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-rw-r--r--include/astra/FanFlatBeamLineKernelProjector2D.inl156
1 files changed, 59 insertions, 97 deletions
diff --git a/include/astra/FanFlatBeamLineKernelProjector2D.inl b/include/astra/FanFlatBeamLineKernelProjector2D.inl
index 1676cb1..23438fb 100644
--- a/include/astra/FanFlatBeamLineKernelProjector2D.inl
+++ b/include/astra/FanFlatBeamLineKernelProjector2D.inl
@@ -25,9 +25,7 @@ along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
$Id$
*/
-
-
-using namespace astra;
+#define policy_weight(p,rayindex,volindex,weight) if (p.pixelPrior(volindex)) { p.addWeight(rayindex, volindex, weight); p.pixelPosterior(volindex); }
template <typename Policy>
void CFanFlatBeamLineKernelProjector2D::project(Policy& p)
@@ -55,12 +53,6 @@ void CFanFlatBeamLineKernelProjector2D::projectSingleRay(int _iProjection, int _
template <typename Policy>
void CFanFlatBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
{
- // variables
- float32 detX, detY, S, T, I, x, y, c, r, update_c, update_r, offset;
- float32 lengthPerRow, lengthPerCol, inv_pixelLengthX, inv_pixelLengthY, invTminSTimesLengthPerRow, invTminSTimesLengthPerCol;
- int iVolumeIndex, iRayIndex, row, col, iAngle, iDetector, colCount, rowCount, detCount;
- const SFanProjection * proj = 0;
-
// get vector geometry
const CFanFlatVecProjectionGeometry2D* pVecProjectionGeometry;
if (dynamic_cast<CFanFlatProjectionGeometry2D*>(m_pProjectionGeometry)) {
@@ -70,16 +62,26 @@ void CFanFlatBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, in
}
// precomputations
- inv_pixelLengthX = 1.0f / m_pVolumeGeometry->getPixelLengthX();
- inv_pixelLengthY = 1.0f / m_pVolumeGeometry->getPixelLengthY();
- colCount = m_pVolumeGeometry->getGridColCount();
- rowCount = m_pVolumeGeometry->getGridRowCount();
- detCount = pVecProjectionGeometry->getDetectorCount();
+ const float32 pixelLengthX = m_pVolumeGeometry->getPixelLengthX();
+ const float32 pixelLengthY = m_pVolumeGeometry->getPixelLengthY();
+ const float32 inv_pixelLengthX = 1.0f / pixelLengthX;
+ const float32 inv_pixelLengthY = 1.0f / pixelLengthY;
+ const int colCount = m_pVolumeGeometry->getGridColCount();
+ const int rowCount = m_pVolumeGeometry->getGridRowCount();
+ const int detCount = pVecProjectionGeometry->getDetectorCount();
+ const float32 Ex = m_pVolumeGeometry->getWindowMinY() + pixelLengthX*0.5f;
+ const float32 Ey = m_pVolumeGeometry->getWindowMaxY() - pixelLengthY*0.5f;
// loop angles
- for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
+ #pragma omp parallel for
+ for (int iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
+
+ // variables
+ float32 Dx, Dy, Rx, Ry, S, T, weight, c, r, deltac, deltar, offset, RxOverRy, RyOverRx;
+ float32 lengthPerRow, lengthPerCol, invTminSTimesLengthPerRow, invTminSTimesLengthPerCol;
+ int iVolumeIndex, iRayIndex, row, col, iDetector;
- proj = &pVecProjectionGeometry->getProjectionVectors()[iAngle];
+ const SFanProjection * proj = &pVecProjectionGeometry->getProjectionVectors()[iAngle];
// loop detectors
for (iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) {
@@ -89,156 +91,116 @@ void CFanFlatBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, in
// POLICY: RAY PRIOR
if (!p.rayPrior(iRayIndex)) continue;
- detX = proj->fDetSX + (iDetector+0.5f) * proj->fDetUX;
- detY = proj->fDetSY + (iDetector+0.5f) * proj->fDetUY;
+ Dx = proj->fDetSX + (iDetector+0.5f) * proj->fDetUX;
+ Dy = proj->fDetSY + (iDetector+0.5f) * proj->fDetUY;
- float32 fRayX = proj->fSrcX - detX;
- float32 fRayY = proj->fSrcY - detY;
+ Rx = proj->fSrcX - Dx;
+ Ry = proj->fSrcY - Dy;
- bool vertical = fabs(fRayX) < fabs(fRayY);
+ bool vertical = fabs(Rx) < fabs(Ry);
if (vertical) {
- lengthPerRow = m_pVolumeGeometry->getPixelLengthX() * sqrt(fRayY*fRayY + fRayX*fRayX) / abs(fRayY);
- update_c = -m_pVolumeGeometry->getPixelLengthY() * (fRayX/fRayY) * inv_pixelLengthX;
- S = 0.5f - 0.5f*fabs(fRayX/fRayY);
- T = 0.5f + 0.5f*fabs(fRayX/fRayY);
+ RxOverRy = Rx/Ry;
