rtkFDKConeBeamReconstructionFilter.h

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/*=========================================================================
 *
 *  Copyright RTK 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
 *
 *         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 rtkFDKConeBeamReconstructionFilter_h
#define rtkFDKConeBeamReconstructionFilter_h

#include "rtkFDKWeightProjectionFilter.h"
#include "rtkFFTRampImageFilter.h"
#include "rtkFDKBackProjectionImageFilter.h"
#include "rtkConfiguration.h"

#include <itkExtractImageFilter.h>

namespace rtk
{

template <class TInputImage, class TOutputImage = TInputImage, class TFFTPrecision = double>
class ITK_TEMPLATE_EXPORT FDKConeBeamReconstructionFilter : public itk::InPlaceImageFilter<TInputImage, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(FDKConeBeamReconstructionFilter);

  using Self = FDKConeBeamReconstructionFilter;
  using Superclass = itk::ImageToImageFilter<TInputImage, TOutputImage>;
  using Pointer = itk::SmartPointer<Self>;
  using ConstPointer = itk::SmartPointer<const Self>;

  using InputImageType = TInputImage;
  using OutputImageType = TOutputImage;

  using ExtractFilterType = itk::ExtractImageFilter<InputImageType, OutputImageType>;
  using WeightFilterType = rtk::FDKWeightProjectionFilter<InputImageType, OutputImageType>;
  using RampFilterType = rtk::FFTRampImageFilter<OutputImageType, OutputImageType, TFFTPrecision>;
  using BackProjectionFilterType = rtk::FDKBackProjectionImageFilter<OutputImageType, OutputImageType>;
  using BackProjectionFilterPointer = typename BackProjectionFilterType::Pointer;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(FDKConeBeamReconstructionFilter);

  itkGetModifiableObjectMacro(Geometry, ThreeDCircularProjectionGeometry);
  itkSetObjectMacro(Geometry, ThreeDCircularProjectionGeometry);

  typename WeightFilterType::Pointer
  GetWeightFilter()
  {
    return m_WeightFilter;
  }

  typename RampFilterType::Pointer
  GetRampFilter()
  {
    return m_RampFilter;
  }

  itkGetMacro(ProjectionSubsetSize, unsigned int);
  itkSetMacro(ProjectionSubsetSize, unsigned int);

  itkGetMacro(BackProjectionFilter, BackProjectionFilterPointer);
  virtual void
  SetBackProjectionFilter(BackProjectionFilterType * _arg);

protected:
  FDKConeBeamReconstructionFilter();
  ~FDKConeBeamReconstructionFilter() override = default;

  void
  VerifyPreconditions() const override;

  void
  GenerateInputRequestedRegion() override;

  void
  GenerateOutputInformation() override;

  void
  GenerateData() override;

  void
  VerifyInputInformation() const override
  {}

  typename ExtractFilterType::Pointer m_ExtractFilter;
  typename WeightFilterType::Pointer  m_WeightFilter;
  typename RampFilterType::Pointer    m_RampFilter;
  BackProjectionFilterPointer         m_BackProjectionFilter;

private:
  unsigned int m_ProjectionSubsetSize{ 16 };

  ThreeDCircularProjectionGeometry::Pointer m_Geometry;
}; // end of class

} // end namespace rtk

#ifndef ITK_MANUAL_INSTANTIATION
#  include "rtkFDKConeBeamReconstructionFilter.hxx"
#endif

#endif