** This is part of the CTSim program
** Copyright (c) 1983-2001 Kevin Rosenberg
**
-** $Id: backprojectors.cpp,v 1.25 2001/02/09 01:54:20 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
******************************************************************************/
#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 int Backprojector::BPROJ_IDIFF = 3;
-const char* Backprojector::s_aszBackprojectName[] =
+const char* const Backprojector::s_aszBackprojectName[] =
{
{"trig"},
{"table"},
{"diff"},
- {"diff2"},
- {"idiff2"},
- {"idiff3"},
+ {"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"},
+ {"Integer Difference Iteration"},
};
const int Backprojector::s_iBackprojectCount = sizeof(s_aszBackprojectName) / sizeof(const char*);
const int Backprojector::INTERP_3BSPLINE = 7;
#endif
-const char* Backprojector::s_aszInterpName[] =
+const char* const Backprojector::s_aszInterpName[] =
{
{"nearest"},
{"linear"},
{"cubic"},
+#if HAVE_FREQ_PREINTERP
{"freq_preinterpolationj"},
+#endif
#if HAVE_BSPLINE_INTERP
{"bspline"},
{"1bspline"},
#endif
};
-const char* Backprojector::s_aszInterpTitle[] =
+const char* const Backprojector::s_aszInterpTitle[] =
{
{"Nearest"},
{"Linear"},
{"Cubic"},
+#if HAVE_FREQ_PREINTERP
{"Frequency Preinterpolation"},
+#endif
#if HAVE_BSPLINE_INTERP
{"B-Spline"},
{"B-Spline 1st Order"},
-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
m_pBackprojectImplem->BackprojectView (viewData, viewAngle);
}
+void
+Backprojector::PostProcessing()
+{
+ if (m_pBackprojectImplem != NULL)
+ m_pBackprojectImplem->PostProcessing();
+}
+
Backprojector::~Backprojector ()
{
delete m_pBackprojectImplem;
// 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));
+ 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));
+ 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));
+ 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));
+ 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));
- 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));
+ 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]";
// 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();
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 ()
{}
+void
+Backproject::PostProcessing()
+{
+ m_bPostProcessingDone = true;
+}
+
void
Backproject::ScaleImageByRotIncrement ()
{
{
double theta = view_angle;
- CubicInterpolator* pCubicInterp = NULL;
+ CubicPolyInterpolator* pCubicInterp = NULL;
if (interpType == Backprojector::INTERP_CUBIC)
- pCubicInterp = new CubicInterpolator (filteredProj, nDet);
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
double x = xMin + xInc / 2; // Rectang coords of center of pixel
for (int ix = 0; ix < nx; x += xInc, ix++) {
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);
// 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());
BackprojectTable::~BackprojectTable ()
{
- ScaleImageByRotIncrement();
+}
+
+void
+BackprojectTable::PostProcessing()
+{
+ if (! m_bPostProcessingDone) {
+ ScaleImageByRotIncrement();
+ m_bPostProcessingDone = true;
+ }
}
void
{
double theta = view_angle;
- CubicInterpolator* pCubicInterp = NULL;
+ CubicPolyInterpolator* pCubicInterp = NULL;
if (interpType == Backprojector::INTERP_CUBIC)
- pCubicInterp = new CubicInterpolator (filteredProj, nDet);
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
for (int ix = 0; ix < nx; ix++) {
ImageFileColumn pImCol = v[ix];
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);
// 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;
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
-
- CubicInterpolator* pCubicInterp = NULL;
- if (interpType == Backprojector::INTERP_CUBIC)
- pCubicInterp = new CubicInterpolator (filteredProj, nDet);
-
- 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)
- 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)
- pImCol[iy] += ((1-frac) * filteredProj[iDetPos] + frac * filteredProj[iDetPos+1]);
- } else if (interpType = Backprojector::INTERP_CUBIC) {
