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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_PARALLELBEAMBLOBPROJECTOR
#define _INC_ASTRA_PARALLELBEAMBLOBPROJECTOR
#include "ParallelProjectionGeometry2D.h"
#include "Float32Data2D.h"
#include "Projector2D.h"
namespace astra
{
/** This class implements a two-dimensional projector based on a blob-kernel.
* A more detailed description (in dutch) is available at
* http://www.astra.ua.ac.be/wiki/images/6/6e/Uitleg_blob_projector.pdf
*
* \par XML Configuration
* type = "blob"
* \astra_xml_item{ProjectionGeometry, xml node, The geometry of the projection.}
* \astra_xml_item{VolumeGeometry, xml node, The geometry of the volume.}
* \astra_xml_item{Kernel, xml node, Kernel details. See below.}
*
* \par XML Configuration of the Kernel
* \astra_xml_item{KernelSize, float, Radius of the kernel.}
* \astra_xml_item{SampleRate, float, Sample rate of the kernel.}
* \astra_xml_item{SampleCount, integer, Number of samples.}
* \astra_xml_item{KernelValues, vector of float, Samples of the kernels starting at distance 0.}
*
* \par MATLAB example
* \astra_code{
* cfg = astra_struct('blob');\n
* cfg.ProjectionGeometry = proj_geom;\n
* cfg.VolumeGeometry = vol_geom;\n
* cfg.Kernel.KernelSize = 2;\n
* cfg.Kernel.SampleRate = 0.01;\n
* cfg.Kernel.SampleCount = length(0:0.01:2);\n
* cfg.Kernel.KernelValues = kaiserBessel(2\, 10.4\, 2\, 0:0.01:2);\n
* proj_id = astra_mex_projector('create'\, cfg);\n
* }
*/
class _AstraExport CParallelBeamBlobKernelProjector2D : public CProjector2D {
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
* - blobvalues are ok
*/
virtual bool _check();
public:
// type of the projector, needed to register with CProjectorFactory
static std::string type;
/** Default constructor.
*/
CParallelBeamBlobKernelProjector2D();
/** Constructor.
*
* @param _pProjectionGeometry Information class about the geometry of the projection. Will be HARDCOPIED.
* @param _pReconstructionGeometry Information class about the geometry of the reconstruction volume. Will be HARDCOPIED.
* @param _fBlobSize Width of the blob. In units of PixelSize.
* @param _fBlobSampleRate Spacing between two blob samples. (= _fBlobSize/_iBlobSampleCount)
* @param _iBlobSampleCount Number of samples.
* @param _pfBlobValues Array of _iBlobSampleCount blob evaluations.
*/
CParallelBeamBlobKernelProjector2D(CParallelProjectionGeometry2D* _pProjectionGeometry,
CVolumeGeometry2D* _pReconstructionGeometry,
float32 _fBlobSize,
float32 _fBlobSampleRate,
int _iBlobSampleCount,
float32* _pfBlobValues);
/** Destructor, is virtual to show that we are aware subclass destructor are called.
*/
~CParallelBeamBlobKernelProjector2D();
/** Initialize the projector with a config object.
*
* @param _cfg Configuration Object
* @return initialization successful?
*/
virtual bool initialize(const Config& _cfg);
/** Initialize the projector.
*
* @param _pProjectionGeometry Information class about the geometry of the projection. Will be HARDCOPIED.
* @param _pReconstructionGeometry Information class about the geometry of the reconstruction volume. Will be HARDCOPIED.
* @param _fBlobSize Width of the blob. In units of PixelSize.
* @param _fBlobSampleRate Spacing between two blob samples. (= _fBlobSize/_iBlobSampleCount)
* @param _iBlobSampleCount Number of samples.
* @param _pfBlobValues Array of _iBlobSampleCount blob evaluations. Will be HARDCOPIED.
*/
bool initialize(CParallelProjectionGeometry2D* _pProjectionGeometry,
CVolumeGeometry2D* _pReconstructionGeometry,
float32 _fBlobSize,
float32 _fBlobSampleRate,
int _iBlobSampleCount,
float32* _pfBlobValues);
/** Clear this class.
*/
virtual void clear();
/** Returns the number of weights required for storage of all weights of one projection.
*
* @param _iProjectionIndex Index of the projection (zero-based).
* @return Size of buffer (given in SPixelWeight elements) needed to store weighted pixels.
*/
virtual int getProjectionWeightsCount(int _iProjectionIndex);
/** Compute the pixel weights for a single ray, from the source to a detector pixel.
*
* @param _iProjectionIndex Index of the projection
* @param _iDetectorIndex Index of the detector pixel
* @param _pWeightedPixels Pointer to a pre-allocated array, consisting of _iMaxPixelCount elements
* of type SPixelWeight. On return, this array contains a list of the index
* and weight for all pixels on the ray.
* @param _iMaxPixelCount Maximum number of pixels (and corresponding weights) that can be stored in _pWeightedPixels.
* This number MUST be greater than the total number of pixels on the ray.
* @param _iStoredPixelCount On return, this variable contains the total number of pixels on the
* ray (that have been stored in the list _pWeightedPixels).
*/
virtual void computeSingleRayWeights(int _iProjectionIndex,
int _iDetectorIndex,
SPixelWeight* _pWeightedPixels,
int _iMaxPixelCount,
int& _iStoredPixelCount);
/** Policy-based projection of all rays. This function will calculate each non-zero projection
* weight and use this value for a task provided by the policy object.
*
* @param _policy Policy object. Should contain prior, addWeight and posterior function.
*/
template <typename Policy>
void project(Policy& _policy);
/** Policy-based projection of all rays of a single projection. This function will calculate
* each non-zero projection weight and use this value for a task provided by the policy object.
*
* @param _iProjection Wwhich projection should be projected?
* @param _policy Policy object. Should contain prior, addWeight and posterior function.
*/
template <typename Policy>
void projectSingleProjection(int _iProjection, Policy& _policy);
/** Policy-based projection of a single ray. This function will calculate each non-zero
* projection weight and use this value for a task provided by the policy object.
*
* @param _iProjection Which projection should be projected?
* @param _iDetector Which detector should be projected?
* @param _policy Policy object. Should contain prior, addWeight and posterior function.
*/
template <typename Policy>
void projectSingleRay(int _iProjection, int _iDetector, Policy& _policy);
/** Return the type of this projector.
*
* @return identification type of this projector
*/
virtual std::string getType();
protected:
/** Evaluate the blob kernel for a given distance from its center.
*
* @param _fDiff distance between hit point and blob center
* @return blob value
*/
float32 _getBlobValue(float32 _fDiff);
float32 m_fBlobSize; //< Width of the blob
float32 m_fBlobSampleRate; //< At which interval are the inserted blob values evaluated?
int m_iBlobSampleCount; //< Number of evaluated blob samples
float32* m_pfBlobValues; //< Evaluated blob values
/** Internal policy-based projection of a range of angles and range.
* (_i*From is inclusive, _i*To exclusive) */
template <typename Policy>
void projectBlock_internal(int _iProjFrom, int _iProjTo,
int _iDetFrom, int _iDetTo, Policy& _policy);
};
//----------------------------------------------------------------------------------------
inline std::string CParallelBeamBlobKernelProjector2D::getType()
{
return type;
}
} // namespace astra
#endif
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