/*****************************************************************************
** FILE IDENTIFICATION
**
-** Name: backprojectors.cpp Classes for backprojection
+** Name: backprojectors.cpp Classes for backprojection
** Programmer: Kevin Rosenberg
** Date Started: June 2000
**
** This is part of the CTSim program
-** Copyright (C) 1983-2000 Kevin Rosenberg
-**
-** $Id: backprojectors.cpp,v 1.18 2000/12/06 15:17:51 kevin Exp $
+** Copyright (c) 1983-2009 Kevin Rosenberg
**
** 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
******************************************************************************/
#include "ct.h"
+#include "interpolator.h"
const int Backprojector::BPROJ_INVALID = -1;
const int Backprojector::BPROJ_TRIG = 0;
const int Backprojector::BPROJ_TABLE = 1;
const int Backprojector::BPROJ_DIFF = 2;
-const int Backprojector::BPROJ_DIFF2 = 3;
-const int Backprojector::BPROJ_IDIFF2 = 4;
-const int Backprojector::BPROJ_IDIFF3 = 5;
-
-const char* Backprojector::s_aszBackprojectName[] =
-{
- {"trig"},
- {"table"},
- {"diff"},
- {"diff2"},
- {"idiff2"},
- {"idiff3"},
+const int Backprojector::BPROJ_IDIFF = 3;
+
+const char* const Backprojector::s_aszBackprojectName[] =
+{
+ "trig",
+ "table",
+ "diff",
+ "idiff",
};
-const char* Backprojector::s_aszBackprojectTitle[] =
+const char* const Backprojector::s_aszBackprojectTitle[] =
{
- {"Direct Trigometric"},
- {"Trigometric Table"},
- {"Difference Iteration"},
- {"Difference Iteration Optimized"},
- {"Integer Difference Iteration Optimized"},
- {"Integer Difference Iteration Highly-Optimized"},
+ "Direct Trigometric",
+ "Trigometric Table",
+ "Difference Iteration",
+ "Integer Difference Iteration",
};
const int Backprojector::s_iBackprojectCount = sizeof(s_aszBackprojectName) / sizeof(const char*);
const int Backprojector::INTERP_INVALID = -1;
const int Backprojector::INTERP_NEAREST = 0;
const int Backprojector::INTERP_LINEAR = 1;
-const int Backprojector::INTERP_FREQ_PREINTERPOLATION = 2;
+const int Backprojector::INTERP_CUBIC = 2;
+const int Backprojector::INTERP_FREQ_PREINTERPOLATION = 3;
#if HAVE_BSPLINE_INTERP
-const int Backprojector::INTERP_BSPLINE = 3;
-const int Backprojector::INTERP_1BSPLINE = 4;
-const int Backprojector::INTERP_2BSPLINE = 5;
-const int Backprojector::INTERP_3BSPLINE = 6;
+const int Backprojector::INTERP_BSPLINE = 4;
+const int Backprojector::INTERP_1BSPLINE = 5;
+const int Backprojector::INTERP_2BSPLINE = 6;
+const int Backprojector::INTERP_3BSPLINE = 7;
#endif
-const char* Backprojector::s_aszInterpName[] =
+const char* const Backprojector::s_aszInterpName[] =
{
- {"nearest"},
- {"linear"},
- {"freq_preinterpolationj"},
+ "nearest",
+ "linear",
+ "cubic",
+#if HAVE_FREQ_PREINTERP
+ "freq_preinterpolationj",
+#endif
#if HAVE_BSPLINE_INTERP
- {"bspline"},
- {"1bspline"},
- {"2bspline"},
- {"3bspline"},
+ "bspline",
+ "1bspline",
+ "2bspline",
+ "3bspline",
#endif
};
-const char* Backprojector::s_aszInterpTitle[] =
+const char* const Backprojector::s_aszInterpTitle[] =
{
- {"Nearest"},
- {"Linear"},
- {"Frequency Preinterpolationj"},
+ "Nearest",
+ "Linear",
+ "Cubic",
+#if HAVE_FREQ_PREINTERP
+ "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
};
-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
+void
Backprojector::BackprojectView (const double* const viewData, const double viewAngle)
{
if (m_pBackprojectImplem != NULL)
m_pBackprojectImplem->BackprojectView (viewData, viewAngle);
}
+void
+Backprojector::PostProcessing()
+{
+ if (m_pBackprojectImplem != NULL)
+ m_pBackprojectImplem->PostProcessing();
+}
+
Backprojector::~Backprojector ()
{
delete m_pBackprojectImplem;
// Backproject* projector = selectBackprojector (...)
