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/*
-----------------------------------------------------------------------
Copyright: 2010-2018, iMinds-Vision Lab, University of Antwerp
2014-2018, 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/ParallelBeamLinearKernelProjector2D.h"
#include <cmath>
#include <algorithm>
#include "astra/DataProjectorPolicies.h"
using namespace std;
using namespace astra;
#include "astra/ParallelBeamLinearKernelProjector2D.inl"
// type of the projector, needed to register with CProjectorFactory
std::string CParallelBeamLinearKernelProjector2D::type = "linear";
//----------------------------------------------------------------------------------------
// default constructor
CParallelBeamLinearKernelProjector2D::CParallelBeamLinearKernelProjector2D()
{
_clear();
}
//----------------------------------------------------------------------------------------
// constructor
CParallelBeamLinearKernelProjector2D::CParallelBeamLinearKernelProjector2D(CParallelProjectionGeometry2D* _pProjectionGeometry,
CVolumeGeometry2D* _pReconstructionGeometry)
{
_clear();
initialize(_pProjectionGeometry, _pReconstructionGeometry);
}
//----------------------------------------------------------------------------------------
// destructor
CParallelBeamLinearKernelProjector2D::~CParallelBeamLinearKernelProjector2D()
{
clear();
}
//---------------------------------------------------------------------------------------
// Clear - CParallelBeamLinearKernelProjector2D
void CParallelBeamLinearKernelProjector2D::_clear()
{
CProjector2D::_clear();
m_bIsInitialized = false;
}
//---------------------------------------------------------------------------------------
// Clear - Public
void CParallelBeamLinearKernelProjector2D::clear()
{
CProjector2D::clear();
m_bIsInitialized = false;
}
//---------------------------------------------------------------------------------------
// Check
bool CParallelBeamLinearKernelProjector2D::_check()
{
// check base class
ASTRA_CONFIG_CHECK(CProjector2D::_check(), "ParallelBeamLinearKernelProjector2D", "Error in Projector2D initialization");
ASTRA_CONFIG_CHECK(dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry) || dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry), "ParallelBeamLinearKernelProjector2D", "Unsupported projection geometry");
/// TODO: ADD PIXEL H/W LIMITATIONS
ASTRA_CONFIG_CHECK(abs(m_pVolumeGeometry->getPixelLengthX() / m_pVolumeGeometry->getPixelLengthY()) - 1 < eps, "ParallelBeamLinearKernelProjector2D", "Pixel height must equal pixel width.");
// success
return true;
}
//---------------------------------------------------------------------------------------
// Initialize, use a Config object
bool CParallelBeamLinearKernelProjector2D::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 CParallelBeamLinearKernelProjector2D::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 CParallelBeamLinearKernelProjector2D::getProjectionWeightsCount(int _iProjectionIndex)
{
int maxDim = max(m_pVolumeGeometry->getGridRowCount(), m_pVolumeGeometry->getGridColCount());
return maxDim * 2 + 1;
}
//----------------------------------------------------------------------------------------
// Single Ray Weights
void CParallelBeamLinearKernelProjector2D::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> CParallelBeamLinearKernelProjector2D::projectPoint(int _iRow, int _iCol)
{
float32 xUL = m_pVolumeGeometry->pixelColToCenterX(_iCol) - m_pVolumeGeometry->getPixelLengthX() * 1.5f;
float32 yUL = m_pVolumeGeometry->pixelRowToCenterY(_iRow) - m_pVolumeGeometry->getPixelLengthY() * 1.5f;
float32 xUR = m_pVolumeGeometry->pixelColToCenterX(_iCol) + m_pVolumeGeometry->getPixelLengthX() * 1.5f;
float32 yUR = m_pVolumeGeometry->pixelRowToCenterY(_iRow) - m_pVolumeGeometry->getPixelLengthY() * 1.5f;
float32 xLL = m_pVolumeGeometry->pixelColToCenterX(_iCol) - m_pVolumeGeometry->getPixelLengthX() * 1.5f;
float32 yLL = m_pVolumeGeometry->pixelRowToCenterY(_iRow) + m_pVolumeGeometry->getPixelLengthY() * 1.5f;
float32 xLR = m_pVolumeGeometry->pixelColToCenterX(_iCol) + m_pVolumeGeometry->getPixelLengthX() * 1.5f;
float32 yLR = m_pVolumeGeometry->pixelRowToCenterY(_iRow) + m_pVolumeGeometry->getPixelLengthY() * 1.5f;
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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