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/*
-----------------------------------------------------------------------
Copyright: 2010-2015, iMinds-Vision Lab, University of Antwerp
2014-2015, CWI, Amsterdam
Contact: astra@uantwerpen.be
Website: http://sf.net/projects/astra-toolbox
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/>.
-----------------------------------------------------------------------
$Id$
*/
#ifndef _INC_ASTRA_ARTALGORITHM
#define _INC_ASTRA_ARTALGORITHM
#include "Globals.h"
#include "Config.h"
#include "Algorithm.h"
#include "ReconstructionAlgorithm2D.h"
#include "Projector2D.h"
#include "Float32ProjectionData2D.h"
#include "Float32VolumeData2D.h"
namespace astra {
/**
* This class contains the implementation of the ART (Algebraic Reconstruction Technique) algorithm.
*
* The update step of pixel \f$v_j\f$ for ray \f$i\f$ and iteration \f$k\f$ is given by:
* \f[
* v_j^{(k+1)} = v_j^{(k)} + \lambda \frac{p_i - \sum_{r=1}^{N} w_{ir}v_r^{(k)}}{\sum_{k=1}^{N} w_{ik}^2}
* \f]
*
* \par XML Configuration
* \astra_xml_item{ProjectorId, integer, Identifier of a projector as it is stored in the ProjectorManager.}
* \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. 1 = reconstruct on this pixel. 0 = don't reconstruct on this pixel.}
* \astra_xml_item_option{SinogramMaskId, integer, not used, Identifier of a projection data object that acts as a projection mask. 1 = reconstruct using this ray. 0 = don't use this ray while reconstructing.}
* \astra_xml_item_option{UseMinConstraint, bool, false, Use minimum value constraint.}
* \astra_xml_item_option{MinConstraintValue, float, 0, Minimum constraint value.}
* \astra_xml_item_option{UseMaxConstraint, bool, false, Use maximum value constraint.}
* \astra_xml_item_option{MaxConstraintValue, float, 255, Maximum constraint value.}
* \astra_xml_item_option{Relaxation, float, 1, The relaxation factor.}
* \astra_xml_item_option{RayOrder, string, "sequential", the order in which the rays are updated. 'sequential' or 'custom'}
* \astra_xml_item_option{RayOrderList, n by 2 vector of float, not used, if RayOrder='custom': use this ray order. Each row consist of a projection id and detector id.}
*
* \par MATLAB example
* \astra_code{
* cfg = astra_struct('ART');\n
* cfg.ProjectorId = proj_id;\n
* cfg.ProjectionDataId = sino_id;\n
* cfg.ReconstructionDataId = recon_id;\n
* cfg.option.MaskId = mask_id;\n
* cfg.option.UseMinConstraint = 'yes';\n
* cfg.option.UseMaxConstraint = 'yes';\n
* cfg.option.MaxConstraintValue = 1024;\n
* cfg.option.Relaxation = 0.7;\n
* cfg.option.RayOrder = 'custom';\n
* cfg.option.RayOrderList = [0\,0; 0\,2; 1\,0];\n
* alg_id = astra_mex_algorithm('create'\, cfg);\n
* astra_mex_algorithm('iterate'\, alg_id\, 1000);\n
* astra_mex_algorithm('delete'\, alg_id);\n
* }
*/
class _AstraExport CArtAlgorithm : public CReconstructionAlgorithm2D {
protected:
/** Initial clearing. Only to be used by constructors.
*/
virtual void _clear();
/** 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
* - the ray order list only contains valid values
*/
virtual bool _check();
public:
// type of the algorithm, needed to register with CAlgorithmFactory
static std::string type;
/** Default constructor, containing no code.
*/
CArtAlgorithm();
/** Destructor.
*/
virtual ~CArtAlgorithm();
/** Initialize the algorithm with a config object.
*
* @param _cfg Configuration Object
* @return initialization successful?
*/
virtual bool initialize(const Config& _cfg);
/** Initialize class, use sequential ray order.
*
* @param _pProjector Projector Object.
* @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);
/** Clear this class.
*/
virtual void clear();
/** Set the relaxation factor.
*
* @param _fLambda Relaxation factor
*/
void setLambda(float32 _fLambda);
/** Set the order in which the rays will be selected
*
* @param _piProjectionOrder Order of the rays, the projections. (size should be _piRayCount)
* @param _piDetectorOrder Order of the rays, the detectors. (size should be _piRayCount)
* @param _piRayCount Number of rays in the two previous arrays.
*/
void setRayOrder(int* _piProjectionOrder, int* _piDetectorOrder, int _piRayCount);
/** 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;
protected:
//< Relaxation Factor
float32 m_fLambda;
//< Order of the rays, the projections.
int* m_piProjectionOrder;
//< Order of the rays, the detectors.
int* m_piDetectorOrder;
//< Number of rays specified in the ray order arrays.
int m_iRayCount;
//< Current index in the ray order arrays.
int m_iCurrentRay;
};
// inline functions
inline std::string CArtAlgorithm::description() const { return CArtAlgorithm::type; };
} // end namespace
#endif
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