//
// PURPOSE
-// Selects a backprojector based on BackprojType
+// Selects a backprojector based on BackprojType
// 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;
}
if (proj.geometry() == Scanner::GEOMETRY_EQUILINEAR)
- m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectEquilinear(proj, im, m_idInterpolation, interpFactor));
- else if (proj.geometry() == Scanner::GEOMETRY_EQUIANGULAR)
- m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectEquiangular(proj, im, m_idInterpolation, interpFactor));
+ m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectEquilinear(proj, im, m_idInterpolation, interpFactor, pROI));
+ else if (proj.geometry() == Scanner::GEOMETRY_EQUIANGULAR)
+ m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectEquiangular(proj, im, m_idInterpolation, interpFactor, pROI));
else if (proj.geometry() == Scanner::GEOMETRY_PARALLEL) {
- if (m_idBackproject == BPROJ_TRIG)
- m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectTrig (proj, im, m_idInterpolation, interpFactor));
- else if (m_idBackproject == BPROJ_TABLE)
- m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectTable (proj, im, m_idInterpolation, interpFactor));
- else if (m_idBackproject == BPROJ_DIFF)
- m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectDiff (proj, im, m_idInterpolation, interpFactor));
- else if (m_idBackproject == BPROJ_DIFF2)
- m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectDiff2 (proj, im, m_idInterpolation, interpFactor));
- else if (m_idBackproject == BPROJ_IDIFF2)
- m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectIntDiff2 (proj, im, m_idInterpolation, interpFactor));
- else if (m_idBackproject == BPROJ_IDIFF3)
- m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectIntDiff3 (proj, im, m_idInterpolation, interpFactor));
+ if (m_idBackproject == BPROJ_TRIG)
+ m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectTrig (proj, im, m_idInterpolation, interpFactor, pROI));
+ else if (m_idBackproject == BPROJ_TABLE)
+ m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectTable (proj, im, m_idInterpolation, interpFactor, pROI));
+ else if (m_idBackproject == BPROJ_DIFF)
+ m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectDiff (proj, im, m_idInterpolation, interpFactor, pROI));
+ else if (m_idBackproject == BPROJ_IDIFF)
+ m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectIntDiff (proj, im, m_idInterpolation, interpFactor, pROI));
} else {
- m_fail = true;
- m_failMessage = "Unable to select a backprojection method [Backprojector::initBackprojector]";
- return false;
+ m_fail = true;
+ m_failMessage = "Unable to select a backprojection method [Backprojector::initBackprojector]";
+ return false;
}
return true;
{
int backprojID = BPROJ_INVALID;
- for (int i = 0; i < s_iBackprojectCount; i++)
- if (strcasecmp (backprojName, s_aszBackprojectName[i]) == 0) {
- backprojID = i;
- break;
- }
-
+ for (int i = 0; i < s_iBackprojectCount; i++) {
+ if (strcasecmp (backprojName, s_aszBackprojectName[i]) == 0) {
+ backprojID = i;
+ break;
+ }
+ }
return (backprojID);
}
static const char *bprojName = "";
if (bprojID >= 0 && bprojID < s_iBackprojectCount)
- return (s_aszBackprojectName[bprojID]);
+ return (s_aszBackprojectName[bprojID]);
return (bprojName);
}
static const char *bprojTitle = "";
if (bprojID >= 0 && bprojID < s_iBackprojectCount)
- return (s_aszBackprojectTitle[bprojID]);
+ return (s_aszBackprojectTitle[bprojID]);
return (bprojTitle);
}
{
int interpID = INTERP_INVALID;
- for (int i = 0; i < s_iInterpCount; i++)
- if (strcasecmp (interpName, s_aszInterpName[i]) == 0) {
- interpID = i;
- break;
- }
-
+ for (int i = 0; i < s_iInterpCount; i++) {
+ if (strcasecmp (interpName, s_aszInterpName[i]) == 0) {
+ interpID = i;
+ break;
+ }
+ }
return (interpID);
}
static const char *interpName = "";
if (interpID >= 0 && interpID < s_iInterpCount)
- return (s_aszInterpName[interpID]);
+ return (s_aszInterpName[interpID]);
return (interpName);
}
static const char *interpTitle = "";
if (interpID >= 0 && interpID < s_iInterpCount)
- return (s_aszInterpTitle[interpID]);
+ return (s_aszInterpTitle[interpID]);
return (interpTitle);
}
// PURPOSE
// Pure virtual base class for all backprojectors.
