** This is part of the CTSim program
** Copyright (c) 1983-2001 Kevin Rosenberg
**
-** $Id: backprojectors.cpp,v 1.24 2001/01/27 21:02:20 kevin Exp $
+** $Id: backprojectors.cpp,v 1.30 2001/03/07 19:02:44 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
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_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"},
+ {"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"},
m_pBackprojectImplem->BackprojectView (viewData, viewAngle);
}
+void
+Backprojector::PostProcessing()
+{
+ if (m_pBackprojectImplem != NULL)
+ m_pBackprojectImplem->PostProcessing();
+}
+
Backprojector::~Backprojector ()
{
delete m_pBackprojectImplem;
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));
+ else if (m_idBackproject == BPROJ_IDIFF)
+ m_pBackprojectImplem = static_cast<Backproject*>(new BackprojectIntDiff (proj, im, m_idInterpolation, interpFactor));
} else {
m_fail = true;
m_failMessage = "Unable to select a backprojection method [Backprojector::initBackprojector]";
// 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)
+: proj(proj), im(im), interpType(interpType), m_interpFactor(interpFactor), m_bPostProcessingDone(false)
{
detInc = proj.detInc();
nDet = proj.nDet();
yInc = (yMax - yMin) / ny;
m_dFocalLength = proj.focalLength();
+ m_dSourceDetectorLength = proj.sourceDetectorLength();
}
Backproject::~Backproject ()
{}
+void
+Backproject::PostProcessing()
+{
+ m_bPostProcessingDone = true;
+}
+
void
Backproject::ScaleImageByRotIncrement ()
{
{
double theta = view_angle;
+ CubicPolyInterpolator* pCubicInterp = NULL;
+ if (interpType == Backprojector::INTERP_CUBIC)
+ 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 y = yMin + yInc / 2;
if (interpType == Backprojector::INTERP_NEAREST) {
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
+ 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
+ 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;
}
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);
+
for (int ix = 0; ix < nx; ix++) {
ImageFileColumn pImCol = v[ix];
if (interpType == Backprojector::INTERP_NEAREST) {
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
+ 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
+ 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
+
+ if (interpType == Backprojector::INTERP_CUBIC)
+ delete pCubicInterp;
}
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
+ 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
- if (iDetPos < 0 || iDetPos >= nDet) // check for impossible: index outside of raysum pos
- errorIndexOutsideDetector (ix, iy, theta, curDetPos, iDetPos);
- else
+ if (iDetPos >= 0 && iDetPos < nDet)
*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
+ if (iDetPos > 0 && iDetPos < nDet - 1)
*pImCol++ += filteredProj[iDetPos] + (frac * (filteredProj[iDetPos+1] - filteredProj[iDetPos]));
+ } else if (interpType == Backprojector::INTERP_CUBIC) {
+ double p = iDetCenter + curDetPos; // position along detector
+ if (p >= 0 && p < nDet)
+ *pImCol++ += pCubicInterp->interpolate (p);
}
} // 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;
-
- 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]);
- }
- } // 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;
// 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) {
if (iDetPos >= 0 && iDetPos <= iLastDet)
*pImCol++ += filteredProj[iDetPos] + (detRemainder * deltaFilteredProj[iDetPos]);
} // end for iy
- } //end linear
+ } 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 for ix
- delete deltaFilteredProj;
+ 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);
+
for (int ix = 0; ix < nx; ix++) {
ImageFileColumn pImCol = v[ix];
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
+ 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
+ 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
+
+ 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);
+
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
- 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
+ int iDetPos = iDetCenter + nearest<int>(dPos); // calc index in the filtered raysum vector
+ if (iDetPos >= 0 && iDetPos < nDet)
pImCol[iy] += (filteredProj[iDetPos] / (dU * dU));
} 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);
+ if (iDetPos >= 0 && iDetPos < nDet - 1)
+ pImCol[iy] += (filteredProj[iDetPos] + frac * (filteredProj[iDetPos+1] - filteredProj[iDetPos]))
+ / (dU * dU);
+ } else if (interpType == Backprojector::INTERP_CUBIC) {
+ double d = iDetCenter + dPos; // position along detector
+ if (d >= 0 && d < nDet)
+ pImCol[iy] += pCubicInterp->interpolate (d) / (dU * dU);
}
} // end for y
} // end for x
+
+ if (interpType == Backprojector::INTERP_CUBIC)
+ delete pCubicInterp;
}