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-rw-r--r--include/astra/ParallelBeamDistanceDrivenProjector2D.inl87
1 files changed, 41 insertions, 46 deletions
diff --git a/include/astra/ParallelBeamDistanceDrivenProjector2D.inl b/include/astra/ParallelBeamDistanceDrivenProjector2D.inl
index 7b45ed1..aedcee9 100644
--- a/include/astra/ParallelBeamDistanceDrivenProjector2D.inl
+++ b/include/astra/ParallelBeamDistanceDrivenProjector2D.inl
@@ -97,13 +97,12 @@ void CParallelBeamDistanceDrivenProjector2D::projectBlock_internal(int _iProjFro
const float32 Dx = proj->fDetSX + (iDetector+0.5f) * proj->fDetUX;
const float32 Dy = proj->fDetSY + (iDetector+0.5f) * proj->fDetUY;
- if (vertical && true) {
+ if (vertical) {
const float32 RxOverRy = proj->fRayX/proj->fRayY;
- // TODO: Determine det/pixel scaling factors
const float32 lengthPerRow = m_pVolumeGeometry->getPixelLengthX() * m_pVolumeGeometry->getPixelLengthY();
const float32 deltac = -pixelLengthY * RxOverRy * inv_pixelLengthX;
- const float32 deltad = fabs((proj->fDetUX - proj->fDetUY * RxOverRy) * inv_pixelLengthX);
+ const float32 deltad = 0.5f * fabs((proj->fDetUX - proj->fDetUY * RxOverRy) * inv_pixelLengthX);
// calculate c for row 0
float32 c = (Dx + (Ey - Dy)*RxOverRy - Ex) * inv_pixelLengthX + 0.5f;
@@ -112,57 +111,55 @@ void CParallelBeamDistanceDrivenProjector2D::projectBlock_internal(int _iProjFro
for (int row = 0; row < rowCount; ++row, c+= deltac) {
// horizontal extent of ray in center of this row:
- // [ c - deltad/2 , c + deltad/2 ]
+ // [ c - deltad , c + deltad ]
// |-gapBegin-*---|------|----*-gapEnd-|
- // * = ray extent intercepts; c - deltad/2 and c + deltad/2
+ // * = ray extent intercepts; c - deltad and c + deltad
// | = pixel column edges
- const int colBegin = (int)floor(c - deltad/2.0f);
- const int colEnd = (int)ceil(c + deltad/2.0f);
+ const int colBegin = (int)floor(c - deltad);
+ const int colEnd = (int)ceil(c + deltad);
- // TODO: Optimize volume edge checks
+ if (colBegin >= colCount || colEnd <= 0)
+ continue;
int iVolumeIndex = row * colCount + colBegin;
if (colBegin + 1 == colEnd) {
if (colBegin >= 0 && colBegin < colCount)
policy_weight(p, iRayIndex, iVolumeIndex,
- deltad * lengthPerRow);
+ 2.0f * deltad * lengthPerRow);
} else {
- const float gapBegin = (c - deltad/2.0f) - (float32)colBegin;
- const float gapEnd = (float32)colEnd - (c + deltad/2.0f);
- float tot = 1.0f - gapBegin;
- if (colBegin >= 0 && colBegin < colCount) {
+
+ if (colBegin >= 0) {
+ const float gapBegin = (c - deltad) - (float32)colBegin;
policy_weight(p, iRayIndex, iVolumeIndex,
(1.0f - gapBegin) * lengthPerRow);
}
- iVolumeIndex++;
- for (int col = colBegin + 1; col + 1 < colEnd; ++col, ++iVolumeIndex) {
- tot += 1.0f;
- if (col >= 0 && col < colCount) {
- policy_weight(p, iRayIndex, iVolumeIndex, lengthPerRow);
- }
+ const int clippedMColBegin = std::max(colBegin + 1, 0);
+ const int clippedMColEnd = std::min(colEnd - 1, colCount);
+ iVolumeIndex = row * colCount + clippedMColBegin;
+ for (int col = clippedMColBegin; col < clippedMColEnd; ++col, ++iVolumeIndex) {
+ policy_weight(p, iRayIndex, iVolumeIndex, lengthPerRow);
