** This is part of the CTSim program
** Copyright (c) 1983-2001 Kevin Rosenberg
**
-** $Id: projections.cpp,v 1.65 2001/03/13 10:35:06 kevin Exp $
+** $Id: projections.cpp,v 1.66 2001/03/13 14:53:44 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
double** ppdView = adView.getArray();
double** ppdDet = adDet.getArray();
- if (! pProj->calcArrayPolarCoordinates (nx, ny, ppdView, ppdDet))
- return false;
+ pProj->calcArrayPolarCoordinates (nx, ny, ppdView, ppdDet, m_nDet, 1.);
std::complex<double>** ppcDetValue = new std::complex<double>* [m_nView];
unsigned int iView;
for (iView = 0; iView < m_nView; iView++) {
ppcDetValue[iView] = new std::complex<double> [m_nDet];
+ DetectorValue* detval = pProj->getDetectorArray (iView).detValues();
for (unsigned int iDet = 0; iDet < m_nDet; iDet++)
- ppcDetValue[iView][iDet] = std::complex<double>(pProj->getDetectorArray (iView).detValues()[iDet], 0);
+ ppcDetValue[iView][iDet] = std::complex<double>(detval[iDet], 0);
}
- pProj->interpolatePolar (v, vImag, nx, ny, ppcDetValue, ppdView, ppdDet, pProj->m_nView, pProj->m_nDet, iInterpolationID);
+ pProj->interpolatePolar (v, vImag, nx, ny, ppcDetValue, ppdView, ppdDet, pProj->m_nView, pProj->m_nDet, pProj->m_nDet, iInterpolationID);
for (iView = 0; iView < m_nView; iView++)
delete [] ppcDetValue[iView];
bool
Projections::convertFFTPolar (ImageFile& rIF, int iInterpolationID, int iZeropad)
{
+#ifndef HAVE_FFT
+ return false;
+#else
unsigned int nx = rIF.nx();
unsigned int ny = rIF.ny();
ImageFileArray v = rIF.getArray();
return false;
}
-#ifndef HAVE_FFT
- return false;
-#else
Array2d<double> adView (nx, ny);
Array2d<double> adDet (nx, ny);
double** ppdView = adView.getArray();
double** ppdDet = adDet.getArray();
std::complex<double>** ppcDetValue = new std::complex<double>* [m_nView];
- unsigned int iView;
- double* pdDet = new double [m_nDet];
- fftw_complex* pcIn = new fftw_complex [m_nDet];
- fftw_plan plan = fftw_create_plan (m_nDet, FFTW_FORWARD, FFTW_IN_PLACE);
- for (iView = 0; iView < m_nView; iView++) {
- unsigned int iDet;
- for (iDet = 0; iDet < m_nDet; iDet++) {
- pcIn[iDet].re = getDetectorArray(iView).detValues()[iDet];
+ int iNumDetWithZeros = ProcessSignal::addZeropadFactor (m_nDet, iZeropad);
+ double dZeropadRatio = iNumDetWithZeros / static_cast<double>(m_nDet);
+
+ double* pdDet = new double [iNumDetWithZeros];
+ fftw_complex* pcIn = new fftw_complex [iNumDetWithZeros];
+ fftw_plan plan = fftw_create_plan (iNumDetWithZeros, FFTW_FORWARD, FFTW_IN_PLACE);
+
+ for (unsigned int iView = 0; iView < m_nView; iView++) {
+ DetectorValue* detval = getDetectorArray(iView).detValues();
+ for (unsigned int iDet = 0; iDet < m_nDet; iDet++) {
+ pcIn[iDet].re = detval[iDet];
pcIn[iDet].im = 0;
}
+ for (unsigned int iDet2 = m_nDet; iDet2 < iNumDetWithZeros; iDet2++)
+ pcIn[iDet2].re = pcIn[iDet2].im = 0;
+
fftw_one (plan, pcIn, NULL);
- ppcDetValue[iView] = new std::complex<double> [m_nDet];
- for (iDet = 0; iDet < m_nDet; iDet++)
- ppcDetValue[iView][iDet] = std::complex<double> (pcIn[iDet].re, pcIn[iDet].im);
- Fourier::shuffleFourierToNaturalOrder (ppcDetValue[iView], m_nDet);
+ ppcDetValue[iView] = new std::complex<double> [iNumDetWithZeros];
+ for (unsigned int iD = 0; iD < iNumDetWithZeros; iD++)
+ ppcDetValue[iView][iD] = std::complex<double> (pcIn[iD].re, pcIn[iD].im);
+//ppcDetValue[iView][iD] = std::complex<double> (std::abs(std::complex<double>(pcIn[iD].re, pcIn[iD].im)), 0);
+ Fourier::shuffleFourierToNaturalOrder (ppcDetValue[iView], iNumDetWithZeros);
