X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=libctsim%2Fprojections.cpp;h=846daf3f03ea8f9ef45f67acbe8bd2954f7376d0;hb=e96390a84a8df18305c63263466c522fbc680055;hp=bdf607369f96d645a7226af85d41a90128828fe2;hpb=23f5654dacb1952c15bda92c2606fae3a55e48ad;p=ctsim.git diff --git a/libctsim/projections.cpp b/libctsim/projections.cpp index bdf6073..846daf3 100644 --- a/libctsim/projections.cpp +++ b/libctsim/projections.cpp @@ -8,7 +8,7 @@ ** This is part of the CTSim program ** Copyright (C) 1983-2000 Kevin Rosenberg ** -** $Id: projections.cpp,v 1.37 2001/01/04 21:28:41 kevin Exp $ +** $Id: projections.cpp,v 1.41 2001/01/07 23:18:13 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 @@ -37,14 +37,14 @@ const char* Projections::s_aszInterpName[] = { {"nearest"}, {"bilinear"}, - {"bicubic"}, +// {"bicubic"}, }; const char* Projections::s_aszInterpTitle[] = { {"Nearest"}, {"Bilinear"}, - {"Bicubic"}, +// {"Bicubic"}, }; const int Projections::s_iInterpCount = sizeof(s_aszInterpName) / sizeof(char*); @@ -696,6 +696,63 @@ Projections::convertPolar (ImageFile& rIF, int iInterpolationID) return true; } + +bool +Projections::convertFFTPolar (ImageFile& rIF, int iInterpolationID, int iZeropad) +{ + unsigned int nx = rIF.nx(); + unsigned int ny = rIF.ny(); + ImageFileArray v = rIF.getArray(); + if (! rIF.isComplex()) + rIF.convertRealToComplex(); + ImageFileArray vImag = rIF.getImaginaryArray(); + + if (! v || nx == 0 || ny == 0) + return false; + +#ifndef HAVE_FFT + return false; +#else + Array2d adView (nx, ny); + Array2d adDet (nx, ny); + double** ppdView = adView.getArray(); + double** ppdDet = adDet.getArray(); + + std::complex** ppcDetValue = new std::complex* [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]; + pcIn[iDet].im = 0; + } + fftw_one (plan, pcIn, NULL); + ppcDetValue[iView] = new std::complex [m_nDet]; + for (iDet = 0; iDet < m_nDet; iDet++) + ppcDetValue[iView][iDet] = std::complex (pcIn[iDet].re, pcIn[iDet].im); + Fourier::shuffleFourierToNaturalOrder (ppcDetValue[iView], m_nDet); + } + + fftw_destroy_plan (plan); + delete [] pcIn; + + calcArrayPolarCoordinates (nx, ny, ppdView, ppdDet); + + interpolatePolar (v, vImag, nx, ny, ppcDetValue, ppdView, ppdDet, m_nView, m_nDet, iInterpolationID); + + for (iView = 0; iView < m_nView; iView++) + delete [] ppcDetValue[iView]; + delete [] ppcDetValue; + + return true; +#endif +} + + void Projections::calcArrayPolarCoordinates (unsigned int nx, unsigned int ny, double** ppdView, double** ppdDet) { @@ -711,8 +768,10 @@ Projections::calcArrayPolarCoordinates (unsigned int nx, unsigned int ny, double if (m_geometry != Scanner::GEOMETRY_PARALLEL) { sys_error (ERR_WARNING, "convertPolar supports Parallel only"); + return; } + // Calculates polar coordinates (view#, det#) for each point on phantom grid double x = xMin + xInc / 2; // Rectang coords of center of pixel for (unsigned int ix = 0; ix < nx; x += xInc, ix++) { double y = yMin + yInc / 2; @@ -743,8 +802,10 @@ Projections::interpolatePolar (ImageFileArray& v, ImageFileArray& vImag, if (iInterpolationID == POLAR_INTERP_NEAREST) { int iView = nearest (ppdView[ix][iy]); int iDet = nearest (ppdDet[ix][iy]); - if (iView == nView) - iView = nView - 1; + if (iView == nView) { + iView = 0; + // iDet = m_nDet - iDet; + } if (iDet >= 0 && iDet < nDet && iView >= 0 && iView < nView) { v[ix][iy] = ppcDetValue[iView][iDet].real(); if (vImag) @@ -755,9 +816,9 @@ Projections::interpolatePolar (ImageFileArray& v, ImageFileArray& vImag, v[ix][iy] = 0; } } else if (iInterpolationID == POLAR_INTERP_BILINEAR) { - int iFloorView = ppdView[ix][iy]; + int iFloorView = static_cast(ppdView[ix][iy]); double dFracView = ppdView[ix][iy] - iFloorView; - int iFloorDet = ppdDet[ix][iy]; + int iFloorDet = static_cast(ppdDet[ix][iy]); double dFracDet = ppdDet[ix][iy] - iFloorDet; if (iFloorDet >= 0 && iFloorView >= 0) { @@ -766,7 +827,7 @@ Projections::interpolatePolar (ImageFileArray& v, ImageFileArray& vImag, if (iFloorView < nView - 1) v2 = ppcDetValue[iFloorView + 1][iFloorDet]; else - v2 = v1; + v2 = ppcDetValue[0][iFloorDet]; if (iFloorDet < nDet - 1) v4 = ppcDetValue[iFloorView][iFloorDet+1]; else @@ -774,10 +835,12 @@ Projections::interpolatePolar (ImageFileArray& v, ImageFileArray& vImag, if (iFloorView < nView - 1 && iFloorDet < nDet - 1) v3 = ppcDetValue [iFloorView+1][iFloorDet+1]; else if (iFloorView < nView - 1) - v4 = v2; + v3 = v2; else - v4 = v1; - std::complex vInterp = v1 + dFracView * (v2 - v1) + dFracDet * (v4 - v1); + v3 = ppcDetValue[0][iFloorDet+1]; + std::complex vInterp = (1 - dFracView) * (1 - dFracDet) * v1 + + dFracView * (1 - dFracDet) * v2 + dFracView * dFracDet * v3 + + dFracDet * (1 - dFracView) * v4; v[ix][iy] = vInterp.real(); if (vImag) vImag[ix][iy] = vInterp.imag(); @@ -797,57 +860,4 @@ Projections::interpolatePolar (ImageFileArray& v, ImageFileArray& vImag, } } -bool -Projections::convertFFTPolar (ImageFile& rIF, int iInterpolationID, int iZeropad) -{ - unsigned int nx = rIF.nx(); - unsigned int ny = rIF.ny(); - ImageFileArray v = rIF.getArray(); - if (! rIF.isComplex()) - rIF.convertRealToComplex(); - ImageFileArray vImag = rIF.getImaginaryArray(); - - if (! v || nx == 0 || ny == 0) - return false; - - Array2d adView (nx, ny); - Array2d adDet (nx, ny); - double** ppdView = adView.getArray(); - double** ppdDet = adDet.getArray(); - - std::complex** ppcDetValue = new std::complex* [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++) { - ppcDetValue[iView] = new std::complex [m_nDet]; - unsigned int iDet; - for (iDet = 0; iDet < m_nDet; iDet++) { - pcIn[iDet].re = getDetectorArray(iView).detValues()[iDet]; - pcIn[iDet].im = 0; - } - fftw_one (plan, pcIn, NULL); - for (iDet = 0; iDet < m_nDet; iDet++) - ppcDetValue[iView][iDet] = std::complex (pcIn[iDet].re, pcIn[iDet].im); - Fourier::shuffleFourierToNaturalOrder (ppcDetValue[iView], m_nDet); - } - - fftw_destroy_plan (plan); - - delete [] pcIn; - - calcArrayPolarCoordinates (nx, ny, ppdView, ppdDet); - - interpolatePolar (v, vImag, nx, ny, ppcDetValue, ppdView, ppdDet, m_nView, m_nDet, iInterpolationID); - - for (iView = 0; iView < m_nView; iView++) - delete [] ppcDetValue[iView]; - delete [] ppcDetValue; - - return true; -} - -