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authorWillem Jan Palenstijn <Willem.Jan.Palenstijn@cwi.nl>2018-06-22 15:46:11 +0200
committerWillem Jan Palenstijn <Willem.Jan.Palenstijn@cwi.nl>2018-06-22 16:06:32 +0200
commite5b70e8b53e4ecc81b1aacc3af7893faf49ddc24 (patch)
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-/*
------------------------------------------------------------------------
-Copyright: 2010-2018, imec Vision Lab, University of Antwerp
- 2014-2018, CWI, Amsterdam
-
-Contact: astra@astra-toolbox.com
-Website: http://www.astra-toolbox.com/
-
-This file is part of the ASTRA Toolbox.
-
-
-The ASTRA Toolbox is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-The ASTRA Toolbox is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-
------------------------------------------------------------------------
-*/
-
-#include "algo.h"
-#include "fbp_filters.h"
-
-namespace astraCUDA {
-
-class _AstraExport FBP : public ReconAlgo {
-public:
- FBP();
- ~FBP();
-
- virtual bool useSinogramMask() { return false; }
- virtual bool useVolumeMask() { return false; }
-
- // Returns the required size of a filter in the fourier domain
- // when multiplying it with the fft of the projection data.
- // Its value is equal to the smallest power of two larger than
- // or equal to twice the number of detectors in the spatial domain.
- //
- // _iDetectorCount is the number of detectors in the spatial domain.
- static int calcFourierFilterSize(int _iDetectorCount);
-
- // Sets the filter type. Some filter types require the user to supply an
- // array containing the filter.
- // The number of elements in a filter in the fourier domain should be equal
- // to the value returned by calcFourierFilterSize().
- // The following types require a filter:
- //
- // - FILTER_PROJECTION:
- // The filter size should be equal to the output of
- // calcFourierFilterSize(). The filtered sinogram is
- // multiplied with the supplied filter.
- //
- // - FILTER_SINOGRAM:
- // Same as FILTER_PROJECTION, but now the filter should contain a row for
- // every projection direction.
- //
- // - FILTER_RPROJECTION:
- // The filter should now contain one kernel (= ifft of filter), with the
- // peak in the center. The filter width
- // can be any value. If odd, the peak is assumed to be in the center, if
- // even, it is assumed to be at floor(filter-width/2).
- //
- // - FILTER_RSINOGRAM
- // Same as FILTER_RPROJECTION, but now the supplied filter should contain a
- // row for every projection direction.
- //
- // A large number of other filters (FILTER_RAMLAK, FILTER_SHEPPLOGAN,
- // FILTER_COSINE, FILTER_HAMMING, and FILTER_HANN)
- // have a D variable, which gives the cutoff point in the frequency domain.
- // Setting this value to 1.0 will include the whole filter
- bool setFilter(astra::E_FBPFILTER _eFilter,
- const float * _pfHostFilter = NULL,
- int _iFilterWidth = 0, float _fD = 1.0f, float _fFilterParameter = -1.0f);
-
- bool setShortScan(bool ss) { m_bShortScan = ss; return true; }
-
- virtual bool init();
-
- virtual bool iterate(unsigned int iterations);
-
- virtual float computeDiffNorm() { return 0.0f; } // TODO
-
-protected:
- void reset();
-
- void* D_filter; // cufftComplex*
- bool m_bShortScan;
-};
-
-}