From c0b6862d75edcde6beacf811ce97200776d13b62 Mon Sep 17 00:00:00 2001 From: Wim van Aarle Date: Thu, 12 Mar 2015 15:16:10 +0100 Subject: updated 'line_fanflat' projector --- include/astra/FanFlatBeamLineKernelProjector2D.inl | 315 +++++++++------------ 1 file changed, 135 insertions(+), 180 deletions(-) (limited to 'include/astra/FanFlatBeamLineKernelProjector2D.inl') diff --git a/include/astra/FanFlatBeamLineKernelProjector2D.inl b/include/astra/FanFlatBeamLineKernelProjector2D.inl index 2f87659..1676cb1 100644 --- a/include/astra/FanFlatBeamLineKernelProjector2D.inl +++ b/include/astra/FanFlatBeamLineKernelProjector2D.inl @@ -51,246 +51,201 @@ void CFanFlatBeamLineKernelProjector2D::projectSingleRay(int _iProjection, int _ } //---------------------------------------------------------------------------------------- -// PROJECT BLOCK +// PROJECT BLOCK - vector projection geometry template void CFanFlatBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p) { // variables - float32 sin_theta, cos_theta, inv_sin_theta, inv_cos_theta, S, T, t, I, P, x, x2; - float32 lengthPerRow, updatePerRow, inv_pixelLengthX, lengthPerCol, updatePerCol, inv_pixelLengthY; - int iVolumeIndex, iRayIndex, row, col, iAngle, iDetector, x1; - bool switch_t; - - const CFanFlatProjectionGeometry2D* pProjectionGeometry = dynamic_cast(m_pProjectionGeometry); - const CFanFlatVecProjectionGeometry2D* pVecProjectionGeometry = dynamic_cast(m_pProjectionGeometry); - - float32 old_theta, theta, alpha; + 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(m_pProjectionGeometry)) { + pVecProjectionGeometry = dynamic_cast(m_pProjectionGeometry)->toVectorGeometry(); + } else { + pVecProjectionGeometry = dynamic_cast(m_pProjectionGeometry); + } + + // 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(); + // loop angles for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) { - // get theta - if (pProjectionGeometry) { - old_theta = pProjectionGeometry->getProjectionAngle(iAngle); - } - else if (pVecProjectionGeometry) { - proj = &pVecProjectionGeometry->getProjectionVectors()[iAngle]; - old_theta = atan2(-proj->fSrcX, proj->fSrcY); - if (old_theta < 0) old_theta += 2*PI; - } else { - assert(false); - } - - switch_t = false; - if (old_theta >= 7*PIdiv4) old_theta -= 2*PI; - if (old_theta >= 3*PIdiv4) { - old_theta -= PI; - switch_t = true; - } + proj = &pVecProjectionGeometry->getProjectionVectors()[iAngle]; // loop detectors for (iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) { - iRayIndex = iAngle * m_pProjectionGeometry->getDetectorCount() + iDetector; + iRayIndex = iAngle * detCount + iDetector; // POLICY: RAY PRIOR if (!p.rayPrior(iRayIndex)) continue; - - // get values - if (pProjectionGeometry) { - t = -pProjectionGeometry->indexToDetectorOffset(iDetector); - alpha = atan(t / pProjectionGeometry->getSourceDetectorDistance()); - t = sin(alpha) * pProjectionGeometry->getOriginSourceDistance(); - } - else if (pVecProjectionGeometry) { - float32 detX = proj->fDetSX + proj->fDetUX*(0.5f + iDetector); - float32 detY = proj->fDetSY + proj->fDetUY*(0.5f + iDetector); - alpha = angleBetweenVectors(-proj->fSrcX, -proj->fSrcY, detX - proj->fSrcX, detY - proj->fSrcY); - t = sin(alpha) * sqrt(proj->fSrcX*proj->fSrcX + proj->fSrcY*proj->fSrcY); + + detX = proj->fDetSX + (iDetector+0.5f) * proj->fDetUX; + detY = proj->fDetSY + (iDetector+0.5f) * proj->fDetUY; + + float32 fRayX = proj->fSrcX - detX; + float32 fRayY = proj->fSrcY - detY; + + bool vertical = fabs(fRayX) < fabs(fRayY); + 