}
fftw_destroy_plan (plan);
delete [] pcIn;
- bool bError = calcArrayPolarCoordinates (nx, ny, ppdView, ppdDet);
-
- if (! bError)
- interpolatePolar (v, vImag, nx, ny, ppcDetValue, ppdView, ppdDet, m_nView, m_nDet, iInterpolationID);
+ calcArrayPolarCoordinates (nx, ny, ppdView, ppdDet, iNumDetWithZeros, dZeropadRatio);
+ interpolatePolar (v, vImag, nx, ny, ppcDetValue, ppdView, ppdDet, m_nView, m_nDet, iNumDetWithZeros,
+ iInterpolationID);
- for (iView = 0; iView < m_nView; iView++)
- delete [] ppcDetValue[iView];
+ for (int i = 0; i < m_nView; i++)
+ delete [] ppcDetValue[i];
delete [] ppcDetValue;
- return bError;
+ return true;
#endif
}
-bool
-Projections::calcArrayPolarCoordinates (unsigned int nx, unsigned int ny, double** ppdView, double** ppdDet)
+void
+Projections::calcArrayPolarCoordinates (unsigned int nx, unsigned int ny, double** ppdView, double** ppdDet,
+ int iNumDetWithZeros, double dZeropadRatio)
{
double xMin = -phmLen() / 2;
double xMax = xMin + phmLen();
double yMin = -phmLen() / 2;
double yMax = yMin + phmLen();
-
+ double xCent = (xMin + xMax) / 2;
+ double yCent = (yMin + yMax) / 2;
+
+ xMin = (xMin - xCent) * dZeropadRatio + xCent;
+ xMax = (xMax - xCent) * dZeropadRatio + xCent;
+ yMin = (yMin - yCent) * dZeropadRatio + yCent;
+ yMax = (yMax - yCent) * dZeropadRatio + yCent;
+
double xInc = (xMax - xMin) / nx; // size of cells
double yInc = (yMax - yMin) / ny;
-
- int iDetCenter = (m_nDet - 1) / 2; // index refering to L=0 projection
+
+ // +1 is correct for frequency data, ndet-1 is correct for projections
+ int iDetCenter = (iNumDetWithZeros - 1) / 2; // index refering to L=0 projection
+ if (iNumDetWithZeros % 2 == 0)
+ iDetCenter = (iNumDetWithZeros + 1) / 2;
// Calculates polar coordinates (view#, det#) for each point on phantom grid
double x = xMin + xInc / 2; // Rectang coords of center of pixel
double r = ::sqrt (x * x + y * y);
double phi = atan2 (y, x);
+ if (phi < 0)
+ phi += TWOPI;
+
if (phi >= PI) {
phi -= PI;
- } else if (phi < 0) {
- phi += PI;
- } else
r = -r;
+ }
ppdView[ix][iy] = (phi - m_rotStart) / m_rotInc;
ppdDet[ix][iy] = (r / m_detInc) + iDetCenter;
}
}
-
- return true;
}
void
Projections::interpolatePolar (ImageFileArray& v, ImageFileArray& vImag,
- unsigned int nx, unsigned int ny, std::complex<double>** ppcDetValue,
- double** ppdView, double** ppdDet, unsigned int nView, unsigned int nDet, int iInterpolationID)
+ unsigned int nx, unsigned int ny, std::complex<double>** ppcDetValue, double** ppdView,
+ double** ppdDet, unsigned int nView, unsigned int nDet, unsigned int nDetWithZeros, int iInterpolationID)
{
+
for (unsigned int ix = 0; ix < ny; ix++) {
for (unsigned int iy = 0; iy < ny; iy++) {
if (iInterpolationID == POLAR_INTERP_NEAREST) {
iView = 0;
// iDet = m_nDet - iDet;
}
- if (iDet >= 0 && iDet < nDet && iView >= 0 && iView < nView) {
+ if (iDet >= 0 && iDet < nDetWithZeros && iView >= 0 && iView < nView) {
v[ix][iy] = ppcDetValue[iView][iDet].real();
if (vImag)
vImag[ix][iy] = ppcDetValue[iView][iDet].imag();
v2 = ppcDetValue[iFloorView + 1][iFloorDet];
else
v2 = ppcDetValue[0][iFloorDet];
- if (iFloorDet < nDet - 1)
+ if (iFloorDet < nDetWithZeros - 1)
v4 = ppcDetValue[iFloorView][iFloorDet+1];
else
v4 = v1;
- if (iFloorView < nView - 1 && iFloorDet < nDet - 1)
+ if (iFloorView < nView - 1 && iFloorDet < nDetWithZeros - 1)
v3 = ppcDetValue [iFloorView+1][iFloorDet+1];
else if (iFloorView < nView - 1)
v3 = v2;
projects / ctsim.git / blobdiff