-Backproject::Backproject (const Projections& proj, ImageFile& im, int interpType, const int interpFactor)
- : proj(proj), im(im), interpType(interpType), m_interpFactor(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();
nDet = proj.nDet();
- iDetCenter = (nDet - 1) / 2; // index refering to L=0 projection
- rotScale = proj.rotInc();
- rotScale /= (proj.nView() * proj.rotInc() / PI); // scale by number of PI rotations
+ iDetCenter = (nDet - 1) / 2; // index refering to L=0 projection
+
+ if (proj.geometry() == Scanner::GEOMETRY_PARALLEL)
+ rotScale = PI / proj.nView(); // scale by number of PI rotations
+ else if (proj.geometry() == Scanner::GEOMETRY_EQUIANGULAR || proj.geometry() == Scanner::GEOMETRY_EQUILINEAR)
+ rotScale = (2 * PI) / proj.nView(); // scale by number of 2PI rotations
+ else
+ sys_error (ERR_SEVERE, "Invalid geometry type %d [Backproject::Backproject]", proj.geometry());
v = im.getArray();
nx = im.nx();
yMin = -proj.phmLen() / 2;
yMax = yMin + proj.phmLen();
- xInc = (xMax - xMin) / nx; // size of cells
+ 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 ()
{}
+void
+Backproject::PostProcessing()
+{
+ m_bPostProcessingDone = true;
+}
+
void
Backproject::ScaleImageByRotIncrement ()
{
void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double r, double phi, double L, int iDetPos)
{
- sys_error (ERR_WARNING, "r=%f, phi=%f", r, phi);
- errorIndexOutsideDetector (ix, iy, theta, L, iDetPos);
+ sys_error (ERR_WARNING, "r=%f, phi=%f", r, phi);
+ errorIndexOutsideDetector (ix, iy, theta, L, iDetPos);
}
void Backproject::errorIndexOutsideDetector (int ix, int iy, double theta, double L, int iDetPos)
-{\r
+{
#if 1
- ostringstream os;
+ std::ostringstream os;
os << "ix=" << ix << ", iy=" << iy << ", theta=" << theta << ", L=" << L << ", detinc=" << detInc << "\n";
os << "ndet=" << nDet << ", detInc=" << detInc << ", iDetCenter=" << iDetCenter << "\n";
os << "xMin=" << xMin << ", xMax=" << xMax << ", xInc=" << xInc << "\n";
os << "yMin=" << yMin << ", yMax=" << yMax << ", yInc=" << yInc << "\n";
os << "iDetPos index outside bounds: " << iDetPos << " [backprojector]";;
- sys_error (ERR_WARNING, os.str().c_str());\r
+ sys_error (ERR_WARNING, os.str().c_str());
#endif
}
{
double theta = view_angle;
- double x = xMin + xInc / 2; // Rectang coords of center of pixel
- for (int ix = 0; ix < nx; x += xInc, ix++) {
+ CubicPolyInterpolator* pCubicInterp = NULL;
+ if (interpType == Backprojector::INTERP_CUBIC)
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
+
+ double xstart = xMin + xInc / 2; // Rectang coords of center of pixel
+#if HAVE_OPENMP
+ #pragma omp parallel for
+#endif
+ for (int ix = 0; ix < nx; ix++) {
+ double x = xstart + (ix * xInc);
+
double y = yMin + yInc / 2;
for (int iy = 0; iy < ny; y += yInc, iy++) {
double r = sqrt (x * x + y * y); // distance of cell from center
double L = r * cos (theta - phi); // position on detector
if (interpType == Backprojector::INTERP_NEAREST) {
- int iDetPos = iDetCenter + nearest<int> (L / detInc); // calc'd index in the filter raysum array
+ int iDetPos = iDetCenter + nearest<int> (L / detInc); // calc'd index in the filter raysum array
- if (iDetPos < 0 || iDetPos >= nDet) // check for impossible: index outside of raysum pos
- errorIndexOutsideDetector (ix, iy, theta, r, phi, L, iDetPos);
- else
- v[ix][iy] += rotScale * filteredProj[iDetPos];
+ if (iDetPos >= 0 && iDetPos < nDet)
+ v[ix][iy] += rotScale * filteredProj[iDetPos];
} else if (interpType == Backprojector::INTERP_LINEAR) {
- double p = L / detInc; // position along detector
- double pFloor = floor (p);
- int iDetPos = iDetCenter + static_cast<int>(pFloor);
- double frac = p - pFloor; // fraction distance from det
- if (iDetPos < 0 || iDetPos >= nDet - 1) // check for impossible: index outside of raysum pos
- errorIndexOutsideDetector (ix, iy, theta, r, phi, L, iDetPos);
- else
- v[ix][iy] += rotScale * ((1-frac) * filteredProj[iDetPos] + frac * filteredProj[iDetPos+1]);
+ double p = L / detInc; // position along detector
