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+/*
+-----------------------------------------------------------------------
+Copyright 2012 iMinds-Vision Lab, University of Antwerp
+
+Contact: astra@ua.ac.be
+Website: http://astra.ua.ac.be
+
+
+This file is part of the
+All Scale Tomographic Reconstruction Antwerp Toolbox ("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/>.
+
+-----------------------------------------------------------------------
+$Id$
+*/
+
+#ifndef _INC_ASTRA_CUDASIRTALGORITHM3D
+#define _INC_ASTRA_CUDASIRTALGORITHM3D
+
+#include "Globals.h"
+#include "Config.h"
+
+#include "Algorithm.h"
+
+#include "Float32ProjectionData3DMemory.h"
+#include "Float32VolumeData3DMemory.h"
+#include "ReconstructionAlgorithm3D.h"
+
+#ifdef ASTRA_CUDA
+
+namespace astra {
+
+class AstraSIRT3d;
+
+/**
+ * \brief
+ * This class contains the 3D 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
+ *
+ * \par MATLAB example
+ * \astra_code{
+ *
+ * }
+ *
+ * \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 CCudaSirtAlgorithm3D : public CReconstructionAlgorithm3D {
+
+protected:
+
+ /** Check the values of this object. If everything is ok, the object can be set to the initialized state.
+ * The following statements are then guaranteed to hold:
+ * - no NULL pointers
+ * - all sub-objects are initialized properly
+ * - the projector is compatible with both data objects
+ */
+ virtual bool _check();
+
+public:
+
+ // type of the algorithm, needed to register with CAlgorithmFactory
+ static std::string type;
+
+ /** Default constructor, does not initialize the object.
+ */
+ CCudaSirtAlgorithm3D();
+
+ /** Constructor with initialization.
+ *
+ * @param _pProjector Projector Object.
+ * @param _pProjectionData ProjectionData3D object containing the projection data.
+ * @param _pReconstruction VolumeData3D object for storing the reconstructed volume.
+ */
+ CCudaSirtAlgorithm3D(CProjector3D* _pProjector,
+ CFloat32ProjectionData3DMemory* _pProjectionData,
+ CFloat32VolumeData3DMemory* _pReconstruction);
+
+ /** Copy constructor.
+ */
+ CCudaSirtAlgorithm3D(const CCudaSirtAlgorithm3D&);
+
+ /** Destructor.
+ */
+ virtual ~CCudaSirtAlgorithm3D();
+
+ /** Clear this class.
+ */
+/* virtual void clear();*/
+
+ /** 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.
+ * @param _pProjectionData ProjectionData3D object containing the projection data.
+ * @param _pReconstruction VolumeData3D object for storing the reconstructed volume.
+ * @return initialization successful?
+ */
+ bool initialize(CProjector3D* _pProjector,
+ CFloat32ProjectionData3DMemory* _pSinogram,
+ CFloat32VolumeData3DMemory* _pReconstruction);
+
+ /** Get all information parameters
+ *
+ * @return map with all boost::any object
+ */
+ virtual map<string,boost::any> getInformation();
+
+ /** Get a single piece of information represented as a boost::any
+ *
+ * @param _sIdentifier identifier string to specify which piece of information you want
+ * @return boost::any object
+ */
+ virtual boost::any getInformation(std::string _sIdentifier);
+
+ /** Perform a number of iterations.
+ *
+ * @param _iNrIterations amount of iterations to perform.
+ */
+ virtual void run(int _iNrIterations = 0);
+
+ /** Get a description of the class.
+ *
+ * @return description string
+ */
+ virtual std::string description() const;
+
+ /**
+ * Sets the index of the used GPU index: first GPU has index 0
+ *
+ * @param _iGPUIndex New GPU index.
+ */
+ void setGPUIndex(int _iGPUIndex);
+
+
+ virtual void signalAbort();
+
+ /** Get the norm of the residual image.
+ * Only a few algorithms support this method.
+ *
+ * @param _fNorm if supported, the norm is returned here
+ * @return true if this operation is supported
+ */
+ virtual bool getResidualNorm(float32& _fNorm);
+
+protected:
+
+ AstraSIRT3d* m_pSirt;
+
+ int m_iGPUIndex;
+ bool m_bAstraSIRTInit;
+ int m_iDetectorSuperSampling;
+ int m_iVoxelSuperSampling;
+};
+
+// inline functions
+inline std::string CCudaSirtAlgorithm3D::description() const { return CCudaSirtAlgorithm3D::type; };
+
+} // end namespace
+
+#endif
+
+#endif