US'>2.<span

1703

style='font:7.0pt "Times New Roman"'>    <![endif]><span

1704

style='font-size:16.0pt;mso-ansi-language:EN-US'>Run tracking with peak_labelling.m,

1705

pickpeak.m and strain_lineprofile.m:<o:p></o:p>

1706

1707

<span

1708

style='mso-ansi-language:EN-US'><o:p> </o:p>

1709

1710

<b

1711

style='mso-bidi-font-weight:normal'>�peak_labelling.m�<o:p></o:p>

1712

1713

<span

1714

style='mso-ansi-language:EN-US'>If you trust the automatic peak labeling, you

1715

can use �peak_labelling.m�. Type �[validx,validy]=peaklabelling;� It will scan

1716

your image and subtract the hopefully dark background and identify maxima with

1717

a value higher then a certain grey value. It will ask you for an image (the

1718

base image) which will be used to identify the peaks and run a first fit

1719

through all of them.<o:p></o:p>

1720

1721

<span

1722

style='mso-ansi-language:EN-US'><o:p> </o:p>

1723

1724

<span

1725

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1042"

2205

src="Correlation_Tracking_Guide_2010-Dateien/image009.jpg" v:shapes="_x0000_i1047"><![endif]><o:p></o:p>

2206

2207

<span

2208

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2209

2210

<span lang=EN-US

2211

style='mso-ansi-language:EN-US'>Fig. 3: Dialog to save the file name list into

2212

the folder with the images to analyze.<o:p></o:p>

2213

2214

<span

2215

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2216

2217

<span

2218

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2219

2220

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

2221

-18.0pt;mso-list:l3 level1 lfo4;tab-stops:list 36.0pt'><![if !supportLists]><span

2222

lang=EN-US style='font-size:16.0pt;mso-ansi-language:EN-US'><span

2223

style='mso-list:Ignore'>2.

2224

<![endif]><span lang=EN-US style='font-size:16.0pt;

2225

mso-ansi-language:EN-US'>Run tracking with peak_labelling.m, pickpeak.m and

2226

strain_lineprofile.m:<o:p></o:p>

2227

2228

<span

2229

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2230

2231

<b

2232

style='mso-bidi-font-weight:normal'><span lang=EN-US style='mso-ansi-language:

2233

EN-US'>�peak_labelling.m�<o:p></o:p>

2234

2235

<span

2236

lang=EN-US style='mso-ansi-language:EN-US'>If you trust the automatic peak

2237

labeling, you can use �peak_labelling.m�. Type �[validx,validy]=peaklabelling;�

2238

It will scan your image and subtract the hopefully dark background and identify

2239

maxima with a value higher then a certain grey value. It will ask you for an

2240

image (the base image) which will be used to identify the peaks and run a first

2241

fit through all of them.<o:p></o:p>

2242

2243

<span

2244

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2245

2246

<span

2247

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1048"

1726

2248

type="#_x0000_t75" style='width:252pt;height:164.25pt'>

1727

<v:imagedata src="Correlation_Guide_2_files/image007.jpg" o:title="grid_generator_1"

1728

cropbottom="30952f" cropright="25789f"/>

2249

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image034.jpg"

2250

o:title="grid_generator_1"/>

1729

2251

</v:shape><![endif]--><![if !vml]><img border=0 width=336 height=219

1730

src="Correlation_Guide_2_files/image008.jpg" v:shapes="_x0000_i1042"><![endif]><o:p></o:p>

1731

1732

<span

1733

style='mso-ansi-language:EN-US'><o:p> </o:p>

1734

1735

<span

1736

style='mso-ansi-language:EN-US'>Fig. : Open the first image for automatic peak

1737

identification.<o:p></o:p>

1738

1739

<span

1740

style='mso-ansi-language:EN-US'><o:p> </o:p>

1741

1742

<span

1743

style='mso-ansi-language:EN-US'>After opening the first image �peak_labelling�

1744

will plot the image as intensity plot where blue is low and red is high

1745

intensity. You will be asked to draw a box in which �peak_labelling� will check

1746

for peaks. After selecting the area, it will take some time to process. After

1747

identifying the peaks �peak labeling will automatically start to fit all peaks

1748

and plot the residuals of all peaks. Minimizing the matlab console window will

1749

increase processing speed. The title in the figure will indicate the status of

1750

the processing and the estimated time it will take.<o:p></o:p>

1751

1752

<span

1753

style='mso-ansi-language:EN-US'><o:p> </o:p>

1754

1755

<span

1756

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1043"

2252

src="Correlation_Tracking_Guide_2010-Dateien/image034.jpg" v:shapes="_x0000_i1048"><![endif]><o:p></o:p>

2253

2254

<span

2255

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2256

2257

<span

2258

lang=EN-US style='mso-ansi-language:EN-US'>Fig. : Open the first image for

2259

automatic peak identification.<o:p></o:p>

2260

2261

<span

2262

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2263

2264

<span

2265

lang=EN-US style='mso-ansi-language:EN-US'>After opening the first image

2266

�peak_labelling� will plot the image as intensity plot where blue is low and

2267

red is high intensity. You will be asked to draw a box in which

2268

�peak_labelling� will check for peaks. After selecting the area, it will take

2269

some time to process. After identifying the peaks �peak labeling will

2270

automatically start to fit all peaks and plot the residuals of all peaks.

