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-rw-r--r--include/astra/ParallelBeamLineKernelProjector2D.inl202
1 files changed, 199 insertions, 3 deletions
diff --git a/include/astra/ParallelBeamLineKernelProjector2D.inl b/include/astra/ParallelBeamLineKernelProjector2D.inl
index 199d69e..31aa138 100644
--- a/include/astra/ParallelBeamLineKernelProjector2D.inl
+++ b/include/astra/ParallelBeamLineKernelProjector2D.inl
@@ -29,8 +29,13 @@ $Id$
template <typename Policy>
void CParallelBeamLineKernelProjector2D::project(Policy& p)
{
- projectBlock_internal(0, m_pProjectionGeometry->getProjectionAngleCount(),
- 0, m_pProjectionGeometry->getDetectorCount(), p);
+ if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
+ projectBlock_internal(0, m_pProjectionGeometry->getProjectionAngleCount(),
+ 0, m_pProjectionGeometry->getDetectorCount(), p);
+ } else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
+ projectBlock_internal_vector(0, m_pProjectionGeometry->getProjectionAngleCount(),
+ 0, m_pProjectionGeometry->getDetectorCount(), p);
+ }
}
template <typename Policy>
@@ -49,7 +54,7 @@ void CParallelBeamLineKernelProjector2D::projectSingleRay(int _iProjection, int
//----------------------------------------------------------------------------------------
-// PROJECT BLOCK
+// PROJECT BLOCK - default projection geometry
template <typename Policy>
void CParallelBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
{
@@ -59,6 +64,11 @@ void CParallelBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, i
int iVolumeIndex, iRayIndex, row, col, iAngle, iDetector, x1;
bool switch_t;
+ float32 old_theta;
+ const SParProjection * proj = 0;
+
+ const CParallelProjectionGeometry2D* pProjectionGeometry = dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry);
+
// loop angles
for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
@@ -287,3 +297,189 @@ void CParallelBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, i
}
+//----------------------------------------------------------------------------------------
+// PROJECT BLOCK - vector projection geometry
+template <typename Policy>
+void CParallelBeamLineKernelProjector2D::projectBlock_internal_vector(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;
+
+ const SParProjection * proj = 0;
+ const CParallelVecProjectionGeometry2D* pVecProjectionGeometry = dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry);
+
+ inv_pixelLengthX = 1.0f / m_pVolumeGeometry->getPixelLengthX();
+ inv_pixelLengthY = 1.0f / m_pVolumeGeometry->getPixelLengthY();
+
+ // loop angles
+ for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
+
+ proj = &pVecProjectionGeometry->getProjectionVectors()[iAngle];
+
+ bool vertical = fabs(proj->fRayX) < fabs(proj->fRayY);
+ if (vertical) {
+ S = abs(0.5f * (1.0f - proj->fRayY/proj->fRayX));
+ T = abs(0.5f * (1.0f + proj->fRayY/proj->fRayX));
+ lengthPerRow = m_pVolumeGeometry->getPixelLengthX() * sqrt(proj->fRayY*proj->fRayY + proj->fRayX*proj->fRayX) / abs(proj->fRayY);
+ invTminSTimesLengthPerRow = lengthPerRow / (T - S);
+ } else {
+ S = abs(0.5f * (1.0f - proj->fRayX/proj->fRayY));
+ T = abs(0.5f * (1.0f + proj->fRayX/proj->fRayY));
+ lengthPerCol = m_pVolumeGeometry->getPixelLengthY() * sqrt(proj->fRayY*proj->fRayY + proj->fRayX*proj->fRayX) / abs(proj->fRayX);
+ invTminSTimesLengthPerCol = lengthPerCol / (T - S);
+ }
+
+ // loop detectors
+ for (iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) {
+
+ iRayIndex = iAngle * m_pProjectionGeometry->getDetectorCount() + iDetector;
+
+ // POLICY: RAY PRIOR
+ if (!p.rayPrior(iRayIndex)) continue;
+
+ detX = proj->fDetSX + (iDetector+0.5f) * proj->fDetUX;
+ detY = proj->fDetSY + (iDetector+0.5f) * proj->fDetUY;
+
+ // vertically
+ if (vertical) {
+
+ // calculate x for row 0
+ float32 x = detX + (proj->fRayX/proj->fRayY)*(m_pVolumeGeometry->pixelRowToCenterY(0)-detY);
+ float32 c = (x - m_pVolumeGeometry->getWindowMinX()) * inv_pixelLengthX - 0.5f;
+ float32 update_c = -m_pVolumeGeometry->getPixelLengthY() * (proj->fRayX/proj->fRayY) * inv_pixelLengthX;
+
+ // for each row
+ for (row = 0; row < m_pVolumeGeometry->getGridRowCount(); ++row, c += update_c) {
+
+ col = int(c+0.5f);
+ offset = c - float32(col);
+
+ if (col <= 0 || col >= m_pVolumeGeometry->getGridColCount()-1) continue;
+
+ // left
+ if (offset < -S) {
+ I = (offset + T) * invTminSTimesLengthPerRow;
+
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col-1);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I);
+ p.pixelPosterior(iVolumeIndex);
+ }
+
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, I);
+ p.pixelPosterior(iVolumeIndex);
+ }
+ }
+
+ // right
+ else if (S < offset) {
+ I = (offset - S) * invTminSTimesLengthPerRow;
+
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I);
+ p.pixelPosterior(iVolumeIndex);
+ }
+
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col+1);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, I);
+ p.pixelPosterior(iVolumeIndex);
+ }
+ }
+
+ // centre
+ else {
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow);
+ p.pixelPosterior(iVolumeIndex);
+ }
+ }
+
+ }
+ }
+
+ // horizontally
+ else {
+
+ // calculate y for col 0
+ float32 y = detY + (proj->fRayY/proj->fRayX)*(m_pVolumeGeometry->pixelColToCenterX(0)-detX);
+ float32 r = (m_pVolumeGeometry->getWindowMaxY() - y) * inv_pixelLengthY - 0.5f;
+ float32 update_r = -m_pVolumeGeometry->getPixelLengthX() * (proj->fRayY/proj->fRayX) * inv_pixelLengthY;
+
+ // for each col
+ for (col = 0; col < m_pVolumeGeometry->getGridColCount(); ++col, r += update_r) {
+
+ int row = int(r+0.5f);
+ float32 offset = r - float32(row);
+
+ if (row <= 0 || row >= m_pVolumeGeometry->getGridRowCount()-1) continue;
+
+ // up
+ if (offset < -S) {
+ I = (offset + T) * invTminSTimesLengthPerCol;
+
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row-1, col);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I);
+ p.pixelPosterior(iVolumeIndex);
+ }
+
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, I);
+ p.pixelPosterior(iVolumeIndex);
+ }
+ }
+
+ // down
+ else if (S < offset) {
+ I = (offset - S) * invTminSTimesLengthPerCol;
+
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I);
+ p.pixelPosterior(iVolumeIndex);
+ }
+
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row+1, col);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, I);
+ p.pixelPosterior(iVolumeIndex);
+ }
+ }
+
+ // centre
+ else {
+ iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col);
+ // POLICY: PIXEL PRIOR + ADD + POSTERIOR
+ if (p.pixelPrior(iVolumeIndex)) {
+ p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol);
+ p.pixelPosterior(iVolumeIndex);
+ }
+ }
+
+ }
+ } // end loop col
+
+ // POLICY: RAY POSTERIOR
+ p.rayPosterior(iRayIndex);
+
+ } // end loop detector
+ } // end loop angles
+
+} \ No newline at end of file
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 10:06:55 +0000