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); + invTminSTimesLengthPerRow = lengthPerRow / (T - S); } else { - assert(false); + 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); + invTminSTimesLengthPerCol = lengthPerCol / (T - S); } - if (switch_t) t = -t; - theta = old_theta + alpha; - - // precalculate sin, cos, 1/cos - sin_theta = sin(theta); - cos_theta = cos(theta); - inv_sin_theta = 1.0f / sin_theta; - inv_cos_theta = 1.0f / cos_theta; - - // precalculate kernel limits - lengthPerRow = m_pVolumeGeometry->getPixelLengthY() * inv_cos_theta; - updatePerRow = sin_theta * inv_cos_theta; - inv_pixelLengthX = 1.0f / m_pVolumeGeometry->getPixelLengthX(); - - // precalculate kernel limits - lengthPerCol = m_pVolumeGeometry->getPixelLengthX() * inv_sin_theta; - updatePerCol = cos_theta * inv_sin_theta; - inv_pixelLengthY = 1.0f / m_pVolumeGeometry->getPixelLengthY(); - - // precalculate S and T - S = 0.5f - 0.5f * ((updatePerRow < 0) ? -updatePerRow : updatePerRow); - T = 0.5f - 0.5f * ((updatePerCol < 0) ? -updatePerCol : updatePerCol); - // vertically - if (old_theta <= PIdiv4) { - + if (vertical) { + // calculate x for row 0 - P = (t - sin_theta * m_pVolumeGeometry->pixelRowToCenterY(0)) * inv_cos_theta; - x = (P - m_pVolumeGeometry->getWindowMinX()) * inv_pixelLengthX; + x = detX + (fRayX/fRayY)*(m_pVolumeGeometry->pixelRowToCenterY(0)-detY); + c = (x - m_pVolumeGeometry->getWindowMinX()) * inv_pixelLengthX - 0.5f; // for each row - for (row = 0; row < m_pVolumeGeometry->getGridRowCount(); ++row) { - - // get coords - x1 = int((x > 0.0f) ? x : x-1.0f); - x2 = x - x1; - x += updatePerRow; + for (row = 0; row < rowCount; ++row, c += update_c) { + + col = int(c+0.5f); + offset = c - float32(col); - if (x1 < -1 || x1 > m_pVolumeGeometry->getGridColCount()) continue; + if (col <= 0 || col >= colCount-1) continue; // left - if (x2 < 0.5f-S) { - I = (0.5f - S + x2) / (1.0f - 2.0f*S) * lengthPerRow; - - if (x1-1 >= 0 /*&& x1-1 < m_pVolumeGeometry->getGridColCount()*/) {//x1 is always less than or equal to gridColCount because of the "continue" in the beginning of the for-loop - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1-1); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I); - p.pixelPosterior(iVolumeIndex); - } + if (offset < -S) { + I = (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); } - if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) { - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, I); - p.pixelPosterior(iVolumeIndex); - } + iVolumeIndex++; + // POLICY: PIXEL PRIOR + ADD + POSTERIOR + if (p.pixelPrior(iVolumeIndex)) { + p.addWeight(iRayIndex, iVolumeIndex, I); + p.pixelPosterior(iVolumeIndex); } } - // center - else if (x2 <= 0.5f+S) { - if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) { - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow); - p.pixelPosterior(iVolumeIndex); - } - } - } - // right - else if (x2 <= 1.0f) { - I = (1.5f - S - x2) / (1.0f - 2.0f*S) * lengthPerRow; - - if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) { - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, I); - p.pixelPosterior(iVolumeIndex); - } + else if (S < offset) { + I = (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); + } + + iVolumeIndex++; + // POLICY: PIXEL PRIOR + ADD + POSTERIOR + if (p.pixelPrior(iVolumeIndex)) { + p.addWeight(iRayIndex, iVolumeIndex, I); + p.pixelPosterior(iVolumeIndex); } - if (/*x1+1 >= 0 &&*/ x1+1 < m_pVolumeGeometry->getGridColCount()) {//x1 is