2271

Minimizing the matlab console window will increase processing speed. The title

2272

in the figure will indicate the status of the processing and the estimated time

2273

it will take.<o:p></o:p>

2274

2275

<span

2276

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2277

2278

<span

2279

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1049"

1757

2280

type="#_x0000_t75" style='width:342pt;height:306pt'>

1758

<v:imagedata src="Correlation_Guide_2_files/image029.jpg" o:title="peaklabelling01"

1759

cropbottom="1188f" cropright="11589f"/>

2281

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image035.jpg"

2282

o:title="peaklabelling01"/>

1760

2283

</v:shape><![endif]--><![if !vml]><img border=0 width=456 height=408

1761

src="Correlation_Guide_2_files/image030.jpg" v:shapes="_x0000_i1043"><![endif]><o:p></o:p>

1762

1763

<span

1764

style='mso-ansi-language:EN-US'><o:p> </o:p>

1765

1766

<span

1767

style='mso-ansi-language:EN-US'>Fig. : Select an area to find peaks.<o:p></o:p>

1768

1769

<span

1770

style='mso-ansi-language:EN-US'><o:p> </o:p>

1771

1772

<span

1773

style='mso-ansi-language:EN-US'>At the end of the processing, all relevant

1774

files (�fitxy.dat� contains the fitting parameters for each point,

2284

src="Correlation_Tracking_Guide_2010-Dateien/image035.jpg" v:shapes="_x0000_i1049"><![endif]><o:p></o:p>

2285

2286

<span

2287

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2288

2289

<span

2290

lang=EN-US style='mso-ansi-language:EN-US'>Fig. : Select an area to find peaks.<o:p></o:p>

2291

2292

<span

2293

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2294

2295

<span

2296

lang=EN-US style='mso-ansi-language:EN-US'>At the end of the processing, all

2297

relevant files (�fitxy.dat� contains the fitting parameters for each point,

1775

2298

�validx.dat/.mat� contains the x-position of each peak, and �validy.dat/.mat�

1776

2299

contains the y-position of each peak) will be saved in the current folder. One

1777

2300

relevant parameter is not directly accessible since this approach is trying to

1789

2312

before these points are deleted, you can still play around with this value and

1790

2313

see how it affects your resulting validx and validy.<o:p></o:p>

1791

2314

1792

<span

1793

style='mso-ansi-language:EN-US'><o:p> </o:p>

1794

1795

<span

1796

style='mso-ansi-language:EN-US'><o:p> </o:p>

1797

1798

<b

1799

style='mso-bidi-font-weight:normal'>�pickpeak.m�<span

1800

style='mso-ansi-language:EN-US'><o:p></o:p>

1801

1802

<span

1803

style='mso-ansi-language:EN-US'>After starting the function by typing at the

1804

console �pickpeak;�, the function will ask you for the first image and then

1805

will need to know how many peaks you want to identify.<o:p></o:p>

1806

1807

<span

1808

style='mso-ansi-language:EN-US'><o:p> </o:p>

1809

1810

<span

1811

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1045"

2315

<span

2316

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2317

2318

<span

2319

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2320

2321

<b

2322

style='mso-bidi-font-weight:normal'><span lang=EN-US style='mso-ansi-language:

2323

EN-US'>�pickpeak.m�<o:p></o:p>

2324

2325

<span

2326

lang=EN-US style='mso-ansi-language:EN-US'>After starting the function by

2327

typing at the console �pickpeak;�, the function will ask you for the first

2328

image and then will need to know how many peaks you want to identify.<o:p></o:p>

2329

2330

<span

2331

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2332

2333

<span

2334

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1050"

1812

2335

type="#_x0000_t75" style='width:242.25pt;height:1in'>

1813

<v:imagedata src="Correlation_Guide_2_files/image031.jpg" o:title="pickpeak01"

1814

cropbottom="50395f" cropright="27230f"/>

2336

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image036.jpg"

2337

o:title="pickpeak01"/>

1815

2338

</v:shape><![endif]--><![if !vml]><img border=0 width=323 height=96

1816

src="Correlation_Guide_2_files/image032.jpg" v:shapes="_x0000_i1045"><![endif]><o:p></o:p>

1817

1818

<span

2339

src="Correlation_Tracking_Guide_2010-Dateien/image036.jpg" v:shapes="_x0000_i1050"><![endif]><o:p></o:p>

2340

2341

<span

2342

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2343

2344

<span lang=EN-US

2345

style='mso-ansi-language:EN-US'>Fig. : How many peaks do you want to identify

2346

for tracking by �pickpeak.m�?<o:p></o:p>

2347

2348

<span lang=EN-US

1819

2349

style='mso-ansi-language:EN-US'><o:p> </o:p>

1820

2350

1821

<span style='mso-ansi-language:

1822

EN-US'>Fig. : How many peaks do you want to identify for tracking by

1823

�pickpeak.m�?<o:p></o:p>

1824

1825

<span style='mso-ansi-language:

1826

EN-US'><o:p> </o:p>

1827

1828

<span

1829

style='mso-ansi-language:EN-US'>After you typed in a number (e.g. 20), the

1830

function will present you the selected image and you can click boxes around the

1831

peaks you want to track. For each peak you have to define a box by clicking on

1832

the lower left and the upper right of each peak. The center of each box will be

1833

highlighted by a blue circle. It is very important that you choose a box which

1834

is wide enough for the curve fitting to get enough data points. But if you

1835

choose too big boxes you will trap several peaks in them and the residual of

1836

the fit will be high which the software will interpret as bad fit. A box size

1837

of 2-4 times of the visible peaks seems to be a good idea. Also it is better to

1838

choose round shaped peaks since this provides a better greyscale profile if you

1839

choose to use a gauss function for the fitting process. <o:p></o:p>

1840

1841

<span

1842

style='mso-ansi-language:EN-US'>After you picked all peaks, the software will

1843

fit all peaks which will be displayed in a small window and after the first

1844

image processed you will only see the actual image and with blue circles on top

1845

indicating the peaks which are still in the fitting process. Vanishing circles

1846

indicate that the peak could not be fitted any more.<span

2351

<span

2352

lang=EN-US style='mso-ansi-language:EN-US'>After you typed in a number (e.g.

2353

20), the function will present you the selected image and you can click boxes

2354

around the peaks you want to track. For each peak you have to define a box by

2355

clicking on the lower left and the upper right of each peak. The center of each

2356

box will be highlighted by a blue circle. It is very important that you choose

2357

a box which is wide enough for the curve fitting to get enough data points. But

2358

if you choose too big boxes you will trap several peaks in them and the residual

2359

of the fit will be high which the software will interpret as bad fit. A box

2360

size of 2-4 times of the visible peaks seems to be a good idea. Also it is

2361

better to choose round shaped peaks since this provides a better greyscale

2362

profile if you choose to use a gauss function for the fitting process. <o:p></o:p>

2363

2364

<span

2365

lang=EN-US style='mso-ansi-language:EN-US'>After you picked all peaks, the

2366

software will fit all peaks which will be displayed in a small window and after

2367

the first image processed you will only see the actual image and with blue

2368

circles on top indicating the peaks which are still in the fitting process.

2369

Vanishing circles indicate that the peak could not be fitted any more.<span

1847

2370

style='mso-spacerun:yes'>� The title in this window will tell you the

1848

2371

approximated total processing time and how much percent of the images are

1849

2372

processed. <o:p></o:p>

1850

2373

1851

<span

1852

style='mso-ansi-language:EN-US'>After all images are processed, the data will

1853

be saved the same way as in the �peak_labelling.m� function. <o:p></o:p>

1854

1855

<span

1856

style='mso-ansi-language:EN-US'><o:p> </o:p>

1857

1858

<b

1859

style='mso-bidi-font-weight:normal'>�strain_lineprofile.m�<o:p></o:p>

1860

1861

<span

1862

style='mso-ansi-language:EN-US'>This function will track two greyscale maxima

1863

in a line profile which you can choose from an image. After opening the first

1864

image, the software will let you to choose a horizontal line at a vertical

1865

position in the image. The next dialog will ask you which integration width (in

1866

vertical, y-direct) you want to use. Default is 40 but you should keep in mind

1867

that it should be either much wider or much narrower than your markers. If you

1868

choose the same width and the markers are drifting in y direction the peaks in

1869

the greyscale profile will change which will translate as error into your

1870

strain analysis. <o:p></o:p>

1871

1872

<span

1873

style='mso-ansi-language:EN-US'>The calculated greyscale profile will then be

1874

plotted and you can choose two peaks. The first click should be located on the

1875

horizontal level of the background and the vertical position of the first peak

1876

and the second click should be placed at the horizontal level of the average

1877

peak amplitude of the two chosen peaks and the vertical position of the second

1878

peak. After the second click, the function will fit two gauss functions to the

1879

greyscale profile and plot a red fitting function on top of the data while

1880

processing all images. The peak positions will be saved in the file

1881

�raw_peak_results.dat� and the strain as strain_x.dat as well as a two column

1882

file with the image number in the first column and the strain in the second

1883

column. All files are tab delimited ASCII format and can be opened e.g. with

1884

excel. You cannot use �displacement.m� for the strain analysis since this data

1885

is only 1D with 2 points.<o:p></o:p>

1886

1887

<span

1888

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1044"

2374

<span

2375

lang=EN-US style='mso-ansi-language:EN-US'>After all images are processed, the data

2376

will be saved the same way as in the �peak_labelling.m� function. <o:p></o:p>

2377

2378

<span

2379

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2380

2381

<b

2382

style='mso-bidi-font-weight:normal'><span lang=EN-US style='mso-ansi-language:

2383

EN-US'>�strain_lineprofile.m�<o:p></o:p>

2384

2385

<span

2386

lang=EN-US style='mso-ansi-language:EN-US'>This function will track two

2387

greyscale maxima in a line profile which you can choose from an image. After

2388

opening the first image, the software will let you to choose a horizontal line

2389

at a vertical position in the image. The next dialog will ask you which

2390

integration width (in vertical, y-direct) you want to use. Default is 40 but

2391

you should keep in mind that it should be either much wider or much narrower

2392

than your markers. If you choose the same width and the markers are drifting in

2393

y direction the peaks in the greyscale profile will change which will translate

2394

as error into your strain analysis. <o:p></o:p>

2395

2396

<span

2397

lang=EN-US style='mso-ansi-language:EN-US'>The calculated greyscale profile

2398

will then be plotted and you can choose two peaks. The first click should be

2399

located on the horizontal level of the background and the vertical position of

2400

the first peak and the second click should be placed at the horizontal level of

2401

the average peak amplitude of the two chosen peaks and the vertical position of

2402

the second peak. After the second click, the function will fit two gauss

2403

functions to the greyscale profile and plot a red fitting function on top of

2404

the data while processing all images. The peak positions will be saved in the

2405

file �raw_peak_results.dat� and the strain as strain_x.dat as well as a two

2406

column file with the image number in the first column and the strain in the

2407

second column. All files are tab delimited ASCII format and can be opened e.g.

2408

with excel. You cannot use �displacement.m� for the strain analysis since this

2409

data is only 1D with 2 points.<o:p></o:p>

2410

2411

<span

2412

lang=EN-US style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1051"

1889

2413

type="#_x0000_t75" style='width:414.75pt;height:345pt'>

1890

<v:imagedata src="Correlation_Guide_2_files/image033.jpg" o:title="line_profile"

1891

cropbottom="1593f"/>

2414

<v:imagedata src="Correlation_Tracking_Guide_2010-Dateien/image037.jpg"

2415

o:title="line_profile"/>

1892

2416

</v:shape><![endif]--><![if !vml]><img border=0 width=553 height=460

1893

src="Correlation_Guide_2_files/image034.jpg" v:shapes="_x0000_i1044"><![endif]><o:p></o:p>

1894

1895

<span

1896

style='mso-ansi-language:EN-US'><o:p> </o:p>

1897

1898

<span

1899

style='mso-ansi-language:EN-US'>Fig. : Greyscale lineprofile, ready to pick two

1900

peaks.<o:p></o:p>

1901

1902

<span

1903

style='mso-ansi-language:EN-US'><o:p> </o:p>

1904

1905

<p class=MsoNormal style='margin-left:.5in;text-align:justify;text-indent:-.25in;

1906

mso-list:l3 level1 lfo4;tab-stops:list .5in'><![if !supportLists]><span

1907

style='font-size:16.0pt;mso-ansi-language:EN-US'>3.<span

1908

style='font:7.0pt "Times New Roman"'>    <![endif]><span

1909

style='font-size:16.0pt;mso-ansi-language:EN-US'>Run displacement.m:<o:p></o:p>

1910

1911

<span

1912

style='mso-ansi-language:EN-US'><o:p> </o:p>

1913

1914

<span

1915

style='mso-ansi-language:EN-US'>Please check step 4 in �4. Digital Image

1916

Correlation Quick Guide�.<o:p></o:p>

1917

1918

<span style='font-size:18.0pt;font-family:"Times New Roman";mso-fareast-font-family:

1919

"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:DE;mso-bidi-language:

1920

AR-SA'>

2417

src="Correlation_Tracking_Guide_2010-Dateien/image037.jpg" v:shapes="_x0000_i1051"><![endif]><o:p></o:p>

2418

2419

<span

2420

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2421

2422

<span

2423

lang=EN-US style='mso-ansi-language:EN-US'>Fig. : Greyscale lineprofile, ready

2424

to pick two peaks.<o:p></o:p>

2425

2426

<span

2427

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2428

2429

<p class=MsoNormal style='margin-left:36.0pt;text-align:justify;text-indent:

2430

-18.0pt;mso-list:l3 level1 lfo4;tab-stops:list 36.0pt'><![if !supportLists]><span

2431

lang=EN-US style='font-size:16.0pt;mso-ansi-language:EN-US'><span

2432

style='mso-list:Ignore'>3.