+ double pFloor = floor (p);
+ int iDetPos = iDetCenter + static_cast<int>(pFloor);
+ 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) {
+ double p = iDetCenter + (L / detInc); // position along detector
+ if (p >= 0 && p < nDet)
+ v[ix][iy] += rotScale * pCubicInterp->interpolate (p);
}
}
}
-}
+
+ if (interpType == Backprojector::INTERP_CUBIC)
+ delete pCubicInterp;
+}
// CLASS IDENTICATION
// 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());
r = arrayR.getArray();
phi = arrayPhi.getArray();
- double x, y; // Rectang coords of center of pixel
- int ix, iy;
- for (x = xMin + xInc / 2, ix = 0; ix < nx; x += xInc, ix++)
- for (y = yMin + yInc / 2, iy = 0; iy < ny; y += yInc, iy++) {
+ double xstart = xMin + xInc / 2;
+
+#if HAVE_OPENMP
+ #pragma omp parallel for
+#endif
+ for (int ix = 0; ix < nx; ix++) {
+ double x = xstart + (ix * xInc);
+ double y = yMin + yInc / 2;
+ for (int iy = 0; iy < ny; iy++, y += yInc) {
r[ix][iy] = sqrt (x * x + y * y);
phi[ix][iy] = atan2 (y, x);
}
+ }
}
BackprojectTable::~BackprojectTable ()
{
- ScaleImageByRotIncrement();
+}
+
+void
+BackprojectTable::PostProcessing()
+{
+ if (! m_bPostProcessingDone) {
+ ScaleImageByRotIncrement();
+ m_bPostProcessingDone = true;
+ }
}
void
{
double theta = view_angle;
+ CubicPolyInterpolator* pCubicInterp = NULL;
+ if (interpType == Backprojector::INTERP_CUBIC)
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
+
+#if HAVE_OPENMP
+ #pragma omp parallel for
+#endif
for (int ix = 0; ix < nx; ix++) {
ImageFileColumn pImCol = v[ix];
double L = r[ix][iy] * cos (theta - phi[ix][iy]);
if (interpType == Backprojector::INTERP_NEAREST) {
- int iDetPos = iDetCenter + nearest<int>(L / detInc); // calc index in the filtered raysum vector
+ int iDetPos = iDetCenter + nearest<int>(L / detInc); // calc index in the filtered raysum vector
- if (iDetPos < 0 || iDetPos >= nDet) // check for impossible: index outside of raysum pos
- errorIndexOutsideDetector (ix, iy, theta, r[ix][iy], phi[ix][iy], L, iDetPos);
- else
- pImCol[iy] += filteredProj[iDetPos];
+ if (iDetPos >= 0 && iDetPos < nDet) {
+ pImCol[iy] += filteredProj[iDetPos];
+ }
} else if (interpType == Backprojector::INTERP_LINEAR) {
- double dPos = L / detInc; // position along detector
- double dPosFloor = floor (dPos);
- int iDetPos = iDetCenter + static_cast<int>(dPosFloor);
- double frac = dPos - dPosFloor; // fraction distance from det
- if (iDetPos < 0 || iDetPos >= nDet - 1)
- errorIndexOutsideDetector (ix, iy, theta, r[ix][iy], phi[ix][iy], L, iDetPos);
- else
- pImCol[iy] += ((1-frac) * filteredProj[iDetPos] + frac * filteredProj[iDetPos+1]);
+ double dPos = L / detInc; // position along detector
+ double dPosFloor = floor (dPos);
+ int iDetPos = iDetCenter + static_cast<int>(dPosFloor);
+ 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) {
+ double p = iDetCenter + (L / detInc); // position along detector
+ if (p >= 0 && p < nDet) {
+ pImCol[iy] += pCubicInterp->interpolate (p);
+ }
}
- } // end for y
- } // end for x
+ } // end for y
+ } // end for x
+
+ if (interpType == Backprojector::INTERP_CUBIC)
+ delete pCubicInterp;
}
// 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]
+ // calculate center of first pixel v[0][0]
double x = xMin + xInc / 2;
double y = yMin + yInc / 2;
start_r = sqrt (x * x + y * y);
im.arrayDataClear();
}
-BackprojectDiff::~BackprojectDiff()
+BackprojectDiff::~BackprojectDiff ()
{
- ScaleImageByRotIncrement();
}
void
-BackprojectDiff::BackprojectView (const double* const filteredProj, const double view_angle)
+BackprojectDiff::PostProcessing()
{
- double theta = view_angle; // add half PI to view angle to get perpendicular theta angle
- double det_dx = xInc * cos (theta);
- double det_dy = yInc * sin (theta);
- double lColStart = start_r * cos (theta - start_phi); // calculate L for first point in image
-
- for (int ix = 0; ix < nx; ix++, lColStart += det_dx) {
- double curDetPos = lColStart;
- ImageFileColumn pImCol = v[ix];
-
- for (int iy = 0; iy < ny; iy++, curDetPos += det_dy) {