- double p = iDetCenter + (curDetPos / detInc); // position along detector
- if (p >= 0 && p < nDet)
- pImCol[iy] += pCubicInterp->interpolate (p);
- }
- } // end for y
- } // end for x
-
- if (interpType == Backprojector::INTERP_CUBIC)
- delete pCubicInterp;
+ 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;
- CubicInterpolator* pCubicInterp = NULL;
- if (interpType == Backprojector::INTERP_CUBIC)
- pCubicInterp = new CubicInterpolator (filteredProj, nDet);
-
- // 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
+ CubicPolyInterpolator* pCubicInterp = NULL;
+ if (interpType == Backprojector::INTERP_CUBIC)
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
+
for (int ix = 0; ix < nx; ix++, detPosColStart += det_dx) {
double curDetPos = detPosColStart;
ImageFileColumn pImCol = v[ix];
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
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);
delete pCubicInterp;
}
-// CLASS IDENTICATION
-// BackprojectIntDiff2
-//
-// PURPOSE
-// Integer version of BackprojectDiff2
-
-void
-BackprojectIntDiff2::BackprojectView (const double* const filteredProj, const double view_angle)
-{
- double theta = view_angle;
-
- CubicInterpolator* pCubicInterp = NULL;
- if (interpType == Backprojector::INTERP_CUBIC)
- pCubicInterp = new CubicInterpolator (filteredProj, nDet);
-
- static const kint32 scale = 1 << 16;
- static const double dScale = scale;
- static const kint32 halfScale = scale / 2;
-
- const kint32 det_dx = nearest<kint32> (xInc * cos (theta) / detInc * scale);
- const kint32 det_dy = nearest<kint32> (yInc * sin (theta) / detInc * scale);
-
- // 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;
- ImageFileColumn pImCol = v[ix];
-
- for (int iy = 0; iy < ny; iy++, curDetPos += 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];
- } 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]);
- } else if (interpType = Backprojector::INTERP_CUBIC) {
- double p = iDetCenter + (static_cast<double>(curDetPos) / scale); // position along detector
- if (p >= 0 && p < nDet)
- *pImCol++ += pCubicInterp->interpolate (p);
- }
- } // end for y
- } // end for x
-
- 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
static const int scaleShift = 16;
kint32 detPosColStart = nearest<kint32> ((start_r * cos (theta - start_phi) / detInc + iDetCenter) * scale);
double* deltaFilteredProj = NULL;
- CubicInterpolator* pCubicInterp = NULL;
+ CubicPolyInterpolator* pCubicInterp = NULL;
if (interpType == Backprojector::INTERP_LINEAR) {
// precalculate scaled difference for linear interpolation
deltaFilteredProj = new double [nDet];
deltaFilteredProj[i] = (filteredProj[i+1] - filteredProj[i]) * dInvScale;
deltaFilteredProj[nDet - 1] = 0; // last detector
} else if (interpType == Backprojector::INTERP_CUBIC) {
- pCubicInterp = new CubicInterpolator (filteredProj, nDet);
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
}
int iLastDet = nDet - 1;
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<double>(curDetPos) / 65536);
}
- } // end cubic
+ } // end Cubic
} // end for ix
if (interpType == Backprojector::INTERP_LINEAR)
{
double beta = view_angle;
- CubicInterpolator* pCubicInterp = NULL;
+ CubicPolyInterpolator* pCubicInterp = NULL;
if (interpType == Backprojector::INTERP_CUBIC)
- pCubicInterp = new CubicInterpolator (filteredProj, nDet);
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
for (int ix = 0; ix < nx; ix++) {
ImageFileColumn pImCol = v[ix];
{
double beta = view_angle;
- CubicInterpolator* pCubicInterp = NULL;
+ CubicPolyInterpolator* pCubicInterp = NULL;
if (interpType == Backprojector::INTERP_CUBIC)
- pCubicInterp = new CubicInterpolator (filteredProj, nDet);
+ pCubicInterp = new CubicPolyInterpolator (filteredProj, nDet);
for (int ix = 0; ix < nx; ix++) {
ImageFileColumn pImCol = v[ix];
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) {
projects / ctsim.git / blobdiff