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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/>.
-----------------------------------------------------------------------
*/
#ifndef _INC_ASTRA_CUDASIRTALGORITHM2
#define _INC_ASTRA_CUDASIRTALGORITHM2
#include "Globals.h"
#include "Config.h"
#include "CudaReconstructionAlgorithm2D.h"
#ifdef ASTRA_CUDA
namespace astra {
/**
* \brief
* This class contains a GPU implementation of the SIRT (Simultaneous Iterative Reconstruction Technique) algorithm.
*
* The update step of pixel \f$v_j\f$ for iteration \f$k\f$ is given by:
* \f[
* v_j^{(k+1)} = v_j^{(k)} + \alpha \sum_{i=1}^{M} \left( \frac{w_{ij}\left( p_i - \sum_{r=1}^{N} w_{ir}v_r^{(k)}\right)}{\sum_{k=1}^{N} w_{ik}} \right) \frac{1}{\sum_{l=1}^{M}w_{lj}}
* \f]
*
* \par XML Configuration
* \astra_xml_item{ProjectionGeometry, integer, Geometry of the projection data.}
* \astra_xml_item{VolumeGeometry, integer, Geometry of the volume data.}
* \astra_xml_item{ProjectionDataId, integer, Identifier of a projection data object as it is stored in the DataManager.}
* \astra_xml_item{ReconstructionDataId, integer, Identifier of a volume data object as it is stored in the DataManager.}
* \astra_xml_item_option{ReconstructionMaskId, integer, not used, Identifier of a volume data object that acts as a reconstruction mask. 0 = reconstruct on this pixel. 1 = don't reconstruct on this pixel.}
* \astra_xml_item_option{Relaxation, float, 1, Relaxation parameter.}
*
* \par MATLAB example
* \astra_code{
* cfg = astra_struct('SIRT_CUDA2');\n
* cfg.ProjectionGeometry = proj_geom;\n
* cfg.VolumeGeometry = vol_geom;\n
* cfg.ProjectionDataId = sino_id;\n
* cfg.ReconstructionDataId = recon_id;\n
* cfg.option.ReconstructionMaskId = mask_id;\n
* cfg.option.Relaxation = 1.0;\n
* alg_id = astra_mex_algorithm('create'\, cfg);\n
* astra_mex_algorithm('iterate'\, alg_id\, 10);\n
* astra_mex_algorithm('delete'\, alg_id);\n
* }
*
* \par References
* [1] "Computational Analysis and Improvement of SIRT", J. Gregor, T. Benson, IEEE Transactions on Medical Imaging, Vol. 22, No. 7, July 2008.
*/
class _AstraExport CCudaSirtAlgorithm : public CCudaReconstructionAlgorithm2D
{
public:
// type of the algorithm, needed to register with CAlgorithmFactory
static std::string type;
/** Default constructor, containing no code.
*/
CCudaSirtAlgorithm();
/** Destructor.
*/
virtual ~CCudaSirtAlgorithm();
/** Initialize the algorithm with a config object.
*
* @param _cfg Configuration Object
* @return initialization successful?
*/
virtual bool initialize(const Config& _cfg);
/** Initialize class.
*
* @param _pProjector Projector Object. (Optional)
* @param _pSinogram ProjectionData2D object containing the sinogram data.
* @param _pReconstruction VolumeData2D object for storing the reconstructed volume.
*/
bool initialize(CProjector2D* _pProjector,
CFloat32ProjectionData2D* _pSinogram,
CFloat32VolumeData2D* _pReconstruction);
/** Get a description of the class.
*
* @return description string
*/
virtual std::string description() const;
protected:
CFloat32VolumeData2D* m_pMinMask;
CFloat32VolumeData2D* m_pMaxMask;
/** Relaxation factor
*/
float m_fLambda;
virtual void initCUDAAlgorithm();
};
// inline functions
inline std::string CCudaSirtAlgorithm::description() const { return CCudaSirtAlgorithm::type; };
} // end namespace
#endif // ASTRA_CUDA
#endif
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