-#ifdef DEBUG
- printf ("[%2d,%2d]: %8.5f ", ix, iy, curDetPos);
-#endif
- if (interpType == Backprojector::INTERP_NEAREST) {
- int iDetPos = iDetCenter + nearest<int>(curDetPos / detInc); // calc index in the filtered raysum vector
-
- if (iDetPos < 0 || iDetPos >= nDet) // check for impossible: index outside of raysum pos
- errorIndexOutsideDetector (ix, iy, theta, curDetPos, iDetPos);
- else
- pImCol[iy] += filteredProj[iDetPos];
- } else if (interpType == Backprojector::INTERP_LINEAR) {
- double detPos = curDetPos / detInc; // position along detector
- double detPosFloor = floor (detPos);
- int iDetPos = iDetCenter + static_cast<int>(detPosFloor);
- double frac = detPos - detPosFloor; // fraction distance from det
- if (iDetPos < 0 || iDetPos >= nDet - 1)
- errorIndexOutsideDetector (ix, iy, theta, curDetPos, iDetPos);
- else
- pImCol[iy] += ((1-frac) * filteredProj[iDetPos] + frac * filteredProj[iDetPos+1]);
- }
- } // end for y
- } // end for x
+ if (! m_bPostProcessingDone) {
+ ScaleImageByRotIncrement();
+ m_bPostProcessingDone = true;
+ }
}
-
-// CLASS IDENTICATION
-// BackprojectDiff2
-//
-// PURPOSE
-// Optimized version of BackprojectDiff
-
void
-BackprojectDiff2::BackprojectView (const double* const filteredProj, const double view_angle)
+BackprojectDiff::BackprojectView (const double* const filteredProj, const double view_angle)
{
double theta = view_angle;
- // Distance betw. detectors for an angle given in units of detectors
+ // Distance between detectors for an angle given in units of detectors
double det_dx = xInc * cos (theta) / detInc;
double det_dy = yInc * sin (theta) / detInc;
- // calculate detPosition for first point in image (ix=0, iy=0)
- double detPosColStart = start_r * cos (theta - start_phi) / detInc;
-
-#ifdef DEBUG
- printf ("start_r=%8.5f, start_phi=%8.5f, rotScale=%8.5f\n", start_r, start_phi, rotScale);
-#endif
- for (int ix = 0; ix < nx; ix++, detPosColStart += det_dx) {
- double curDetPos = detPosColStart;
- ImageFileColumn pImCol = v[ix];
+ // calculate detPosition for first point in image (ix=0, iy=0)
+ double detPosColBase = iDetCenter + start_r * cos (theta - start_phi) / detInc;
- for (int iy = 0; iy < ny; iy++, curDetPos += det_dy) {
-#ifdef DEBUG
- printf ("[%2d,%2d]: %8.5f %8.5f\n", ix, iy, curDetPos, filteredProj[iDetCenter + nearest<int>(curDetPos)]);
-#endif
- if (interpType == Backprojector::INTERP_NEAREST) {
- int iDetPos = iDetCenter + nearest<int> (curDetPos); // calc index in the filtered raysum vector
-
- if (iDetPos < 0 || iDetPos >= nDet) // check for impossible: index outside of raysum pos
- errorIndexOutsideDetector (ix, iy, theta, curDetPos, iDetPos);
- else
- *pImCol++ += filteredProj[iDetPos];
- } else if (interpType == Backprojector::INTERP_LINEAR) {
- double detPosFloor = floor (curDetPos);
- int iDetPos = iDetCenter + static_cast<int>(detPosFloor);
- double frac = curDetPos - detPosFloor; // fraction distance from det
- if (iDetPos < 0 || iDetPos >= nDet - 1)
- errorIndexOutsideDetector (ix, iy, theta, curDetPos, iDetPos);
- else
- *pImCol++ += filteredProj[iDetPos] + (frac * (filteredProj[iDetPos+1] - filteredProj[iDetPos]));
- }
- } // end for y
- } // end for x
-}
-
-// CLASS IDENTICATION
-// BackprojectIntDiff2
-//
-// PURPOSE
-// Integer version of BackprojectDiff2
-
-void
-BackprojectIntDiff2::BackprojectView (const double* const filteredProj, const double view_angle)
-{
- double theta = view_angle;
-
- static const kint32 scale = 1 << 16;
- static const double dScale = scale;
- static const kint32 halfScale = scale / 2;
+ CubicPolyInterpolator* pCubicInterp = NULL;
+ double* deltaFilteredProj = NULL;
+ if (interpType == Backprojector::INTERP_LINEAR) {
+ // precalculate scaled difference for linear interpolation
+ deltaFilteredProj = new double [nDet];
+ for (int i = 0; i < nDet - 1; i++)
+ deltaFilteredProj[i] = filteredProj[i+1] - filteredProj[i];
+ deltaFilteredProj[nDet - 1] = 0; // last detector
+ } else if (interpType == Backprojector::INTERP_CUBIC) {