}
- assert(iVolumeIndex == row * colCount + colEnd - 1);
- tot += 1.0f - gapEnd;
- if (colEnd > 0 && colEnd <= colCount) {
+
+ iVolumeIndex = row * colCount + colEnd - 1;
+ if (colEnd <= colCount) {
+ const float gapEnd = (float32)colEnd - (c + deltad);
policy_weight(p, iRayIndex, iVolumeIndex,
(1.0f - gapEnd) * lengthPerRow);
}
- assert(fabs(tot - deltad) < 0.0001);
}
}
- } else if (!vertical && true) {
+ } else {
const float32 RyOverRx = proj->fRayY/proj->fRayX;
- // TODO: Determine det/pixel scaling factors
const float32 lengthPerCol = m_pVolumeGeometry->getPixelLengthX() * m_pVolumeGeometry->getPixelLengthY();
const float32 deltar = -pixelLengthX * RyOverRx * inv_pixelLengthY;
- const float32 deltad = fabs((proj->fDetUY - proj->fDetUX * RyOverRx) * inv_pixelLengthY);
+ const float32 deltad = 0.5f * fabs((proj->fDetUY - proj->fDetUX * RyOverRx) * inv_pixelLengthY);
// calculate r for col 0
float32 r = -(Dy + (Ex - Dx)*RyOverRx - Ey) * inv_pixelLengthY + 0.5f;
@@ -171,43 +168,41 @@ void CParallelBeamDistanceDrivenProjector2D::projectBlock_internal(int _iProjFro
for (int col = 0; col < colCount; ++col, r+= deltar) {
// vertical extent of ray in center of this column:
- // [ r - deltad/2 , r + deltad/2 ]
+ // [ r - deltad , r + deltad ]
- const int rowBegin = (int)floor(r - deltad/2.0f);
- const int rowEnd = (int)ceil(r + deltad/2.0f);
+ const int rowBegin = (int)floor(r - deltad);
+ const int rowEnd = (int)ceil(r + deltad);
- // TODO: Optimize volume edge checks
+ if (rowBegin >= rowCount || rowEnd <= 0)
+ continue;
int iVolumeIndex = rowBegin * colCount + col;
if (rowBegin + 1 == rowEnd) {
if (rowBegin >= 0 && rowBegin < rowCount)
policy_weight(p, iRayIndex, iVolumeIndex,
- deltad * lengthPerCol);
+ 2.0f * deltad * lengthPerCol);
} else {
- const float gapBegin = (r - deltad/2.0f) - (float32)rowBegin;
- const float gapEnd = (float32)rowEnd - (r + deltad/2.0f);
- float tot = 1.0f - gapBegin;
-
- if (rowBegin >= 0 && rowBegin < rowCount) {
+ if (rowBegin >= 0) {
+ const float gapBegin = (r - deltad) - (float32)rowBegin;
policy_weight(p, iRayIndex, iVolumeIndex,
(1.0f - gapBegin) * lengthPerCol);
}
- iVolumeIndex += colCount;
- for (int row = rowBegin + 1; row + 1 < rowEnd; ++row, iVolumeIndex += colCount) {
- tot += 1.0f;
- if (row >= 0 && row < rowCount) {
- policy_weight(p, iRayIndex, iVolumeIndex, lengthPerCol);
- }
+ const int clippedMRowBegin = std::max(rowBegin + 1, 0);
+ const int clippedMRowEnd = std::min(rowEnd - 1, rowCount);
+ iVolumeIndex = clippedMRowBegin * colCount + col;
+
+ for (int row = clippedMRowBegin; row < clippedMRowEnd; ++row, iVolumeIndex += colCount) {
+ policy_weight(p, iRayIndex, iVolumeIndex, lengthPerCol);
}
- assert(iVolumeIndex == (rowEnd - 1) * colCount + col);
- tot += 1.0f - gapEnd;
- if (rowEnd > 0 && rowEnd <= rowCount) {
+
+ iVolumeIndex = (rowEnd - 1) * colCount + col;
+ if (rowEnd <= rowCount) {
+ const float gapEnd = (float32)rowEnd - (r + deltad);
policy_weight(p, iRayIndex, iVolumeIndex,
(1.0f - gapEnd) * lengthPerCol);
}
- assert(fabs(tot - deltad) < 0.0001);
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 06:59:49 +0000