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/*
-----------------------------------------------------------------------
Copyright: 2010-2016, iMinds-Vision Lab, University of Antwerp
2014-2016, CWI, Amsterdam
Contact: astra@uantwerpen.be
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/ParallelBeamStripKernelProjector2D.h"
#include <cmath>
#include <algorithm>
#include "astra/DataProjectorPolicies.h"
using namespace std;
using namespace astra;
#include "astra/ParallelBeamStripKernelProjector2D.inl"
// type of the projector, needed to register with CProjectorFactory
std::string CParallelBeamStripKernelProjector2D::type = "strip";
//----------------------------------------------------------------------------------------
// default constructor
CParallelBeamStripKernelProjector2D::CParallelBeamStripKernelProjector2D()
{
_clear();
}
//----------------------------------------------------------------------------------------
// constructor
CParallelBeamStripKernelProjector2D::CParallelBeamStripKernelProjector2D(CParallelProjectionGeometry2D* _pProjectionGeometry,
CVolumeGeometry2D* _pReconstructionGeometry)
{
_clear();
initialize(_pProjectionGeometry, _pReconstructionGeometry);
}
//----------------------------------------------------------------------------------------
// destructor
CParallelBeamStripKernelProjector2D::~CParallelBeamStripKernelProjector2D()
{
clear();
}
//---------------------------------------------------------------------------------------
// Clear - Constructors
void CParallelBeamStripKernelProjector2D::_clear()
{
CProjector2D::_clear();
m_bIsInitialized = false;
}
//---------------------------------------------------------------------------------------
// Clear - Public
void CParallelBeamStripKernelProjector2D::clear()
{
CProjector2D::clear();
m_bIsInitialized = false;
}
//---------------------------------------------------------------------------------------
// Check
bool CParallelBeamStripKernelProjector2D::_check()
{
// check base class
ASTRA_CONFIG_CHECK(CProjector2D::_check(), "ParallelBeamStripKernelProjector2D", "Error in Projector2D initialization");
ASTRA_CONFIG_CHECK(dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry) || dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry), "ParallelBeamStripKernelProjector2D", "Unsupported projection geometry");
ASTRA_CONFIG_CHECK(m_pVolumeGeometry->getPixelLengthX() == m_pVolumeGeometry->getPixelLengthY(), "ParallelBeamStripKernelProjector2D", "Pixel height must equal pixel width.");
// success
return true;
}
//---------------------------------------------------------------------------------------
// Initialize, use a Config object
bool CParallelBeamStripKernelProjector2D::initialize(const Config& _cfg)
{
ASTRA_ASSERT(_cfg.self);
// if already initialized, clear first
if (m_bIsInitialized) {
clear();
}
// initialization of parent class
if (!CProjector2D::initialize(_cfg)) {
return false;
}
// success
m_bIsInitialized = _check();
return m_bIsInitialized;
}
//---------------------------------------------------------------------------------------
// Initialize
bool CParallelBeamStripKernelProjector2D::initialize(CParallelProjectionGeometry2D* _pProjectionGeometry,
CVolumeGeometry2D* _pVolumeGeometry)
{
// if already initialized, clear first
if (m_bIsInitialized) {
clear();
}
// hardcopy geometries
m_pProjectionGeometry = _pProjectionGeometry->clone();
m_pVolumeGeometry = _pVolumeGeometry->clone();
// success
m_bIsInitialized = _check();
return m_bIsInitialized;
}
//----------------------------------------------------------------------------------------
// Get maximum amount of weights on a single ray