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
+ }
- const kint32 det_dx = nearest<kint32> (xInc * cos (theta) / detInc * scale);
- const kint32 det_dy = nearest<kint32> (yInc * sin (theta) / detInc * scale);
+ int iLastDet = nDet - 1;
- // calculate L for first point in image (0, 0)
- kint32 detPosColStart = nearest<kint32> (start_r * cos (theta - start_phi) / detInc * scale);
-
- for (int ix = 0; ix < nx; ix++, detPosColStart += det_dx) {
- kint32 curDetPos = detPosColStart;
+#if HAVE_OPENMP
+ #pragma omp parallel for
+#endif
+ for (int ix = 0; ix < nx; ix++) {
+ double detPos = detPosColBase + (ix * det_dx);
ImageFileColumn pImCol = v[ix];
- for (int iy = 0; iy < ny; iy++, curDetPos += det_dy) {
+ for (int iy = 0; iy < ny; iy++, detPos += det_dy) {
if (interpType == Backprojector::INTERP_NEAREST) {
- int detPosNearest = (curDetPos >= 0 ? ((curDetPos + halfScale) / scale) : ((curDetPos - halfScale) / scale));
- int iDetPos = iDetCenter + detPosNearest; // calc index in the filtered raysum vector
-
- if (iDetPos < 0 || iDetPos >= nDet) // check for index outside of raysum pos
- errorIndexOutsideDetector (ix, iy, theta, curDetPos, iDetPos);
- else
- *pImCol++ += filteredProj[iDetPos];
+ int iDetPos = nearest<int> (detPos); // calc index in the filtered raysum vector
+ if (iDetPos >= 0 && iDetPos < nDet) {
+ *pImCol++ += filteredProj[iDetPos];
+ }
} else if (interpType == Backprojector::INTERP_LINEAR) {
- kint32 detPosFloor = curDetPos / scale;
- kint32 detPosRemainder = curDetPos % scale;
- if (detPosRemainder < 0) {
- detPosFloor--;
- detPosRemainder += scale;
- }
- int iDetPos = iDetCenter + detPosFloor;
- double frac = detPosRemainder / dScale;
- if (iDetPos < 0 || iDetPos >= nDet - 1)
- errorIndexOutsideDetector (ix, iy, theta, curDetPos, iDetPos);
- else
- *pImCol++ += ((1.-frac) * filteredProj[iDetPos] + frac * filteredProj[iDetPos+1]);
+ double detPosFloor = floor (detPos);
+ int iDetPos = static_cast<int>(detPosFloor);
+ double frac = detPos - detPosFloor; // fraction distance from det
+ if (iDetPos >= 0 && iDetPos <= iLastDet) {
+ *pImCol++ += filteredProj[iDetPos] + (frac * deltaFilteredProj[iDetPos]);
+ }
+ } else if (interpType == Backprojector::INTERP_CUBIC) {
+ double p = detPos; // position along detector
+ if (p >= 0 && p < nDet) {
+ *pImCol++ += pCubicInterp->interpolate (p);
+ }
}
- } // end for y
- } // end for x
+ } // end for y
+ } // end for x
+
+ if (interpType == Backprojector::INTERP_LINEAR)
+ delete deltaFilteredProj;
+ else if (interpType == Backprojector::INTERP_CUBIC)
+ delete pCubicInterp;
}
+
// CLASS IDENTICATION
-// BackprojectIntDiff3
+// BackprojectIntDiff
//
// PURPOSE
-// Highly optimized version of BackprojectIntDiff2
+// Highly optimized and integer version of BackprojectDiff
void
-BackprojectIntDiff3::BackprojectView (const double* const filteredProj, const double view_angle)
+BackprojectIntDiff::BackprojectView (const double* const filteredProj, const double view_angle)
{
double theta = view_angle; // add half PI to view angle to get perpendicular theta angle
+#if SIZEOF_LONG == 4
static const int scaleShift = 16;
- static const kint32 scale = (1 << scaleShift);
- static const kint32 scaleBitmask = scale - 1;
- static const kint32 halfScale = scale / 2;
+#elif SIZEOF_LONG == 8
+ static const int scaleShift = 32;
+#endif
+ static const long scale = (1L << scaleShift);
+ static const long scaleBitmask = scale - 1;
+ static const long halfScale = scale / 2;
static const double dInvScale = 1. / scale;
- const kint32 det_dx = nearest<kint32> (xInc * cos (theta) / detInc * scale);
- const kint32 det_dy = nearest<kint32> (yInc * sin (theta) / detInc * scale);
+ const long det_dx = nearest<long> (xInc * cos (theta) / detInc * scale);
+ const long det_dy = nearest<long> (yInc * sin (theta) / detInc * scale);
+
+ // calculate L for first point in image (0, 0)
+ long detPosColBase = nearest<long> ((start_r * cos (theta - start_phi) / detInc + iDetCenter) * scale);
- // calculate L for first point in image (0, 0)
