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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkDirectFourierReconstructionImageToImageFilter_h
#define itkDirectFourierReconstructionImageToImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkImage.h"
#include "itkVnlForwardFFTImageFilter.h"
#include "itkVnlInverseFFTImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkImageSliceConstIteratorWithIndex.h"
#include "itkComplexBSplineInterpolateImageFunction.h"
#include <cmath>
namespace itk
{
/**
* \class DirectFourierReconstructionImageToImageFilter
* \brief Direct fourier reconstruction filter of a tomographic volume.
*
* The algorithm is detailed in the Insight Journal publication on
* "Direct Fourier Tomographic Reconstruction Image-to-Image Filter"
* by D. Zosso, M. Bach Cuadra and J. Thiran, August 2007
*
* This implementation was taken from the Insight Journal paper:
* https://hdl.handle.net/1926/585
*
* \ingroup ImageFilters
* \ingroup ITKReview
*/
template< typename TInputImage, typename TOutputImage=TInputImage >
class DirectFourierReconstructionImageToImageFilter:
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/** Standard Self typedef */
typedef DirectFourierReconstructionImageToImageFilter Self;
typedef TInputImage InputImageType;
typedef typename InputImageType::PixelType InputPixelType;
typedef TOutputImage OutputImageType;
typedef typename OutputImageType::PixelType OutputPixelType;
/** Standard Superclass typedef */
typedef ImageToImageFilter< InputImageType, OutputImageType > Superclass;
/** Standard Pointer typedef */
typedef SmartPointer< Self > Pointer;
/** Standard ConstPointer typedef */
typedef SmartPointer< const Self > ConstPointer;
itkNewMacro(Self);
itkTypeMacro(DirectFourierReconstructionImageToImageFilter, ImageToImageFilter);
/** Class RegionType */
typedef typename InputImageType::RegionType RegionType;
/** Class IndexType */
typedef typename InputImageType::IndexType IndexType;
/** Class SizeType */
typedef typename InputImageType::SizeType SizeType;
/** Class PointType */
typedef typename InputImageType::PointType PointType;
/** Class SpacingType */
typedef typename InputImageType::SpacingType SpacingType;
/** Standard (const) InputImagePointer */
typedef typename InputImageType::ConstPointer ConstInputImagePointer;
/** Special (non-const) InputImagePointer */
typedef typename InputImageType::Pointer InputImagePointer;
/** OutputImagePointer */
typedef typename OutputImageType::Pointer OutputImagePointer;
itkSetMacro(ZeroPadding, unsigned short int);
itkGetConstMacro(ZeroPadding, unsigned short int);
itkSetMacro(OverSampling, unsigned short int);
itkGetConstMacro(OverSampling, unsigned short int);
itkSetMacro(Cutoff, double);
itkGetConstMacro(Cutoff, double);
itkSetMacro(AlphaRange, double);
itkGetConstMacro(AlphaRange, double);
itkSetMacro(AlphaDirection, unsigned short int);
itkGetConstMacro(AlphaDirection, unsigned short int);
itkSetMacro(ZDirection, unsigned short int);
itkGetConstMacro(ZDirection, unsigned short int);
itkSetMacro(RDirection, unsigned short int);
itkGetConstMacro(RDirection, unsigned short int);
itkSetMacro(RadialSplineOrder, unsigned short int);
itkGetConstMacro(RadialSplineOrder, unsigned short int);
protected:
/** Constructor */
DirectFourierReconstructionImageToImageFilter();
/** Destructor */
~DirectFourierReconstructionImageToImageFilter() {}
/** Output class information */
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** Generate metadata for output image */
void GenerateOutputInformation() ITK_OVERRIDE;
/** Calculate the required input region */
void GenerateInputRequestedRegion() ITK_OVERRIDE;
/** Actual filter computation */
void GenerateData() ITK_OVERRIDE;
private:
/** Const slice iterator type of the input image */
typedef ImageSliceConstIteratorWithIndex< InputImageType > InputSliceIteratorType;
/** 1D FFT filter type */
typedef Image< double, 1 > LineImageType;
typedef VnlForwardFFTImageFilter< LineImageType > FFTLineFilterType;
/** Derived 1D FFT image type */
typedef FFTLineFilterType::OutputImageType FFTLineType;
/** Derived 1D input image type */
typedef FFTLineFilterType::InputImageType ProjectionLineType;
/** 1D FFT line iterator */
typedef ImageRegionIteratorWithIndex< FFTLineType > FFTLineIteratorType;
/** 1D FFT line B-Spline interpolator */
typedef ComplexBSplineInterpolateImageFunction< FFTLineType, double, double > FFTLineInterpolatorType;
/** 2D inverse FFT filter type */
typedef Image< std::complex<double>, 2> IFFTImageType;
typedef VnlInverseFFTImageFilter< IFFTImageType > IFFTSliceFilterType;
/** Derived 2D FFT image type */
typedef IFFTSliceFilterType::InputImageType FFTSliceType;
/** Derived 2D output slice type */
typedef IFFTSliceFilterType::OutputImageType OutputSliceType;
/** 2D FFT slice iterator */
typedef ImageRegionIteratorWithIndex< FFTSliceType > FFTSliceIteratorType;
/** 2D output slice iterator */
typedef ImageRegionIteratorWithIndex< OutputSliceType > OutputSliceIteratorType;
unsigned short int m_ZeroPadding; /**< n-fold zero-padding */
unsigned short int m_OverSampling; /**< n-fold oversampling */
double m_Cutoff; /**< Radial lowpass cut-off frequency
*/
double m_AlphaRange; /**< Covered angular range */
unsigned short int m_ZDirection; /**< Axial index in the input image */
unsigned short int m_AlphaDirection; /**< Angular index in the input image
*/
unsigned short int m_RDirection; /**< Radial index in the input image
*/
unsigned short int m_RadialSplineOrder; /**< Spline order for the radial
BSpline interpolation */
double m_PI; /**< The constant pi.... */
RegionType m_InputRequestedRegion; /**< The region requested from* the input
image */
DirectFourierReconstructionImageToImageFilter(const Self &) ITK_DELETE_FUNCTION;
void operator=(const Self &) ITK_DELETE_FUNCTION;
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkDirectFourierReconstructionImageToImageFilter.hxx"
#endif
#endif /* itkDirectFourierReconstructionImageToImageFilter_h */
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