int CParallelBeamStripKernelProjector2D::getProjectionWeightsCount(int _iProjectionIndex)
{
int maxDim = max(m_pVolumeGeometry->getGridRowCount(), m_pVolumeGeometry->getGridColCount());
int scale = m_pProjectionGeometry->getDetectorWidth() / min(m_pVolumeGeometry->getPixelLengthX(), m_pVolumeGeometry->getPixelLengthY());
return maxDim * scale * 10 + 1;
}
//----------------------------------------------------------------------------------------
// Single Ray Weights
void CParallelBeamStripKernelProjector2D::computeSingleRayWeights(int _iProjectionIndex,
int _iDetectorIndex,
SPixelWeight* _pWeightedPixels,
int _iMaxPixelCount,
int& _iStoredPixelCount)
{
ASTRA_ASSERT(m_bIsInitialized);
StorePixelWeightsPolicy p(_pWeightedPixels, _iMaxPixelCount);
projectSingleRay(_iProjectionIndex, _iDetectorIndex, p);
_iStoredPixelCount = p.getStoredPixelCount();
}
//----------------------------------------------------------------------------------------
// Splat a single point
std::vector<SDetector2D> CParallelBeamStripKernelProjector2D::projectPoint(int _iRow, int _iCol)
{
// float32 xUL = m_pVolumeGeometry->pixelColToCenterX(_iCol) - m_pVolumeGeometry->getPixelLengthX() * 0.5f;
// float32 yUL = m_pVolumeGeometry->pixelRowToCenterY(_iRow) - m_pVolumeGeometry->getPixelLengthY() * 0.5f;
// float32 xUR = m_pVolumeGeometry->pixelColToCenterX(_iCol) + m_pVolumeGeometry->getPixelLengthX() * 0.5f;
// float32 yUR = m_pVolumeGeometry->pixelRowToCenterY(_iRow) - m_pVolumeGeometry->getPixelLengthY() * 0.5f;
// float32 xLL = m_pVolumeGeometry->pixelColToCenterX(_iCol) - m_pVolumeGeometry->getPixelLengthX() * 0.5f;
// float32 yLL = m_pVolumeGeometry->pixelRowToCenterY(_iRow) + m_pVolumeGeometry->getPixelLengthY() * 0.5f;
// float32 xLR = m_pVolumeGeometry->pixelColToCenterX(_iCol) + m_pVolumeGeometry->getPixelLengthX() * 0.5f;
// float32 yLR = m_pVolumeGeometry->pixelRowToCenterY(_iRow) + m_pVolumeGeometry->getPixelLengthY() * 0.5f;
std::vector<SDetector2D> res;
// // loop projectors and detectors
// for (int iProjection = 0; iProjection < m_pProjectionGeometry->getProjectionAngleCount(); ++iProjection) {
// // get projection angle
// float32 theta = m_pProjectionGeometry->getProjectionAngle(iProjection);
// if (theta >= 7*PIdiv4) theta -= 2*PI;
// bool inverse = false;
// if (theta >= 3*PIdiv4) {
// theta -= PI;
// inverse = true;
// }
// // calculate distance from the center of the voxel to the ray though the origin
// float32 tUL = xUL * cos(theta) + yUL * sin(theta);
// float32 tUR = xUR * cos(theta) + yUR * sin(theta);
// float32 tLL = xLL * cos(theta) + yLL * sin(theta);
// float32 tLR = xLR * cos(theta) + yLR * sin(theta);
// if (inverse) {
// tUL *= -1.0f;
// tUR *= -1.0f;
// tLL *= -1.0f;
// tLR *= -1.0f;
// }
// float32 tMin = min(tUL, min(tUR, min(tLL,tLR)));
// float32 tMax = max(tUL, max(tUR, max(tLL,tLR)));
// // calculate the offset on the detectorarray (in indices)
// int dmin = (int)floor(m_pProjectionGeometry->detectorOffsetToIndexFloat(tMin));
// int dmax = (int)ceil(m_pProjectionGeometry->detectorOffsetToIndexFloat(tMax));
// // add affected detectors to the list
// for (int i = dmin; i <= dmax; ++i) {
// if (i >= 0 && i < m_pProjectionGeometry->getDetectorCount()) {
// SDetector2D det;
// det.m_iAngleIndex = iProjection;
// det.m_iDetectorIndex = i;
// det.m_iIndex = iProjection * getProjectionGeometry()->getDetectorCount() + i;
// res.push_back(det);
// }
// }
// }
// return result vector
return res;
}
//----------------------------------------------------------------------------------------
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