- kint32 detPosColStart = nearest<kint32> ((start_r * cos (theta - start_phi) / detInc + iDetCenter) * scale);
-
- // precalculate scaled difference for linear interpolation
- double* deltaFilteredProj = new double [nDet];
+ double* deltaFilteredProj = NULL;
+ CubicPolyInterpolator* pCubicInterp = NULL;
if (interpType == Backprojector::INTERP_LINEAR) {
+ // precalculate scaled difference for linear interpolation
+ deltaFilteredProj = new double [nDet];
for (int i = 0; i < nDet - 1; i++)
deltaFilteredProj[i] = (filteredProj[i+1] - filteredProj[i]) * dInvScale;
+ deltaFilteredProj[nDet - 1] = 0; // last detector
+ } else if (interpType == Backprojector::INTERP_CUBIC) {
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
}
- deltaFilteredProj[nDet - 1] = 0; // last detector
int iLastDet = nDet - 1;
- for (int ix = 0; ix < nx; ix++, detPosColStart += det_dx) {
- kint32 curDetPos = detPosColStart;
+#if HAVE_OPENMP
+ #pragma omp parallel for
+#endif
+ for (int ix = 0; ix < nx; ix++) {
+ long detPos = detPosColBase + (ix * det_dx);
ImageFileColumn pImCol = v[ix];
- if (interpType == Backprojector::INTERP_NEAREST) {
- for (int iy = 0; iy < ny; iy++, curDetPos += det_dy) {
- const int iDetPos = (curDetPos + halfScale) >> 16;
- if (iDetPos >= 0 && iDetPos <= iLastDet)
- *pImCol++ += filteredProj[iDetPos];
- } // end for iy
- } else if (interpType == Backprojector::INTERP_FREQ_PREINTERPOLATION) {
- for (int iy = 0; iy < ny; iy++, curDetPos += det_dy) {
- const int iDetPos = ((curDetPos + halfScale) >> 16) * m_interpFactor;
- if (iDetPos >= 0 && iDetPos <= iLastDet)
- *pImCol++ += filteredProj[iDetPos];
- } // end for iy
- } else if (interpType == Backprojector::INTERP_LINEAR) {
- for (int iy = 0; iy < ny; iy++, curDetPos += det_dy) {
- const kint32 iDetPos = curDetPos >> scaleShift;
- const kint32 detRemainder = curDetPos & scaleBitmask;
- if (iDetPos >= 0 && iDetPos <= iLastDet)
- *pImCol++ += filteredProj[iDetPos] + (detRemainder * deltaFilteredProj[iDetPos]);
- } // end for iy
- } //end linear
- } // end for ix\r
-\r
- delete deltaFilteredProj;
+ for (int iy = 0; iy < ny; iy++, detPos += det_dy) {
+ if (interpType == Backprojector::INTERP_NEAREST) {
+ const int iDetPos = (detPos + halfScale) >> scaleShift;
+ if (iDetPos >= 0 && iDetPos <= iLastDet) {
+ *pImCol++ += filteredProj[iDetPos];
+ } else
+ pImCol++;
+ } else if (interpType == Backprojector::INTERP_FREQ_PREINTERPOLATION) {
+ const int iDetPos = ((detPos + halfScale) >> scaleShift) * m_interpFactor;
+ if (iDetPos >= 0 && iDetPos <= iLastDet) {
+ *pImCol++ += filteredProj[iDetPos];
+ } else
+ pImCol++;
+ } else if (interpType == Backprojector::INTERP_LINEAR) {
+ const long iDetPos = detPos >> scaleShift;
+ if (iDetPos >= 0 && iDetPos <= iLastDet) {
+ const long detRemainder = detPos & scaleBitmask;
+ *pImCol++ += filteredProj[iDetPos] + (detRemainder * deltaFilteredProj[iDetPos]);
+ } else
+ pImCol++;
+ } else if (interpType == Backprojector::INTERP_CUBIC) {
+ *pImCol++ += pCubicInterp->interpolate (static_cast<double>(detPos) / scale);
+ } // end Cubic
+ } // end for iy
+ } // end for ix
+
+ if (interpType == Backprojector::INTERP_LINEAR)
+ delete deltaFilteredProj;
+ else if (interpType == Backprojector::INTERP_CUBIC)
+ delete pCubicInterp;
}
{
double beta = view_angle;
+ CubicPolyInterpolator* pCubicInterp = NULL;
+ if (interpType == Backprojector::INTERP_CUBIC)
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
+
+#if HAVE_OPENMP
+ #pragma omp parallel for
+#endif
for (int ix = 0; ix < nx; ix++) {
ImageFileColumn pImCol = v[ix];
- for (int iy = 0; iy < ny; iy++) {
+ for (int iy = 0; iy < ny; iy++) {
double dAngleDiff = beta - phi[ix][iy];
double rcos_t = r[ix][iy] * cos (dAngleDiff);
double rsin_t = r[ix][iy] * sin (dAngleDiff);
double dFLPlusSin = m_dFocalLength + rsin_t;
double gamma = atan (rcos_t / dFLPlusSin);
+ double dPos = gamma / detInc; // position along detector
double dL2 = dFLPlusSin * dFLPlusSin + (rcos_t * rcos_t);
if (interpType == Backprojector::INTERP_NEAREST) {