always greater than or equal to -1 because of the "continue" in the beginning of the for-loop - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1+1); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I); - p.pixelPosterior(iVolumeIndex); - } + } + + // centre + else { + iVolumeIndex = row * colCount + col; + // POLICY: PIXEL PRIOR + ADD + POSTERIOR + if (p.pixelPrior(iVolumeIndex)) { + p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow); + p.pixelPosterior(iVolumeIndex); } } + } } // horizontally - //else if (PIdiv4 <= old_theta && old_theta <= 3*PIdiv4) { else { - // calculate point P - P = (t - cos_theta * m_pVolumeGeometry->pixelColToCenterX(0)) * inv_sin_theta; - x = (m_pVolumeGeometry->getWindowMaxY() - P) * inv_pixelLengthY; + // calculate y for col 0 + y = detY + (fRayY/fRayX)*(m_pVolumeGeometry->pixelColToCenterX(0)-detX); + r = (m_pVolumeGeometry->getWindowMaxY() - y) * inv_pixelLengthY - 0.5f; // for each col - for (col = 0; col < m_pVolumeGeometry->getGridColCount(); ++col) { - - // get coords - x1 = int((x > 0.0f) ? x : x-1.0f); - x2 = x - x1; - x += updatePerCol; + for (col = 0; col < colCount; ++col, r += update_r) { + + int row = int(r+0.5f); + offset = r - float32(row); - if (x1 < -1 || x1 > m_pVolumeGeometry->getGridRowCount()) continue; + if (row <= 0 || row >= rowCount-1) continue; // up - if (x2 < 0.5f-T) { - I = (0.5f - T + x2) / (1.0f - 2.0f*T) * lengthPerCol; - - if (x1-1 >= 0 /*&& x1-1 < m_pVolumeGeometry->getGridRowCount()*/) {//x1 is always less than or equal to gridRowCount because of the "continue" in the beginning of the for-loop - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1-1, col); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I); - p.pixelPosterior(iVolumeIndex); - } + if (offset < -S) { + I = (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); } - if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridRowCount()) { - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, I); - p.pixelPosterior(iVolumeIndex); - } + iVolumeIndex += colCount; + // POLICY: PIXEL PRIOR + ADD + POSTERIOR + if (p.pixelPrior(iVolumeIndex)) { + p.addWeight(iRayIndex, iVolumeIndex, I); + p.pixelPosterior(iVolumeIndex); } } - // center - else if (x2 <= 0.5f+T) { - if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridRowCount()) { - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol); - p.pixelPosterior(iVolumeIndex); - } - } - } - // down - else if (x2 <= 1.0f) { - I = (1.5f - T - x2) / (1.0f - 2.0f*T) * lengthPerCol; - - if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridRowCount()) { - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, I); - p.pixelPosterior(iVolumeIndex); - } + else if (S < offset) { + I = (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); } - if (/*x1+1 >= 0 &&*/ x1+1 < m_pVolumeGeometry->getGridRowCount()) {//x1 is always greater than or equal to -1 because of the "continue" in the beginning of the for-loop - iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1+1, col); - // POLICY: PIXEL PRIOR + ADD + POSTERIOR - if (p.pixelPrior(iVolumeIndex)) { - p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I); - p.pixelPosterior(iVolumeIndex); - } + + iVolumeIndex += colCount; + // POLICY: PIXEL PRIOR + ADD + POSTERIOR + if (p.pixelPrior(iVolumeIndex)) { + p.addWeight(iRayIndex, iVolumeIndex, I); + p.pixelPosterior(iVolumeIndex); + } + } + + // centre + else { + iVolumeIndex = row * colCount + 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 + } -- cgit v1.2.3