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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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://www.insight-journal.org/browse/publication/177
*
* \ingroup ImageFilters
* \ingroup ITKReview
*/
template <typename TInputImage, typename TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT DirectFourierReconstructionImageToImageFilter
: public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(DirectFourierReconstructionImageToImageFilter);
/** Standard Self type alias */
using Self = DirectFourierReconstructionImageToImageFilter;
using InputImageType = TInputImage;
using InputPixelType = typename InputImageType::PixelType;
using OutputImageType = TOutputImage;
using OutputPixelType = typename OutputImageType::PixelType;
/** Standard Superclass type alias */
using Superclass = ImageToImageFilter<InputImageType, OutputImageType>;
/** Standard Pointer type alias */
using Pointer = SmartPointer<Self>;
/** Standard ConstPointer type alias */
using ConstPointer = SmartPointer<const Self>;
itkNewMacro(Self);
itkOverrideGetNameOfClassMacro(DirectFourierReconstructionImageToImageFilter);
/** Class RegionType */
using RegionType = typename InputImageType::RegionType;
/** Class IndexType */
using IndexType = typename InputImageType::IndexType;
/** Class SizeType */
using SizeType = typename InputImageType::SizeType;
/** Class PointType */
using PointType = typename InputImageType::PointType;
/** Class SpacingType */
using SpacingType = typename InputImageType::SpacingType;
/** Standard (const) InputImagePointer */
using ConstInputImagePointer = typename InputImageType::ConstPointer;
/** Special (non-const) InputImagePointer */
using InputImagePointer = typename InputImageType::Pointer;
/** OutputImagePointer */
using OutputImagePointer = typename OutputImageType::Pointer;
itkSetMacro(ZeroPadding, unsigned short);
itkGetConstMacro(ZeroPadding, unsigned short);
itkSetMacro(OverSampling, unsigned short);
itkGetConstMacro(OverSampling, unsigned short);
itkSetMacro(Cutoff, double);
itkGetConstMacro(Cutoff, double);
itkSetMacro(AlphaRange, double);
itkGetConstMacro(AlphaRange, double);
itkSetMacro(AlphaDirection, unsigned short);
itkGetConstMacro(AlphaDirection, unsigned short);
itkSetMacro(ZDirection, unsigned short);
itkGetConstMacro(ZDirection, unsigned short);
itkSetMacro(RDirection, unsigned short);
itkGetConstMacro(RDirection, unsigned short);
itkSetMacro(RadialSplineOrder, unsigned short);
itkGetConstMacro(RadialSplineOrder, unsigned short);
protected:
/** Constructor */
DirectFourierReconstructionImageToImageFilter();
/** Destructor */
~DirectFourierReconstructionImageToImageFilter() override = default;
/** Output class information */
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** Generate metadata for output image */
void
GenerateOutputInformation() override;
/** Calculate the required input region */
void
GenerateInputRequestedRegion() override;
/** Actual filter computation */
void
GenerateData() override;
private:
/** Const slice iterator type of the input image */
using InputSliceIteratorType = ImageSliceConstIteratorWithIndex<InputImageType>;
/** 1D FFT filter type */
using LineImageType = Image<double, 1>;
using FFTLineFilterType = VnlForwardFFTImageFilter<LineImageType>;
/** Derived 1D FFT image type */
using FFTLineType = FFTLineFilterType::OutputImageType;
/** Derived 1D input image type */
using ProjectionLineType = FFTLineFilterType::InputImageType;
/** 1D FFT line iterator */
using FFTLineIteratorType = ImageRegionIteratorWithIndex<FFTLineType>;
/** 1D FFT line B-Spline interpolator */
using FFTLineInterpolatorType = ComplexBSplineInterpolateImageFunction<FFTLineType, double, double>;
/** 2D inverse FFT filter type */
using IFFTImageType = Image<std::complex<double>, 2>;
using IFFTSliceFilterType = VnlInverseFFTImageFilter<IFFTImageType>;
/** Derived 2D FFT image type */
using FFTSliceType = IFFTSliceFilterType::InputImageType;
/** Derived 2D output slice type */
using OutputSliceType = IFFTSliceFilterType::OutputImageType;
/** 2D FFT slice iterator */
using FFTSliceIteratorType = ImageRegionIteratorWithIndex<FFTSliceType>;
/** 2D output slice iterator */
using OutputSliceIteratorType = ImageRegionIteratorWithIndex<OutputSliceType>;
unsigned short m_ZeroPadding{}; /**< n-fold zero-padding */
unsigned short m_OverSampling{}; /**< n-fold oversampling */
double m_Cutoff{}; /**< Radial lowpass cut-off frequency
*/
double m_AlphaRange{}; /**< Covered angular range */
unsigned short m_ZDirection{}; /**< Axial index in the input image */
unsigned short m_AlphaDirection{}; /**< Angular index in the input image
*/
unsigned short m_RDirection{}; /**< Radial index in the input image
*/
unsigned short 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 */
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkDirectFourierReconstructionImageToImageFilter.hxx"
#endif
#endif /* itkDirectFourierReconstructionImageToImageFilter_h */
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