X-Git-Url: http://git.kpe.io/?p=ctsim.git;a=blobdiff_plain;f=libctsim%2Fbackprojectors.cpp;h=7551ff9a1d1e99a1e65336b4e726af20c9f26a12;hp=fc3c95882dd768458613be752749c10e759978a9;hb=4f15a69a3150f180bd93fcbe1c87dbaca92a77ad;hpb=7df269f65639c1a862a58649c48331824029128a diff --git a/libctsim/backprojectors.cpp b/libctsim/backprojectors.cpp index fc3c958..7551ff9 100644 --- a/libctsim/backprojectors.cpp +++ b/libctsim/backprojectors.cpp @@ -8,7 +8,7 @@ ** This is part of the CTSim program ** Copyright (c) 1983-2001 Kevin Rosenberg ** -** $Id: backprojectors.cpp,v 1.28 2001/02/23 02:06:01 kevin Exp $ +** $Id: backprojectors.cpp,v 1.33 2003/03/23 18:37:42 kevin Exp $ ** ** This program is free software; you can redistribute it and/or modify ** it under the terms of the GNU General Public License (version 2) as @@ -25,6 +25,7 @@ ******************************************************************************/ #include "ct.h" +#include "interpolator.h" const int Backprojector::BPROJ_INVALID = -1; const int Backprojector::BPROJ_TRIG = 0; @@ -98,12 +99,13 @@ const int Backprojector::s_iInterpCount = sizeof(s_aszInterpName) / sizeof(const -Backprojector::Backprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName, const int interpFactor) +Backprojector::Backprojector (const Projections& proj, ImageFile& im, const char* const backprojName, + const char* const interpName, const int interpFactor, const ReconstructionROI* pROI) { m_fail = false; m_pBackprojectImplem = NULL; - initBackprojector (proj, im, backprojName, interpName, interpFactor); + initBackprojector (proj, im, backprojName, interpName, interpFactor, pROI); } void @@ -133,7 +135,8 @@ Backprojector::~Backprojector () // and initializes the backprojector bool -Backprojector::initBackprojector (const Projections& proj, ImageFile& im, const char* const backprojName, const char* const interpName, const int interpFactor) +Backprojector::initBackprojector (const Projections& proj, ImageFile& im, const char* const backprojName, + const char* const interpName, const int interpFactor, const ReconstructionROI* pROI) { m_nameBackproject = backprojName; m_nameInterpolation = interpName; @@ -157,18 +160,18 @@ Backprojector::initBackprojector (const Projections& proj, ImageFile& im, const } if (proj.geometry() == Scanner::GEOMETRY_EQUILINEAR) - m_pBackprojectImplem = static_cast(new BackprojectEquilinear(proj, im, m_idInterpolation, interpFactor)); + m_pBackprojectImplem = static_cast(new BackprojectEquilinear(proj, im, m_idInterpolation, interpFactor, pROI)); else if (proj.geometry() == Scanner::GEOMETRY_EQUIANGULAR) - m_pBackprojectImplem = static_cast(new BackprojectEquiangular(proj, im, m_idInterpolation, interpFactor)); + m_pBackprojectImplem = static_cast(new BackprojectEquiangular(proj, im, m_idInterpolation, interpFactor, pROI)); else if (proj.geometry() == Scanner::GEOMETRY_PARALLEL) { if (m_idBackproject == BPROJ_TRIG) - m_pBackprojectImplem = static_cast(new BackprojectTrig (proj, im, m_idInterpolation, interpFactor)); + m_pBackprojectImplem = static_cast(new BackprojectTrig (proj, im, m_idInterpolation, interpFactor, pROI)); else if (m_idBackproject == BPROJ_TABLE) - m_pBackprojectImplem = static_cast(new BackprojectTable (proj, im, m_idInterpolation, interpFactor)); + m_pBackprojectImplem = static_cast(new BackprojectTable (proj, im, m_idInterpolation, interpFactor, pROI)); else if (m_idBackproject == BPROJ_DIFF) - m_pBackprojectImplem = static_cast(new BackprojectDiff (proj, im, m_idInterpolation, interpFactor)); + m_pBackprojectImplem = static_cast(new BackprojectDiff (proj, im, m_idInterpolation, interpFactor, pROI)); else if (m_idBackproject == BPROJ_IDIFF) - m_pBackprojectImplem = static_cast(new BackprojectIntDiff (proj, im, m_idInterpolation, interpFactor)); + m_pBackprojectImplem = static_cast(new BackprojectIntDiff (proj, im, m_idInterpolation, interpFactor, pROI)); } else { m_fail = true; m_failMessage = "Unable to select a backprojection method [Backprojector::initBackprojector]"; @@ -260,7 +263,8 @@ Backprojector::convertInterpIDToTitle (const int interpID) // PURPOSE // Pure virtual base class for all backprojectors. -Backproject::Backproject (const Projections& proj, ImageFile& im, int interpType, const int interpFactor) +Backproject::Backproject (const Projections& proj, ImageFile& im, int interpType, const int interpFactor, + const ReconstructionROI* pROI) : proj(proj), im(im), interpType(interpType), m_interpFactor(interpFactor), m_bPostProcessingDone(false) { detInc = proj.detInc(); @@ -285,10 +289,36 @@ Backproject::Backproject (const Projections& proj, ImageFile& im, int interpType yMin = -proj.phmLen() / 2; yMax = yMin + proj.phmLen(); + if (pROI) { + if (pROI->m_dXMin > xMin) + xMin = pROI->m_dXMin; + if (pROI->m_dXMax < xMax) + xMax = pROI->m_dXMax; + if (pROI->m_dYMin > yMin) + yMin = pROI->m_dYMin; + if (pROI->m_dYMax < yMax) + yMax = pROI->m_dYMax; + + if (xMin > xMax) { + double temp = xMin; + xMin = xMax; + xMax = temp; + } + if (yMin > yMax) { + double temp = yMin; + yMin = yMax; + yMax = temp; + } + } + xInc = (xMax - xMin) / nx; // size of cells yInc = (yMax - yMin) / ny; + im.setAxisIncrement (xInc, yInc); + im.setAxisExtent (xMin, xMax, yMin, yMax); + m_dFocalLength = proj.focalLength(); + m_dSourceDetectorLength = proj.sourceDetectorLength(); } Backproject::~Backproject () @@ -364,7 +394,7 @@ BackprojectTrig::BackprojectView (const double* const filteredProj, const double double frac = p - pFloor; // fraction distance from det if (iDetPos >= 0 && iDetPos < nDet - 1) v[ix][iy] += rotScale * ((1-frac) * filteredProj[iDetPos] + frac * filteredProj[iDetPos+1]); - } else if (interpType = Backprojector::INTERP_CUBIC) { + } else if (interpType == Backprojector::INTERP_CUBIC) { double p = iDetCenter + (L / detInc); // position along detector if (p >= 0 && p < nDet) v[ix][iy] += rotScale * pCubicInterp->interpolate (p); @@ -383,8 +413,9 @@ BackprojectTrig::BackprojectView (const double* const filteredProj, const double // PURPOSE // Precalculates trigometric function value for each point in image for backprojection. -BackprojectTable::BackprojectTable (const Projections& proj, ImageFile& im, int interpType, const int interpFactor) -: Backproject (proj, im, interpType, interpFactor) +BackprojectTable::BackprojectTable (const Projections& proj, ImageFile& im, int interpType, + const int interpFactor, const ReconstructionROI* pROI) +: Backproject (proj, im, interpType, interpFactor, pROI) { arrayR.initSetSize (im.nx(), im.ny()); arrayPhi.initSetSize (im.nx(), im.ny()); @@ -440,7 +471,7 @@ BackprojectTable::BackprojectView (const double* const filteredProj, const doubl double frac = dPos - dPosFloor; // fraction distance from det if (iDetPos >= 0 && iDetPos < nDet - 1) pImCol[iy] += ((1-frac) * filteredProj[iDetPos] + frac * filteredProj[iDetPos+1]); - } else if (interpType = Backprojector::INTERP_CUBIC) { + } else if (interpType == Backprojector::INTERP_CUBIC) { double p = iDetCenter + (L / detInc); // position along detector if (p >= 0 && p < nDet) pImCol[iy] += pCubicInterp->interpolate (p); @@ -460,8 +491,9 @@ BackprojectTable::BackprojectView (const double* const filteredProj, const doubl // Backprojects by precalculating the change in L position for each x & y step in the image. // Iterates in x & y direction by adding difference in L position -BackprojectDiff::BackprojectDiff (const Projections& proj, ImageFile& im, int interpType, const int interpFactor) -: Backproject (proj, im, interpType, interpFactor) +BackprojectDiff::BackprojectDiff (const Projections& proj, ImageFile& im, int interpType, + const int interpFactor, const ReconstructionROI* pROI) +: Backproject (proj, im, interpType, interpFactor, pROI) { // calculate center of first pixel v[0][0] double x = xMin + xInc / 2; @@ -517,7 +549,7 @@ BackprojectDiff::BackprojectView (const double* const filteredProj, const double double frac = curDetPos - detPosFloor; // fraction distance from det if (iDetPos > 0 && iDetPos < nDet - 1) *pImCol++ += filteredProj[iDetPos] + (frac * (filteredProj[iDetPos+1] - filteredProj[iDetPos])); - } else if (interpType = Backprojector::INTERP_CUBIC) { + } else if (interpType == Backprojector::INTERP_CUBIC) { double p = iDetCenter + curDetPos; // position along detector if (p >= 0 && p < nDet) *pImCol++ += pCubicInterp->interpolate (p); @@ -588,7 +620,7 @@ BackprojectIntDiff::BackprojectView (const double* const filteredProj, const dou if (iDetPos >= 0 && iDetPos <= iLastDet) *pImCol++ += filteredProj[iDetPos] + (detRemainder * deltaFilteredProj[iDetPos]); } // end for iy - } else if (interpType = Backprojector::INTERP_CUBIC) { + } else if (interpType == Backprojector::INTERP_CUBIC) { for (int iy = 0; iy < ny; iy++, curDetPos += det_dy) { *pImCol++ += pCubicInterp->interpolate (static_cast(curDetPos) / 65536); } @@ -664,10 +696,8 @@ BackprojectEquilinear::BackprojectView (const double* const filteredProj, const double dU = (m_dFocalLength + rsin_t) / m_dFocalLength; double dDetPos = rcos_t / dU; - // double to scale for imaginary detector that passes through origin - // of phantom, see Kak-Slaney Figure 3.22. This assumes that the detector is also - // located focal-length away from the origin. - dDetPos *= 2; + // Scale for imaginary detector that passes through origin of phantom, see Kak-Slaney Figure 3.22. + dDetPos *= m_dSourceDetectorLength / m_dFocalLength; double dPos = dDetPos / detInc; // position along detector array if (interpType == Backprojector::INTERP_NEAREST) {