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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/>.
-----------------------------------------------------------------------
*/
//----------------------------------------------------------------------------------------
// PROJECT ALL
template <typename Policy>
void CSparseMatrixProjector2D::project(Policy& p)
{
ASTRA_ASSERT(m_bIsInitialized);
for (int i = 0; i < m_pProjectionGeometry->getProjectionAngleCount(); ++i)
for (int j = 0; j < m_pProjectionGeometry->getDetectorCount(); ++j)
projectSingleRay(i, j, p);
}
//----------------------------------------------------------------------------------------
// PROJECT SINGLE PROJECTION
template <typename Policy>
void CSparseMatrixProjector2D::projectSingleProjection(int _iProjection, Policy& p)
{
ASTRA_ASSERT(m_bIsInitialized);
for (int j = 0; j < m_pProjectionGeometry->getDetectorCount(); ++j)
projectSingleRay(_iProjection, j, p);
}
//----------------------------------------------------------------------------------------
// PROJECT SINGLE RAY
template <typename Policy>
void CSparseMatrixProjector2D::projectSingleRay(int _iProjection, int _iDetector, Policy& p)
{
ASTRA_ASSERT(m_bIsInitialized);
int iRayIndex = _iProjection * m_pProjectionGeometry->getDetectorCount() + _iDetector;
const CSparseMatrix* pMatrix = dynamic_cast<CSparseMatrixProjectionGeometry2D*>(m_pProjectionGeometry)->getMatrix();
// POLICY: RAY PRIOR
if (!p.rayPrior(iRayIndex)) return;
const unsigned int* piColIndices;
const float32* pfValues;
unsigned int iSize;
pMatrix->getRowData(iRayIndex, iSize, pfValues, piColIndices);
for (unsigned int i = 0; i < iSize; ++i) {
unsigned int iVolumeIndex = piColIndices[i];
// POLICY: PIXEL PRIOR
if (p.pixelPrior(iVolumeIndex)) {
// POLICY: ADD
p.addWeight(iRayIndex, iVolumeIndex, pfValues[i]);
// POLICY: PIXEL POSTERIOR
p.pixelPosterior(iVolumeIndex);
}
}
// POLICY: RAY POSTERIOR
p.rayPosterior(iRayIndex);
}
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