** This is part of the CTSim program
** Copyright (c) 1983-2001 Kevin Rosenberg
**
-** $Id: projections.cpp,v 1.72 2001/03/29 21:25:49 kevin Exp $
+** $Id: projections.cpp,v 1.73 2001/03/30 19:17:32 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
if (! v || nx == 0 || ny == 0)
return false;
- if (m_geometry != Scanner::GEOMETRY_PARALLEL) {
- sys_error (ERR_WARNING, "convertFFTPolar supports Parallel only");
- return false;
- }
+ Projections* pProj = this;
+ if (m_geometry == Scanner::GEOMETRY_EQUIANGULAR || m_geometry == Scanner::GEOMETRY_EQUILINEAR)
+ pProj = interpolateToParallel();
int iInterpDet = nx;
+// int iInterpDet = pProj->m_nDet;
int iNumInterpDetWithZeros = ProcessSignal::addZeropadFactor (iInterpDet, iZeropad);
double dZeropadRatio = static_cast<double>(iNumInterpDetWithZeros) / static_cast<double>(iInterpDet);
fftw_plan plan = fftw_create_plan (iNumInterpDetWithZeros, FFTW_FORWARD, FFTW_IN_PLACE | FFTW_ESTIMATE | FFTW_USE_WISDOM);
fftw_complex* pcIn = new fftw_complex [iNumInterpDetWithZeros];
- std::complex<double>** ppcDetValue = new std::complex<double>* [m_nView];
- double dInterpScale = (m_nDet-1) / static_cast<double>(iInterpDet-1) / SQRT2;
+ std::complex<double>** ppcDetValue = new std::complex<double>* [pProj->m_nView];
+ double dInterpScale = (pProj->m_nDet-1) / static_cast<double>(iInterpDet-1) / SQRT2;
double dFFTScale = 1. / static_cast<double>(iInterpDet * iInterpDet);
int iMidPoint = iInterpDet / 2;
double dMidPoint = static_cast<double>(iInterpDet) / 2.;
int iZerosAdded = iNumInterpDetWithZeros - iInterpDet;
+
+ // For each view, interpolate to nx length, shift to center at origin, and FFt transform
for (unsigned int iView = 0; iView < m_nView; iView++) {
- DetectorValue* detval = getDetectorArray(iView).detValues();
- LinearInterpolator<DetectorValue> projInterp (detval, m_nDet);
+ DetectorValue* detval = pProj->getDetectorArray(iView).detValues();
+ LinearInterpolator<DetectorValue> projInterp (detval, pProj->m_nDet);
for (unsigned int iDet = 0; iDet < iInterpDet; iDet++) {
double dInterpPos = (m_nDet / 2.) + (iDet - dMidPoint) * dInterpScale;
pcIn[iDet].re = projInterp.interpolate (dInterpPos) * dInterpScale;
pcIn[iDet].im = 0;
}
+
Fourier::shuffleFourierToNaturalOrder (pcIn, iInterpDet);
if (iZerosAdded > 0) {
for (unsigned int iDet1 = iMidPoint; iDet1 < iInterpDet; iDet1++)
Array2d<double> adDet (nx, ny);
double** ppdView = adView.getArray();
double** ppdDet = adDet.getArray();
- calcArrayPolarCoordinates (nx, ny, ppdView, ppdDet, iNumInterpDetWithZeros, dZeropadRatio,
- m_detInc * dInterpScale);
+ pProj->calcArrayPolarCoordinates (nx, ny, ppdView, ppdDet, iNumInterpDetWithZeros, dZeropadRatio,
+ pProj->m_detInc * dInterpScale);
+
+ pProj->interpolatePolar (v, vImag, nx, ny, ppcDetValue, ppdView, ppdDet, pProj->m_nView, pProj->m_nDet,
+ iNumInterpDetWithZeros, iInterpolationID);
- interpolatePolar (v, vImag, nx, ny, ppcDetValue, ppdView, ppdDet, m_nView, m_nDet, iNumInterpDetWithZeros,
- iInterpolationID);
+ if (m_geometry == Scanner::GEOMETRY_EQUIANGULAR || m_geometry == Scanner::GEOMETRY_EQUILINEAR)
+ delete pProj;
for (int i = 0; i < m_nView; i++)
delete [] ppcDetValue[i];