itkDirectFourierReconstructionImageToImageFilter.h

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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
{
template <typename TInputImage, typename TOutputImage = TInputImage>
class ITK_TEMPLATE_EXPORT DirectFourierReconstructionImageToImageFilter
  : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(DirectFourierReconstructionImageToImageFilter);

  using Self = DirectFourierReconstructionImageToImageFilter;
 
  using InputImageType = TInputImage;
  using InputPixelType = typename InputImageType::PixelType;
  using OutputImageType = TOutputImage;
  using OutputPixelType = typename OutputImageType::PixelType;

  using Superclass = ImageToImageFilter<InputImageType, OutputImageType>;

  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  itkNewMacro(Self);
  itkOverrideGetNameOfClassMacro(DirectFourierReconstructionImageToImageFilter);

  using RegionType = typename InputImageType::RegionType;
  using IndexType = typename InputImageType::IndexType;
  using SizeType = typename InputImageType::SizeType;
  using PointType = typename InputImageType::PointType;
  using SpacingType = typename InputImageType::SpacingType;

  using ConstInputImagePointer = typename InputImageType::ConstPointer;
  using InputImagePointer = typename InputImageType::Pointer;
  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:
  DirectFourierReconstructionImageToImageFilter();
  ~DirectFourierReconstructionImageToImageFilter() override = default;

  void
  PrintSelf(std::ostream & os, Indent indent) const override;

  void
  GenerateOutputInformation() override;

  void
  GenerateInputRequestedRegion() override;

  void
  GenerateData() override;
 
private:
  using InputSliceIteratorType = ImageSliceConstIteratorWithIndex<InputImageType>;

  using LineImageType = Image<double, 1>;
  using FFTLineFilterType = VnlForwardFFTImageFilter<LineImageType>;
  using FFTLineType = FFTLineFilterType::OutputImageType;
  using ProjectionLineType = FFTLineFilterType::InputImageType;
  using FFTLineIteratorType = ImageRegionIteratorWithIndex<FFTLineType>;
  using FFTLineInterpolatorType = ComplexBSplineInterpolateImageFunction<FFTLineType, double, double>;

  using IFFTImageType = Image<std::complex<double>, 2>;
  using IFFTSliceFilterType = VnlInverseFFTImageFilter<IFFTImageType>;
  using FFTSliceType = IFFTSliceFilterType::InputImageType;
  using OutputSliceType = IFFTSliceFilterType::OutputImageType;
  using FFTSliceIteratorType = ImageRegionIteratorWithIndex<FFTSliceType>;
  using OutputSliceIteratorType = ImageRegionIteratorWithIndex<OutputSliceType>;
 
  unsigned short m_ZeroPadding{};  
  unsigned short m_OverSampling{}; 
 
  double m_Cutoff{};     
  double m_AlphaRange{}; 
 
  unsigned short m_ZDirection{};        
  unsigned short m_AlphaDirection{};    
  unsigned short m_RDirection{};        
  unsigned short m_RadialSplineOrder{}; 
 
  double m_PI{}; 
 
  RegionType m_InputRequestedRegion{}; 
};
} // namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkDirectFourierReconstructionImageToImageFilter.hxx"
#endif
 
#endif /* itkDirectFourierReconstructionImageToImageFilter_h */