+ lengthPerRow = pixelLengthX * sqrt(Rx*Rx + Ry*Ry) / abs(Ry);
+ deltac = -pixelLengthY * RxOverRy * inv_pixelLengthX;
+ S = 0.5f - 0.5f*fabs(RxOverRy);
+ T = 0.5f + 0.5f*fabs(RxOverRy);
invTminSTimesLengthPerRow = lengthPerRow / (T - S);
} else {
- lengthPerCol = m_pVolumeGeometry->getPixelLengthY() * sqrt(fRayY*fRayY + fRayX*fRayX) / abs(fRayX);
- update_r = -m_pVolumeGeometry->getPixelLengthX() * (fRayY/fRayX) * inv_pixelLengthY;
- S = 0.5f - 0.5f*fabs(fRayY/fRayX);
- T = 0.5f + 0.5f*fabs(fRayY/fRayX);
+ RyOverRx = Ry/Rx;
+ lengthPerCol = pixelLengthY * sqrt(Rx*Rx + Ry*Ry) / abs(Rx);
+ deltar = -pixelLengthX * RyOverRx * inv_pixelLengthY;
+ S = 0.5f - 0.5f*fabs(RyOverRx);
+ T = 0.5f + 0.5f*fabs(RyOverRx);
invTminSTimesLengthPerCol = lengthPerCol / (T - S);
}
+ bool isin = false;
+
// vertically
if (vertical) {
- // calculate x for row 0
- x = detX + (fRayX/fRayY)*(m_pVolumeGeometry->pixelRowToCenterY(0)-detY);
- c = (x - m_pVolumeGeometry->getWindowMinX()) * inv_pixelLengthX - 0.5f;
+ // calculate c for row 0
+ c = (Dx + (Ey - Dy)*RxOverRy - Ex) * inv_pixelLengthX;
// for each row
- for (row = 0; row < rowCount; ++row, c += update_c) {
+ for (row = 0; row < rowCount; ++row, c += deltac) {
col = int(c+0.5f);
+ if (col <= 0 || col >= colCount-1) { if (!isin) continue; else break; }
offset = c - float32(col);
- if (col <= 0 || col >= colCount-1) continue;
-
// left
if (offset < -S) {
- I = (offset + T) * invTminSTimesLengthPerRow;
+ weight = (offset + T) * invTminSTimesLengthPerRow;
iVolumeIndex = row * colCount + col - 1;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, lengthPerRow-weight)
iVolumeIndex++;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, I);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, weight)
}
// right
else if (S < offset) {
- I = (offset - S) * invTminSTimesLengthPerRow;
+ weight = (offset - S) * invTminSTimesLengthPerRow;
iVolumeIndex = row * colCount + col;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, lengthPerRow-weight)
iVolumeIndex++;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, I);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, weight)
}
// centre
else {
iVolumeIndex = row * colCount + col;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, lengthPerRow)
}
-
+ isin = true;
}
}
// horizontally
else {
- // calculate y for col 0
- y = detY + (fRayY/fRayX)*(m_pVolumeGeometry->pixelColToCenterX(0)-detX);
- r = (m_pVolumeGeometry->getWindowMaxY() - y) * inv_pixelLengthY - 0.5f;
+ // calculate r for col 0
+ r = -(Dy + (Ex - Dx)*RyOverRx - Ey) * inv_pixelLengthY;
// for each col
- for (col = 0; col < colCount; ++col, r += update_r) {
+ for (col = 0; col < colCount; ++col, r += deltar) {
int row = int(r+0.5f);
+ if (row <= 0 || row >= rowCount-1) { if (!isin) continue; else break; }
offset = r - float32(row);
- if (row <= 0 || row >= rowCount-1) continue;
-
// up
if (offset < -S) {
- I = (offset + T) * invTminSTimesLengthPerCol;
+ weight = (offset + T) * invTminSTimesLengthPerCol;
iVolumeIndex = (row-1) * colCount + col;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, lengthPerCol-weight)
iVolumeIndex += colCount;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, I);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, weight)
}
// down
else if (S < offset) {
- I = (offset - S) * invTminSTimesLengthPerCol;
+ weight = (offset - S) * invTminSTimesLengthPerCol;
iVolumeIndex = row * colCount + col;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, lengthPerCol-weight)
iVolumeIndex += colCount;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, I);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, weight)
}
// centre
else {
iVolumeIndex = row * colCount + col;
- // POLICY: PIXEL PRIOR + ADD + POSTERIOR
- if (p.pixelPrior(iVolumeIndex)) {
- p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol);
- p.pixelPosterior(iVolumeIndex);
- }
+ policy_weight(p, iRayIndex, iVolumeIndex, lengthPerCol)
}
-
+ isin = true;
}
}
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