2433

<![endif]><span lang=EN-US style='font-size:16.0pt;

2434

mso-ansi-language:EN-US'>Run displacement.m:<o:p></o:p>

2435

2436

<span

2437

lang=EN-US style='mso-ansi-language:EN-US'><o:p> </o:p>

2438

2439

<span

2440

lang=EN-US style='mso-ansi-language:EN-US'>Please check step 4 in �4. Digital

2441

Image Correlation Quick Guide�.<o:p></o:p>

2442

2443

<span lang=EN-US style='font-size:18.0pt;font-family:"Times New Roman","serif";

2444

mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:

2445

DE;mso-bidi-language:AR-SA'>

1921

2446

1922

2447

1923

<span style='font-size:18.0pt;

1924

mso-ansi-language:EN-US'>6. Extra scripts and information you might find useful<o:p></o:p>

1925

1926

<span style='mso-ansi-language:

1927

EN-US'><o:p> </o:p>

1928

1929

<span style='mso-ansi-language:

1930

EN-US'><o:p> </o:p>

1931

1932

<b style='mso-bidi-font-weight:

1933

normal'>�stress_strainmatch.m�<span

1934

style='mso-ansi-language:EN-US'>:<o:p></o:p>

1935

1936

<span style='mso-ansi-language:

1937

EN-US'>Matching stress and strain can become a pain if they were captured with

1938

different programs and/or computers, which can be the case if the strain is

1939

captured with a camera. This little script can read in stress and strain files

1940

(as long as they are ASCII files) and match the two together. It needs the �time_image.txt�

1941

which is created by the �filelist_generator.m�, the strain file and the stress

1942

file. You have to choose which column is stress and strain in each file. After

1943

it has loaded all the files the script will ask you for the time between

1944

starting the stress measurement and the first image file. The stress versus

1945

image plot shows you immediately if the chosen value makes sense and the file �stress_image_x.txt�

1946

will be written to the �Current Folder� on the hard disk.<o:p></o:p>

1947

1948

<span style='mso-ansi-language:

1949

EN-US'><o:p> </o:p>

1950

1951

<b style='mso-bidi-font-weight:

1952

normal'>�Markerplotting.m�<span

1953

style='mso-ansi-language:EN-US'>:<o:p></o:p>

1954

1955

<span style='mso-ansi-language:

1956

EN-US'>This script will plot the markers as small dots onto the analyzed

1957

images. You have to provide validx.m, validy.m, filenamelist and the images in the

1958

�Current Folder�. After staring the script you will be asked if you want to

1959

create a video or not. If you click �yes� a folder �Video_Markers� will be

1960

created and each frame captured as a *.jpg file.<o:p></o:p>

1961

1962

<span style='mso-ansi-language:

1963

EN-US'><o:p> </o:p>

1964

1965

<b style='mso-bidi-font-weight:

1966

normal'>�resume_automate_image.m�:<o:p></o:p>

1967

1968

<span style='mso-ansi-language:

1969

EN-US'>This function allows you to resume automate_image jobs after they were

1970

stopped by the user or out of other reasons (windows decided that it is more

1971

important to install an update than running the job�). You need

1972

�resultsimcorrx.txt� and �resultsimcorrx.txt� as well as �grid_x.dat� and

1973

�grid_y.dat� and �filenamelist� in the same folder as your images you want to

1974

continue to process. Your Current Directory should be the same. You can start

1975

the function for example by typing �[validx, validy]=resume_automate_image;� at

1976

the command line of matlab and then press ENTER. <o:p></o:p>

1977

1978

<b style='mso-bidi-font-weight:

1979

normal'><o:p> </o:p>

1980

1981

<b style='mso-bidi-font-weight:

1982

normal'>�jobskript.m�<span

1983

style='mso-ansi-language:EN-US'><o:p></o:p>

1984

1985

<span style='mso-ansi-language:

1986

EN-US'>This script allows you to create a list of automate_image jobs and

1987

executes them by the use of the automate_image function. It combines the first

1988

3 steps of the Correlation quick guide described in chapter 4. The script calls

1989

first the �filelist_generator� and let you store the created file list in the folder

1990

with the images. After that the script calls the �grid_generator� and stores

1991

�grid_x.dat� and �grid_y.dat� in the same folder. You can then store the job

1992

folder by clicking on the �Save� button and then proceed either with the job or

1993

create another one. You can also load stored jobs at the beginning. If you

1994

decide not to add any more jobs (click �No�) the script will give the folders

1995

one by one to �automate_image.m�.<o:p></o:p>

1996

1997

<b style='mso-bidi-font-weight:

1998

normal'><o:p> </o:p>

1999

2000

<b style='mso-bidi-font-weight:

2001

normal'>�RTCorrCode.m�<o:p></o:p>

2002

2003

<span style='mso-ansi-language:

2004

EN-US'>This function allows to process images and calculate x- and y-strain

2005

while you take them by dynamically generating a filenamelist and reading in the

2006

files. For real time image correlation you have to find out by try and error

2007

how many markers your computer can process per second. This depends on image

2008

file size, Corrsize (which you can change in �cpcorr.m�) and on the speed of

2009

your computer and how many other things it has to do besides the processing of

2010

images. <o:p></o:p>

2011

2012

<span style='mso-ansi-language:

2013

EN-US'>You can use a dedicated machine by getting your image files through a

2014

network connection and give back the strain as a voltage by a data acquisition

2015

board to the measurement computer. <o:p></o:p>

2016

2017

<span style='mso-ansi-language:

2018

EN-US'>You can either choose to let the computer stop the processing if the

2019

next image cannot be found or by the existence of a file �end.txt� in the same

2020

directory as the image files.<o:p></o:p>

2021

2022

<span style='mso-ansi-language:

