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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/Projector2D.h"
#include "astra/ParallelVecProjectionGeometry2D.h"
#include "astra/FanFlatProjectionGeometry2D.h"
#include "astra/FanFlatVecProjectionGeometry2D.h"
#include "astra/SparseMatrixProjectionGeometry2D.h"
#include "astra/SparseMatrix.h"
namespace astra
{
//----------------------------------------------------------------------------------------
// constructor
CProjector2D::CProjector2D() : configCheckData(0)
{
m_bIsInitialized = false;
}
//----------------------------------------------------------------------------------------
// constructor
CProjector2D::CProjector2D(CProjectionGeometry2D* _pProjectionGeometry, CVolumeGeometry2D* _pVolumeGeometry) : configCheckData(0)
{
m_pProjectionGeometry = _pProjectionGeometry->clone();
m_pVolumeGeometry = _pVolumeGeometry->clone();
m_bIsInitialized = true;
}
//----------------------------------------------------------------------------------------
// destructor
CProjector2D::~CProjector2D()
{
clear();
}
//---------------------------------------------------------------------------------------
// Clear - Constructors
void CProjector2D::_clear()
{
m_pProjectionGeometry = NULL;
m_pVolumeGeometry = NULL;
m_bIsInitialized = false;
}
//---------------------------------------------------------------------------------------
// Clear - Public
void CProjector2D::clear()
{
if (m_pProjectionGeometry) {
delete m_pProjectionGeometry;
m_pProjectionGeometry = NULL;
}
if (m_pVolumeGeometry) {
delete m_pVolumeGeometry;
m_pVolumeGeometry = NULL;
}
m_bIsInitialized = false;
}
//---------------------------------------------------------------------------------------
// Check
bool CProjector2D::_check()
{
// check pointers
ASTRA_CONFIG_CHECK(m_pProjectionGeometry, "Projector2D", "Invalid Projection Geometry Object.");
ASTRA_CONFIG_CHECK(m_pVolumeGeometry, "Projector2D", "Invalid Volume Geometry Object.");
// check initializations
ASTRA_CONFIG_CHECK(m_pProjectionGeometry->isInitialized(), "Projector2D", "Projection Geometry Object Not Initialized.");
ASTRA_CONFIG_CHECK(m_pVolumeGeometry->isInitialized(), "Projector2D", "Volume Geometry Object Not Initialized.");
// success
return true;
}
//---------------------------------------------------------------------------------------
// Initialize, use a Config object
bool CProjector2D::initialize(const Config& _cfg)
{
ASTRA_ASSERT(_cfg.self);
ConfigStackCheck<CProjector2D> CC("Projector2D", this, _cfg);
// if already initialized, clear first
if (m_bIsInitialized) {
clear();
}
// required: ProjectionGeometry
XMLNode node = _cfg.self.getSingleNode("ProjectionGeometry");
ASTRA_CONFIG_CHECK(node, "Projector2D", "No ProjectionGeometry tag specified.");
// FIXME: Change how the base class is created. (This is duplicated
// in astra_mex_data2d.cpp.)
