updated 'linear' kernal projector

1 files changed, 134 insertions, 5 deletions

diff --git a/include/astra/ParallelBeamLinearKernelProjector2D.inl b/include/astra/ParallelBeamLinearKernelProjector2D.inl
index 67e0d58..04577de 100644
--- a/include/astra/ParallelBeamLinearKernelProjector2D.inl
+++ b/include/astra/ParallelBeamLinearKernelProjector2D.inl
@@ -30,22 +30,37 @@ $Id$
 template <typename Policy>
 void CParallelBeamLinearKernelProjector2D::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>
 void CParallelBeamLinearKernelProjector2D::projectSingleProjection(int _iProjection, Policy& p)
 {
-	projectBlock_internal(_iProjection, _iProjection + 1,
-	                      0, m_pProjectionGeometry->getDetectorCount(), p);
+	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
+		projectBlock_internal(_iProjection, _iProjection + 1,
+	                          0, m_pProjectionGeometry->getDetectorCount(), p);
+	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
+		projectBlock_internal_vector(_iProjection, _iProjection + 1,
+	                                 0, m_pProjectionGeometry->getDetectorCount(), p);
+	}
 }
 
 template <typename Policy>
 void CParallelBeamLinearKernelProjector2D::projectSingleRay(int _iProjection, int _iDetector, Policy& p)
 {
-	projectBlock_internal(_iProjection, _iProjection + 1,
+	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
+		projectBlock_internal(_iProjection, _iProjection + 1,
 	                      _iDetector, _iDetector + 1, p);
+	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
+		projectBlock_internal_vector(_iProjection, _iProjection + 1,
+	                      _iDetector, _iDetector + 1, p);
+	}
 }
 
 //----------------------------------------------------------------------------------------
@@ -182,3 +197,117 @@ void CParallelBeamLinearKernelProjector2D::projectBlock_internal(int _iProjFrom,
 
 }
 
+//----------------------------------------------------------------------------------------
+// PROJECT BLOCK - vector projection geometry
+template <typename Policy>
+void CParallelBeamLinearKernelProjector2D::projectBlock_internal_vector(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
+{
+	// variables
+	float32 detX, detY, x, y, c, r, update_c, update_r, offset;
+	float32 lengthPerRow, lengthPerCol, inv_pixelLengthX, inv_pixelLengthY;
+	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();
+
+	int colCount = m_pVolumeGeometry->getGridColCount();
+	int rowCount = m_pVolumeGeometry->getGridRowCount();
+
+	// loop angles
+	for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
+
+		proj = &pVecProjectionGeometry->getProjectionVectors()[iAngle];
+
+		bool vertical = fabs(proj->fRayX) < fabs(proj->fRayY);
+		if (vertical) {
+			lengthPerRow = m_pVolumeGeometry->getPixelLengthX() * sqrt(proj->fRayY*proj->fRayY + proj->fRayX*proj->fRayX) / abs(proj->fRayY);
+			update_c = -m_pVolumeGeometry->getPixelLengthY() * (proj->fRayX/proj->fRayY) * inv_pixelLengthX;
+		} else {
+			lengthPerCol = m_pVolumeGeometry->getPixelLengthY() * sqrt(proj->fRayY*proj->fRayY + proj->fRayX*proj->fRayX) / abs(proj->fRayX);
+			update_r = -m_pVolumeGeometry->getPixelLengthX() * (proj->fRayY/proj->fRayX) * inv_pixelLengthY;
+		}
+
+		// 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
+				x = detX + (proj->fRayX/proj->fRayY)*(m_pVolumeGeometry->pixelRowToCenterY(0)-detY);
+				c = (x - m_pVolumeGeometry->getWindowMinX()) * inv_pixelLengthX - 0.5f;
+
+				// for each row
+				for (row = 0; row < rowCount; ++row, c += update_c) {
+
+					col = int(c);
+					offset = c - float32(col);
+
+					if (col <= 0 || col >= colCount-1) continue;
+
+					iVolumeIndex = row * colCount + col;
+					// POLICY: PIXEL PRIOR + ADD + POSTERIOR
+					if (p.pixelPrior(iVolumeIndex)) {
+						p.addWeight(iRayIndex, iVolumeIndex, (1.0f - offset) * lengthPerRow);
+						p.pixelPosterior(iVolumeIndex);
+					}
+					
+					iVolumeIndex++;
+					// POLICY: PIXEL PRIOR + ADD + POSTERIOR
+					if (p.pixelPrior(iVolumeIndex)) {
+						p.addWeight(iRayIndex, iVolumeIndex, offset * lengthPerRow);
+						p.pixelPosterior(iVolumeIndex);
+					}
+
+				}
+			}
+
+			// horizontally
+			else {
+
+				// calculate y for col 0
+				y = detY + (proj->fRayY/proj->fRayX)*(m_pVolumeGeometry->pixelColToCenterX(0)-detX);
+				r = (m_pVolumeGeometry->getWindowMaxY() - y) * inv_pixelLengthY - 0.5f;
+
+				// for each col
+				for (col = 0; col < colCount; ++col, r += update_r) {
+
+					int row = int(r);
+					offset = r - float32(row);
+
+					if (row <= 0 || row >= rowCount-1) continue;
+
+					iVolumeIndex = row * colCount + col;
+					// POLICY: PIXEL PRIOR + ADD + POSTERIOR
+					if (p.pixelPrior(iVolumeIndex)) {
+						p.addWeight(iRayIndex, iVolumeIndex, (1.0f - offset) * lengthPerCol);
+						p.pixelPosterior(iVolumeIndex);
+					}
+
+					iVolumeIndex += colCount;
+					// POLICY: PIXEL PRIOR + ADD + POSTERIOR
+					if (p.pixelPrior(iVolumeIndex)) {
+						p.addWeight(iRayIndex, iVolumeIndex, offset * lengthPerCol);
+						p.pixelPosterior(iVolumeIndex);
+					}
+
+				}
+			}
+	
+			// POLICY: RAY POSTERIOR
+			p.rayPosterior(iRayIndex);
+	
+		} // end loop detector
+	} // end loop angles
+}
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