2023

EN-US'>To start the function you can type [validx,validy]=RTCorrCode; and then

2024

press ENTER. First you will be asked if you want to stop processing if the

2025

function cannot find a consecutively numbered image or in case the function

2026

finds �end.txt� in the �Current Folder�. If you want to use RTCorrCode just to

2027

process your images you can click �Stop with image check� and the function will

2028

process all images in your folder with consecutive numbers in the image file

2029

name before the point (e.g. PIC00300.Tif). If you want to process the images on

2030

the fly you should click on �Stop with end.txt�. The function will then process

2031

all images and wait for the next one to process until a file �end.txt� exists

2032

in the folder. To stop the function just create a text file with that name in

2033

the folder. After choosing the mode, the following dialog will ask you for the

2034

first image to process which you have to select.<o:p></o:p>

2035

2036

<span style='mso-ansi-language:

2037

EN-US'><o:p> </o:p>

2038

2039

<span

2040

style='mso-ansi-language:EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1046"

2041

type="#_x0000_t75" style='width:252pt;height:164.25pt'>

2042

<v:imagedata src="Correlation_Guide_2_files/image007.jpg" o:title="grid_generator_1"

2043

cropbottom="30952f" cropright="25789f"/>

2044

</v:shape><![endif]--><![if !vml]><img border=0 width=336 height=219

2045

src="Correlation_Guide_2_files/image035.jpg" v:shapes="_x0000_i1046"><![endif]><o:p></o:p>

2046

2047

<span style='mso-ansi-language:

2048

EN-US'><o:p> </o:p>

2049

2050

<span style='mso-ansi-language:

2051

EN-US'>Fig. Open the first image for RTCorrCode.<o:p></o:p>

2052

2053

<b style='mso-bidi-font-weight:

2054

normal'><o:p> </o:p>

2055

2056

<span style='mso-ansi-language:

2057

EN-US'>The file you select here will be used to calculate all consecutive file

2058

names to process all the images in the folder. If there is file missing the

2059

code will not proceed. <o:p></o:p>

2060

2061

<span style='mso-ansi-language:

2062

EN-US'>After selecting the first image, RTCorrCode will call the �grid_generator.m�

2063

and allow you to choose a grid (see Chapt. 4 for grid_generator.m).

2064

Alternatively you can preselect a grid and hand it over to the function by

2065

starting it with �[validx,validy]=RTCorrCode(grid_x, grid_y);�. This can be

2066

handy if you always run the same samples with the same grid on it. Otherwise

2067

you can now select the grid and the function will process the first image and

2068

show a rough estimate of the frames per seconds your computer will be able to

2069

process. If you select the chosen grid, the function will now search for the

2070

next image and correlate it. After correlating the second image RTCorrCode will

2071

show a window with 4 subplots. The one in the upper left corner shows the

2072

actual image and the red crosses are the equivalent of the marker positions.

2073

The upper right diagram shows the displacement vs. marker position and the

2074

linear fit in x-direction while the lower right diagram shows the same in

2075

y-direction. Last but not least, the lower left subplot shows the x- and

2076

y-strain versus image number, where blue is x- and green is y-direction.<o:p></o:p>

2077

2078

<span style='mso-ansi-language:

2079

EN-US'>RTCorrCode will leave the following files in the Current Folder:

2080

grid_x.dat, grid_y.dat (saved by grid_generator), resultsimcorrx.txt and

2081

resultsimcorry.txt (which are saved after each processed image) and validx.dat

2082

and validy.dat (after RTCorrCode.m stopped).<o:p></o:p>

2083

2084

<span style='mso-ansi-language:

2085

EN-US'><o:p> </o:p>

2086

2087

<span style='mso-ansi-language:

2088

EN-US'><!--[if gte vml 1]><v:shape id="_x0000_i1047" type="#_x0000_t75"

2089

style='width:414.75pt;height:303pt'>

2090

<v:imagedata src="Correlation_Guide_2_files/image036.jpg" o:title="RTCorrCode"/>

2091

</v:shape><![endif]--><![if !vml]><img border=0 width=553 height=404

2092

src="Correlation_Guide_2_files/image037.jpg" v:shapes="_x0000_i1047"><![endif]><o:p></o:p>

2093

2094

<b style='mso-bidi-font-weight:

2095

normal'><o:p> </o:p>

2096

2097

<span style='mso-ansi-language:

2098

EN-US'>Fig. RTCorrCode will show a window with 4 subplots. The one in the upper

2099

left corner shows the actual image and the red crosses are the equivalent of

2100

the marker positions. The upper right diagram shows the displacement vs. marker

2101

position and the linear fit in x-direction while the lower right diagram shows

2102

the same in y-direction. Last but not least, the lower left subplot shows the

2103

x- and y-strain versus image number, where blue is x- and green is y-direction.<o:p></o:p>

2104

2105

<span style='mso-ansi-language:

2106

EN-US'><o:p> </o:p>

2107

2108

<span style='mso-ansi-language:

2109

EN-US'><o:p> </o:p>

2110

2111

<b style='mso-bidi-font-weight:

2112

normal'><o:p> </o:p>

2113

2114

<b style='mso-bidi-font-weight:

2115

normal'>Input and output files:<o:p></o:p>

2116

2117

<b style='mso-bidi-font-weight:

2118

normal'>Image files<span

2119

style='mso-ansi-language:EN-US'> should be 8 bit greyscale Tiff (*.tif) images

2120

and should be named with a increasing number at the end. <o:p></o:p>

2121

2122

<span style='mso-ansi-language:

2123

EN-US'>If you want to use �filelist_generator.m�, the filename should be

2124

something like �PIC0� or� �PIC1� plus the

2125

number at the end scaling from �0001� to�

2126

�9999�. The full name would be for the first file �PIC10001.tif�. If you

2127

need to process more than 9999 image then you have to modify

2128

�filelist_generator.m� or write an email to us. The <b style='mso-bidi-font-weight:

2129

normal'>�filenamelist.mat� is a matlab file since it was easier to combine

2130

text and numbers into one file by just saving it in this format. <o:p></o:p>

2131

2132

<b style='mso-bidi-font-weight:

2133

normal'>�time_image.txt�<span

2134

style='mso-ansi-language:EN-US'> contains the time the image was captured.

2135

Please keep in mind that using other software to change the name or the format

2136

after capturing the images can lead to a change of the date and capturing time

2137

of the images. It happens that the software will change the name of the images

2138

and the new creation date and time of each image will be the time it was

2139

renamed. Programs like Irfanview have the option to preserve the original time

2140

of the images. This option has to be checked to make sure you can match stress

2141

and strain at the end of your analysis.<o:p></o:p>

2142

2143

<b style='mso-bidi-font-weight:

2144

normal'>�grid_x.dat�<span

2145

style='mso-ansi-language:EN-US'> and �grid_y.dat�

2146

are the files containing the x- and y-pixel position of the starting grid

2147

created by the �grid_generator.m� function. If you want to create your own

2148

grids, you can do that with excel and save them as tab delimited ASCII files.

2149

Both files can be organized as column vectors or matrices, as long as they are

2150

equal. <o:p></o:p>

2151

2152

<b style='mso-bidi-font-weight:

2153

normal'>�validx.dat�<span

2154

style='mso-ansi-language:EN-US'> and �vaildy.dat�

2155

are both ASCII formatted tab delimited files which contain in columns the

2156

position of each marker for each image. <o:p></o:p>

2157

2158

<b style='mso-bidi-font-weight:

2159

normal'>�fitxy.dat�<span

2160

style='mso-ansi-language:EN-US'> will be only saved if you use

2448

<span lang=EN-US

2449

style='font-size:18.0pt;mso-ansi-language:EN-US'>6. Extra scripts and

2450

information you might find useful<o:p></o:p>

2451

2452

<span lang=EN-US

2453

style='mso-ansi-language:EN-US'><o:p> </o:p>

2454

2455

<span lang=EN-US

2456

style='mso-ansi-language:EN-US'><o:p> </o:p>

2457

2458

<b style='mso-bidi-font-weight:

2459

normal'>�stress_strainmatch.m�<span

2460

lang=EN-US style='mso-ansi-language:EN-US'>:<o:p></o:p>

2461

2462

<span lang=EN-US

2463

style='mso-ansi-language:EN-US'>Matching stress and strain can become a pain if

2464

they were captured with different programs and/or computers, which can be the

2465

case if the strain is captured with a camera. This little script can read in

2466

stress and strain files (as long as they are ASCII files) and match the two

2467

together. It needs the �time_image.txt� which is created by the �filelist_generator.m�,

2468

the strain file and the stress file. You have to choose which column is stress

2469

and strain in each file. After it has loaded all the files the script will ask

2470

you for the time between starting the stress measurement and the first image

2471

file. The stress versus image plot shows you immediately if the chosen value

2472

makes sense and the file �stress_image_x.txt� will be written to the �Current

2473

Folder� on the hard disk.<o:p></o:p>

2474

2475

<span lang=EN-US

2476

style='mso-ansi-language:EN-US'><o:p> </o:p>

2477

2478

<b style='mso-bidi-font-weight:

2479

normal'>�Markerplotting.m�<span

2480

lang=EN-US style='mso-ansi-language:EN-US'>:<o:p></o:p>

2481

2482

<span lang=EN-US

2483

style='mso-ansi-language:EN-US'>This script will plot the markers as small dots

2484

onto the analyzed images. You have to provide validx.m, validy.m, filenamelist

2485

and the images in the �Current Folder�. After staring the script you will be

2486

asked if you want to create a video or not. If you click �yes� a folder �Video_Markers�

2487

will be created and each frame captured as a *.jpg file.<o:p></o:p>

2488

2489

<span lang=EN-US

2490

style='mso-ansi-language:EN-US'><o:p> </o:p>

2491

2492

<b style='mso-bidi-font-weight:

