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/*
-----------------------------------------------------------------------
Copyright: 2010-2021, imec Vision Lab, University of Antwerp
2014-2021, CWI, Amsterdam
Contact: astra@astra-toolbox.com
Website: http://www.astra-toolbox.com/
This file is part of the ASTRA Toolbox.
The ASTRA Toolbox is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The ASTRA Toolbox is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
*/
#include "astra/cuda/2d/em.h"
#include "astra/cuda/2d/util.h"
#include "astra/cuda/2d/arith.h"
#include <cstdio>
#include <cassert>
namespace astraCUDA {
// TODO: ensure non-negativity somewhere??
EM::EM()
{
D_projData = 0;
D_tmpData = 0;
D_pixelWeight = 0;
}
EM::~EM()
{
reset();
}
void EM::reset()
{
cudaFree(D_projData);
cudaFree(D_tmpData);
cudaFree(D_pixelWeight);
D_projData = 0;
D_tmpData = 0;
D_pixelWeight = 0;
ReconAlgo::reset();
}
bool EM::init()
{
allocateVolumeData(D_pixelWeight, pixelPitch, dims);
zeroVolumeData(D_pixelWeight, pixelPitch, dims);
allocateVolumeData(D_tmpData, tmpPitch, dims);
zeroVolumeData(D_tmpData, tmpPitch, dims);
allocateProjectionData(D_projData, projPitch, dims);
zeroProjectionData(D_projData, projPitch, dims);
// We can't precompute pixelWeights when using a volume mask
#if 0
if (!useVolumeMask)
#endif
precomputeWeights();
// TODO: check if allocations succeeded
return true;
}
bool EM::precomputeWeights()
{
zeroVolumeData(D_pixelWeight, pixelPitch, dims);
#if 0
if (useSinogramMask) {
callBP(D_pixelWeight, pixelPitch, D_smaskData, smaskPitch);
} else
#endif
{
processSino<opSet>(D_projData, 1.0f, projPitch, dims);
callBP(D_pixelWeight, pixelPitch, D_projData, projPitch, 1.0f);
}
processVol<opInvert>(D_pixelWeight, pixelPitch, dims);
#if 0
if (useVolumeMask) {
// scale pixel weights with mask to zero out masked pixels
processVol<opMul>(D_pixelWeight, D_maskData, pixelPitch, dims);
}
#endif
return true;
}
bool EM::iterate(unsigned int iterations)
{
#if 0
if (useVolumeMask)
precomputeWeights();
#endif
// iteration
for (unsigned int iter = 0; iter < iterations && !astra::shouldAbort(); ++iter) {
// Do FP of volumeData
zeroProjectionData(D_projData, projPitch, dims);
callFP(D_volumeData, volumePitch, D_projData, projPitch, 1.0f);
// Divide sinogram by FP (into projData)
processSino<opDividedBy>(D_projData, D_sinoData, projPitch, dims);
// Do BP of projData into tmpData
zeroVolumeData(D_tmpData, tmpPitch, dims);
callBP(D_tmpData, tmpPitch, D_projData, projPitch, 1.0f);
// Multiply volumeData with tmpData divided by pixel weights
processVol<opMul2>(D_volumeData, D_tmpData, D_pixelWeight, pixelPitch, dims);
}
return true;
}
float EM::computeDiffNorm()
{
// copy sinogram to projection data
duplicateProjectionData(D_projData, D_sinoData, sinoPitch, dims);
// do FP, subtracting projection from sinogram
if (useVolumeMask) {
duplicateVolumeData(D_tmpData, D_volumeData, volumePitch, dims);
processVol<opMul>(D_tmpData, D_maskData, tmpPitch, dims);
callFP(D_tmpData, tmpPitch, D_projData, projPitch, -1.0f);
} else {
callFP(D_volumeData, volumePitch, D_projData, projPitch, -1.0f);
}
// compute norm of D_projData
float s = dotProduct2D(D_projData, projPitch, dims.iProjDets, dims.iProjAngles);
return sqrt(s);
}
}
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