std::string type = node.getAttribute("type");
if (type == "sparse_matrix") {
m_pProjectionGeometry = new CSparseMatrixProjectionGeometry2D();
m_pProjectionGeometry->initialize(Config(node));
} else if (type == "fanflat") {
CFanFlatProjectionGeometry2D* pFanFlatProjectionGeometry = new CFanFlatProjectionGeometry2D();
pFanFlatProjectionGeometry->initialize(Config(node));
m_pProjectionGeometry = pFanFlatProjectionGeometry;
} else if (type == "fanflat_vec") {
CFanFlatVecProjectionGeometry2D* pFanFlatVecProjectionGeometry = new CFanFlatVecProjectionGeometry2D();
pFanFlatVecProjectionGeometry->initialize(Config(node));
m_pProjectionGeometry = pFanFlatVecProjectionGeometry;
} else if (type == "parallel_vec") {
CParallelVecProjectionGeometry2D* pParallelVecProjectionGeometry = new CParallelVecProjectionGeometry2D();
pParallelVecProjectionGeometry->initialize(Config(node));
m_pProjectionGeometry = pParallelVecProjectionGeometry;
} else {
m_pProjectionGeometry = new CParallelProjectionGeometry2D();
m_pProjectionGeometry->initialize(Config(node));
}
// "node" is deleted by the temp Config(node) objects
ASTRA_CONFIG_CHECK(m_pProjectionGeometry->isInitialized(), "Projector2D", "ProjectionGeometry not initialized.");
CC.markNodeParsed("ProjectionGeometry");
// required: VolumeGeometry
node = _cfg.self.getSingleNode("VolumeGeometry");
ASTRA_CONFIG_CHECK(node, "Projector2D", "No VolumeGeometry tag specified.");
m_pVolumeGeometry = new CVolumeGeometry2D();
m_pVolumeGeometry->initialize(Config(node));
// "node" is deleted by the temp Config(node) object
ASTRA_CONFIG_CHECK(m_pVolumeGeometry->isInitialized(), "Projector2D", "VolumeGeometry not initialized.");
CC.markNodeParsed("VolumeGeometry");
return true;
}
//----------------------------------------------------------------------------------------
// weights of each detector in a projection angle
void CProjector2D::computeProjectionRayWeights(int _iProjection, SPixelWeight* _pfWeightedPixels, int* _piRayStoredPixelCount)
{
int iPixelBufferSize = getProjectionWeightsCount(_iProjection);
int iDetector;
for(iDetector = m_pProjectionGeometry->getDetectorCount()-1; iDetector >= 0; --iDetector) {
computeSingleRayWeights(_iProjection, // projector index
iDetector, // detector index
&_pfWeightedPixels[iDetector*iPixelBufferSize], // pixel buffer
iPixelBufferSize, // pixel buffer size
_piRayStoredPixelCount[iDetector]); // stored pixel count
}
}
//----------------------------------------------------------------------------------------
// explicit projection matrix
CSparseMatrix* CProjector2D::getMatrix()
{
unsigned int iProjectionCount = m_pProjectionGeometry->getProjectionAngleCount();
unsigned int iDetectorCount = m_pProjectionGeometry->getDetectorCount();
unsigned int iRayCount = iProjectionCount * iDetectorCount;
unsigned int iVolumeSize = m_pVolumeGeometry->getGridTotCount();
unsigned long lSize = 0;
unsigned int iMaxRayLength = 0;
for (unsigned int i = 0; i < iProjectionCount; ++i) {
unsigned int iRayLength = getProjectionWeightsCount(i);
lSize += iDetectorCount * iRayLength;
if (iRayLength > iMaxRayLength)
iMaxRayLength = iRayLength;
}
CSparseMatrix* pMatrix = new CSparseMatrix(iRayCount, iVolumeSize, lSize);
if (!pMatrix || !pMatrix->isInitialized()) {
delete pMatrix;
return 0;
}
SPixelWeight* pEntries = new SPixelWeight[iMaxRayLength];
unsigned long lMatrixIndex = 0;
for (unsigned int iRay = 0; iRay < iRayCount; ++iRay) {
pMatrix->m_plRowStarts[iRay] = lMatrixIndex;
int iPixelCount;
int iProjIndex, iDetIndex;
m_pProjectionGeometry->indexToAngleDetectorIndex(iRay, iProjIndex, iDetIndex);
computeSingleRayWeights(iProjIndex, iDetIndex, pEntries, iMaxRayLength, iPixelCount);
for (int i = 0; i < iPixelCount; ++i) {
pMatrix->m_piColIndices[lMatrixIndex] = pEntries[i].m_iIndex;
pMatrix->m_pfValues[lMatrixIndex] = pEntries[i].m_fWeight;
++lMatrixIndex;
}
}
pMatrix->m_plRowStarts[iRayCount] = lMatrixIndex;
delete[] pEntries;
return pMatrix;
}
} // end namespace
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