2493

normal'>Input and output

2494

files:<o:p></o:p>

2495

2496

<b style='mso-bidi-font-weight:

2497

normal'>Image files<span

2498

lang=EN-US style='mso-ansi-language:EN-US'> should be 8 bit greyscale Tiff

2499

(*.tif) images and should be named with a increasing number at the end. <o:p></o:p>

2500

2501

<span lang=EN-US

2502

style='mso-ansi-language:EN-US'>If you want to use �filelist_generator.m�, the

2503

filename should be something like �PIC0� or�

2504

�PIC1� plus the number at the end scaling from �0001� to<span

2505

style='mso-spacerun:yes'>� �9999�. The full name would be for the first

2506

file �PIC10001.tif�. If you need to process more than 9999 image then you have

2507

to modify �filelist_generator.m� or write an email to us. The <b

2508

style='mso-bidi-font-weight:normal'>�filenamelist.mat� is a matlab file

2509

since it was easier to combine text and numbers into one file by just saving it

2510

in this format. <o:p></o:p>

2511

2512

<b style='mso-bidi-font-weight:

2513

normal'>�time_image.txt�<span

2514

lang=EN-US style='mso-ansi-language:EN-US'> contains the time the image was

2515

captured. Please keep in mind that using other software to change the name or

2516

the format after capturing the images can lead to a change of the date and

2517

capturing time of the images. It happens that the software will change the name

2518

of the images and the new creation date and time of each image will be the time

2519

it was renamed. Programs like Irfanview have the option to preserve the

2520

original time of the images. This option has to be checked to make sure you can

2521

match stress and strain at the end of your analysis.<o:p></o:p>

2522

2523

<b style='mso-bidi-font-weight:

2524

normal'>�grid_x.dat�<span

2525

lang=EN-US style='mso-ansi-language:EN-US'> and <b style='mso-bidi-font-weight:

2526

normal'>�grid_y.dat� are the files containing the x- and y-pixel position

2527

of the starting grid created by the �grid_generator.m� function. If you want to

2528

create your own grids, you can do that with excel and save them as tab

2529

delimited ASCII files. Both files can be organized as column vectors or

2530

matrices, as long as they are equal. <o:p></o:p>

2531

2532

<b style='mso-bidi-font-weight:

2533

normal'>�validx.dat�<span

2534

lang=EN-US style='mso-ansi-language:EN-US'> and <b style='mso-bidi-font-weight:

2535

normal'>�vaildy.dat� are both ASCII formatted tab delimited files which

2536

contain in columns the position of each marker for each image. <o:p></o:p>

2537

2538

<b style='mso-bidi-font-weight:

2539

normal'>�fitxy.dat�<span

2540

lang=EN-US style='mso-ansi-language:EN-US'> will be only saved if you use

2161

2541

�peak_labelling.m� or �pickpeak.m� and contains all fitting parameters for each

2162

2542

peak. <o:p></o:p>

2163

2543

2164

<span style='font-size:12.0pt;font-family:"Times New Roman";mso-fareast-font-family:

2165

"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:DE;mso-bidi-language:

2166

AR-SA'>

2544

<span lang=EN-US style='font-size:12.0pt;font-family:"Times New Roman","serif";

2545

mso-fareast-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:

2546

DE;mso-bidi-language:AR-SA'>

2167

2547

2168

2548

2169

<span style='font-size:18.0pt;

2170

mso-bidi-font-size:12.0pt;mso-ansi-language:EN-US'>7. Acknowledgement<span

2171

style='mso-ansi-language:EN-US'><o:p></o:p>

2172

2173

<span style='mso-ansi-language:

2174

EN-US'><o:p> </o:p>

2175

2176

<span style='mso-ansi-language:

2177

EN-US'>Prof. W. N. Sharpe J. provided some helpful hints what would be

2178

important to the user and what would be a waste of time ;-). I want to

2179

acknowledge him since it is always a pleasure to work in his lab at the JHU. <o:p></o:p>

2180

2181

<span style='mso-ansi-language:

2182

EN-US'>�<o:p></o:p>

2549

<span lang=EN-US

2550

style='font-size:18.0pt;mso-bidi-font-size:12.0pt;mso-ansi-language:EN-US'>7.

2551

Acknowledgement<o:p></o:p>

2552

2553

<span lang=EN-US

2554

style='mso-ansi-language:EN-US'><o:p> </o:p>

2555

2556

<span lang=EN-US

2557

style='mso-ansi-language:EN-US'>Prof. W. N. Sharpe J. provided some helpful

2558

hints what would be important to the user and what would be a waste of time

2559

;-). I want to acknowledge him since it is always a pleasure to work in his lab

2560

at the JHU. <o:p></o:p>

2561

2562

<span lang=EN-US

2563

style='mso-ansi-language:EN-US'>We got� a

2564

lot of help from all our colleagues off our near and far communities and we do

2565

appreciate this a lot. Please comment on our Mathworks site if you need

2566

something or if you think this tool works as it should.<o:p></o:p>

2183

2567

2184

2568

</div>

2185

2569

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