rtkADMMTotalVariationConjugateGradientOperator.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
 *
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 *  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.
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 *=========================================================================*/

#ifndef rtkADMMTotalVariationConjugateGradientOperator_h
#define rtkADMMTotalVariationConjugateGradientOperator_h

#include <itkMultiplyImageFilter.h>
#include <itkSubtractImageFilter.h>

#include "rtkConjugateGradientOperator.h"
#include "rtkBackProjectionImageFilter.h"
#include "rtkForwardProjectionImageFilter.h"
#include "rtkForwardDifferenceGradientImageFilter.h"
#include "rtkBackwardDifferenceDivergenceImageFilter.h"
#include "rtkDisplacedDetectorImageFilter.h"
#include "rtkMultiplyByVectorImageFilter.h"
#include "rtkThreeDCircularProjectionGeometry.h"

#ifdef RTK_USE_CUDA
#  include <itkCudaImage.h>
#endif

namespace rtk
{

template <typename TOutputImage>
class ITK_TEMPLATE_EXPORT ADMMTotalVariationConjugateGradientOperator : public ConjugateGradientOperator<TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(ADMMTotalVariationConjugateGradientOperator);

  using Self = ADMMTotalVariationConjugateGradientOperator;
  using Superclass = ConjugateGradientOperator<TOutputImage>;
  using Pointer = itk::SmartPointer<Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(ADMMTotalVariationConjugateGradientOperator);

  using BackProjectionFilterType = rtk::BackProjectionImageFilter<TOutputImage, TOutputImage>;
  using BackProjectionFilterPointer = typename BackProjectionFilterType::Pointer;

  using ForwardProjectionFilterType = rtk::ForwardProjectionImageFilter<TOutputImage, TOutputImage>;
  using ForwardProjectionFilterPointer = typename ForwardProjectionFilterType::Pointer;

  using MultiplyFilterType = itk::MultiplyImageFilter<TOutputImage>;
  using SubtractFilterType = itk::SubtractImageFilter<TOutputImage>;

  using VectorPixelType = itk::CovariantVector<typename TOutputImage::ValueType, TOutputImage::ImageDimension>;
  using CPUImageType = itk::Image<typename TOutputImage::PixelType, TOutputImage::ImageDimension>;
#ifdef RTK_USE_CUDA
  typedef
    typename std::conditional<std::is_same<TOutputImage, CPUImageType>::value,
                              itk::Image<VectorPixelType, TOutputImage::ImageDimension>,
                              itk::CudaImage<VectorPixelType, TOutputImage::ImageDimension>>::type GradientImageType;
#else
  using GradientImageType = itk::Image<VectorPixelType, TOutputImage::ImageDimension>;
#endif

  using GradientFilterType = ForwardDifferenceGradientImageFilter<TOutputImage,
                                                                  typename TOutputImage::ValueType,
                                                                  typename TOutputImage::ValueType,
                                                                  GradientImageType>;
  using DivergenceFilterType = rtk::BackwardDifferenceDivergenceImageFilter<GradientImageType, TOutputImage>;
  using DisplacedDetectorFilterType = rtk::DisplacedDetectorImageFilter<TOutputImage>;
  using GatingWeightsFilterType = rtk::MultiplyByVectorImageFilter<TOutputImage>;

  void
  SetBackProjectionFilter(BackProjectionFilterType * _arg);

  void
  SetForwardProjectionFilter(ForwardProjectionFilterType * _arg);

  itkSetObjectMacro(Geometry, ThreeDCircularProjectionGeometry);

  itkSetMacro(Beta, float);

  void
  SetGatingWeights(std::vector<float> weights);

  itkSetMacro(DisableDisplacedDetectorFilter, bool);
  itkGetMacro(DisableDisplacedDetectorFilter, bool);

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

  void
  VerifyPreconditions() const override;

  void
  GenerateData() override;

  BackProjectionFilterPointer    m_BackProjectionFilter;
  ForwardProjectionFilterPointer m_ForwardProjectionFilter;

  typename SubtractFilterType::Pointer          m_SubtractFilter;
  typename MultiplyFilterType::Pointer          m_MultiplyFilter;
  typename MultiplyFilterType::Pointer          m_ZeroMultiplyProjectionFilter;
  typename MultiplyFilterType::Pointer          m_ZeroMultiplyVolumeFilter;
  typename DivergenceFilterType::Pointer        m_DivergenceFilter;
  typename GradientFilterType::Pointer          m_GradientFilter;
  typename DisplacedDetectorFilterType::Pointer m_DisplacedDetectorFilter;
  typename GatingWeightsFilterType::Pointer     m_GatingWeightsFilter;

  ThreeDCircularProjectionGeometry::Pointer m_Geometry;
  float                                     m_Beta;
  bool                                      m_DisableDisplacedDetectorFilter;

  bool               m_IsGated;
  std::vector<float> m_GatingWeights;

  void
  VerifyInputInformation() const override
  {}

  void
  GenerateInputRequestedRegion() override;
  void
  GenerateOutputInformation() override;
};
} // namespace rtk


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

#endif