X-Git-Url: http://git.kpe.io/?p=ctsim.git;a=blobdiff_plain;f=libctsim%2Fbackprojectors.cpp;h=164b42eb78dca58d20ec61aebb3919c23cfce7c0;hp=bfd594e8697ef0075b98ce6bce5b325261b4b082;hb=87f312d59cabca5080b481a20314601ea476c4be;hpb=b7cbad1230585741079fad4881a8d67be2592100 diff --git a/libctsim/backprojectors.cpp b/libctsim/backprojectors.cpp index bfd594e..164b42e 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 1.30 2001/03/07 19:02:44 kevin Exp $ +** $Id: backprojectors.cpp,v 1.34 2003/07/04 21:39:40 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; @@ -34,18 +35,18 @@ const int Backprojector::BPROJ_IDIFF = 3; const char* const Backprojector::s_aszBackprojectName[] = { - {"trig"}, - {"table"}, - {"diff"}, - {"idiff"}, + "trig", + "table", + "diff", + "idiff", }; const char* const Backprojector::s_aszBackprojectTitle[] = { - {"Direct Trigometric"}, - {"Trigometric Table"}, - {"Difference Iteration"}, - {"Integer Difference Iteration"}, + "Direct Trigometric", + "Trigometric Table", + "Difference Iteration", + "Integer Difference Iteration", }; const int Backprojector::s_iBackprojectCount = sizeof(s_aszBackprojectName) / sizeof(const char*); @@ -64,33 +65,33 @@ const int Backprojector::INTERP_3BSPLINE = 7; const char* const Backprojector::s_aszInterpName[] = { - {"nearest"}, - {"linear"}, - {"cubic"}, + "nearest", + "linear", + "cubic", #if HAVE_FREQ_PREINTERP - {"freq_preinterpolationj"}, + "freq_preinterpolationj", #endif #if HAVE_BSPLINE_INTERP - {"bspline"}, - {"1bspline"}, - {"2bspline"}, - {"3bspline"}, + "bspline", + "1bspline", + "2bspline", + "3bspline", #endif }; const char* const Backprojector::s_aszInterpTitle[] = { - {"Nearest"}, - {"Linear"}, - {"Cubic"}, + "Nearest", + "Linear", + "Cubic", #if HAVE_FREQ_PREINTERP - {"Frequency Preinterpolation"}, + "Frequency Preinterpolation", #endif #if HAVE_BSPLINE_INTERP - {"B-Spline"}, - {"B-Spline 1st Order"}, - {"B-Spline 2nd Order"}, - {"B-Spline 3rd Order"}, + "B-Spline", + "B-Spline 1st Order", + "B-Spline 2nd Order", + "B-Spline 3rd Order", #endif }; @@ -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(); @@ -285,9 +289,34 @@ 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(); } @@ -384,8 +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()); @@ -461,8 +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;