- int iDetPos =iDetCenter + nearest<int>(gamma / detInc); // calc index in the filtered raysum vector
-
- if (iDetPos < 0 || iDetPos >= nDet) { // check for impossible: index outside of raysum pos
- ; // errorIndexOutsideDetector (ix, iy, beta, r[ix][iy], phi[ix][iy], gamma, iDetPos);
- } else
- pImCol[iy] += filteredProj[iDetPos] / dL2;
+ int iDetPos = iDetCenter + nearest<int>(dPos); // calc index in the filtered raysum vector
+ if (iDetPos >= 0 && iDetPos < nDet)
+ pImCol[iy] += filteredProj[iDetPos] / dL2;
} else if (interpType == Backprojector::INTERP_LINEAR) {
- double dPos = gamma / detInc; // position along detector
- double dPosFloor = floor (dPos);
- int iDetPos = iDetCenter + static_cast<int>(dPosFloor);
- double frac = dPos - dPosFloor; // fraction distance from det
- if (iDetPos < 0 || iDetPos >= nDet - 1) {
- ; // errorIndexOutsideDetector (ix, iy, beta, r[ix][iy], phi[ix][iy], gamma, iDetPos);
- } else
- pImCol[iy] += (filteredProj[iDetPos] + frac * (filteredProj[iDetPos+1] - filteredProj[iDetPos])) / dL2;
+ double dPosFloor = floor (dPos);
+ int iDetPos = iDetCenter + static_cast<int>(dPosFloor);
+ double frac = dPos - dPosFloor; // fraction distance from det
+ if (iDetPos >= 0 && iDetPos < nDet - 1)
+ pImCol[iy] += (filteredProj[iDetPos] + frac * (filteredProj[iDetPos+1] - filteredProj[iDetPos])) / dL2;
+ } else if (interpType == Backprojector::INTERP_CUBIC) {
+ double d = iDetCenter + dPos; // position along detector
+ if (d >= 0 && d < nDet)
+ pImCol[iy] += pCubicInterp->interpolate (d) / dL2;
}
- } // end for y
- } // end for x
+ } // end for y
+ } // end for x
+
+ if (interpType == Backprojector::INTERP_CUBIC)
+ delete pCubicInterp;
}
void
{
double beta = view_angle;
+ CubicPolyInterpolator* pCubicInterp = NULL;
+ if (interpType == Backprojector::INTERP_CUBIC)
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
+
+#if HAVE_OPENMP
+ #pragma omp parallel for
+#endif
for (int ix = 0; ix < nx; ix++) {
ImageFileColumn pImCol = v[ix];
double rsin_t = r[ix][iy] * sin (dAngleDiff);
double dU = (m_dFocalLength + rsin_t) / m_dFocalLength;
+ double dU2 = dU * dU;
+
double dDetPos = rcos_t / dU;
- // double to scale for imaginary detector that passes through origin
- // of phantom, see Kak-Slaney Figure 3.22
- 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) {
- int iDetPos = iDetCenter + nearest<int>(dDetPos / detInc); // calc index in the filtered raysum vector
-
- if (iDetPos < 0 || iDetPos >= nDet) // check for impossible: index outside of raysum pos
- ; /// errorIndexOutsideDetector (ix, iy, beta, r[ix][iy], phi[ix][iy], dDetPos, iDetPos);
- else
- pImCol[iy] += (filteredProj[iDetPos] / (dU * dU));
+ int iDetPos = iDetCenter + nearest<int>(dPos); // calc index in the filtered raysum vector
+ if (iDetPos >= 0 && iDetPos < nDet)
+ pImCol[iy] += filteredProj[iDetPos] / dU2;
} else if (interpType == Backprojector::INTERP_LINEAR) {
- double dPos = dDetPos / detInc; // position along detector
- double dPosFloor = floor (dPos);
- int iDetPos = iDetCenter + static_cast<int>(dPosFloor);
- double frac = dPos - dPosFloor; // fraction distance from det
- if (iDetPos < 0 || iDetPos >= nDet - 1)
- ; // errorIndexOutsideDetector (ix, iy, beta, r[ix][iy], phi[ix][iy], dDetPos, iDetPos);
- else
- pImCol[iy] += (filteredProj[iDetPos] + frac * (filteredProj[iDetPos+1] - filteredProj[iDetPos])) / (dU * dU);
+ double dPosFloor = floor (dPos);
+ int iDetPos = iDetCenter + static_cast<int>(dPosFloor);
+ double frac = dPos - dPosFloor; // fraction distance from det
+ if (iDetPos >= 0 && iDetPos < nDet - 1)
+ pImCol[iy] += (filteredProj[iDetPos] + frac * (filteredProj[iDetPos+1] - filteredProj[iDetPos])) / dU2;
+ } else if (interpType == Backprojector::INTERP_CUBIC) {
+ double d = iDetCenter + dPos; // position along detector
+ if (d >= 0 && d < nDet)
+ pImCol[iy] += pCubicInterp->interpolate (d) / dU2;
}
- } // end for y
- } // end for x
+ } // end for y
+ } // end for x
+
+ if (interpType == Backprojector::INTERP_CUBIC)
+ delete pCubicInterp;
}
projects / ctsim.git / blobdiff