itkJointHistogramMutualInformationImageToImageMetricv4.h

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 *  Copyright Insight Software Consortium
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 *  you may not use this file except in compliance with the License.
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#ifndef itkJointHistogramMutualInformationImageToImageMetricv4_h
#define itkJointHistogramMutualInformationImageToImageMetricv4_h

#include "itkImageToImageMetricv4.h"
#include "itkImage.h"
#include "itkBSplineDerivativeKernelFunction.h"

#include "itkJointHistogramMutualInformationComputeJointPDFThreader.h"
#include "itkJointHistogramMutualInformationGetValueAndDerivativeThreader.h"

namespace itk
{
template<typename TFixedImage,typename TMovingImage,typename TVirtualImage = TFixedImage,
          typename TInternalComputationValueType = double,
          typename TMetricTraits = DefaultImageToImageMetricTraitsv4<TFixedImage,TMovingImage,TVirtualImage,TInternalComputationValueType>
          >
class ITK_TEMPLATE_EXPORT JointHistogramMutualInformationImageToImageMetricv4 :
  public ImageToImageMetricv4<TFixedImage, TMovingImage, TVirtualImage, TInternalComputationValueType, TMetricTraits>
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(JointHistogramMutualInformationImageToImageMetricv4);

  using Self = JointHistogramMutualInformationImageToImageMetricv4;
  using Superclass = ImageToImageMetricv4<TFixedImage, TMovingImage, TVirtualImage,
                             TInternalComputationValueType,TMetricTraits>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkTypeMacro(JointHistogramMutualInformationImageToImageMetricv4, ImageToImageMetricv4);

  using CoordinateRepresentationType = typename Superclass::CoordinateRepresentationType;

  using InternalComputationValueType = TInternalComputationValueType;

  using ParametersType = typename Superclass::ParametersType;
  using ParametersValueType = typename Superclass::ParametersValueType;
  using NumberOfParametersType = typename Superclass::NumberOfParametersType;

  using MeasureType = typename Superclass::MeasureType;
  using DerivativeType = typename Superclass::DerivativeType;
  using FixedImagePointType = typename Superclass::FixedImagePointType;
  using FixedImagePixelType = typename Superclass::FixedImagePixelType;
  using FixedImageGradientType = typename Superclass::FixedGradientPixelType;
  using MovingImagePointType = typename Superclass::MovingImagePointType;
  using MovingImagePixelType = typename Superclass::MovingImagePixelType;
  using MovingImageGradientType = typename Superclass::MovingGradientPixelType;

  using FixedTransformJacobianType = typename Superclass::FixedTransformType::JacobianType;
  using MovingTransformJacobianType = typename Superclass::MovingTransformType::JacobianType;

  using VirtualImageType = typename Superclass::VirtualImageType;
  using VirtualIndexType = typename Superclass::VirtualIndexType;
  using VirtualPointType = typename Superclass::VirtualPointType;
  using VirtualPointSetType = typename Superclass::VirtualPointSetType;

  /* Image dimension accessors */
  static constexpr typename TVirtualImage::ImageDimensionType VirtualImageDimension = TVirtualImage::ImageDimension;
  static constexpr typename TMovingImage::ImageDimensionType MovingImageDimension = TMovingImage::ImageDimension;

  using PDFValueType = TInternalComputationValueType;

  using MarginalPDFType = Image<PDFValueType,1>;
  using MarginalPDFIndexType = typename MarginalPDFType::IndexType;
  using MarginalPDFPointType = typename MarginalPDFType::PointType;
  using JointPDFType = Image< PDFValueType, 2>;
  using JointPDFIndexType = typename JointPDFType::IndexType;
  using JointPDFPointType = typename JointPDFType::PointType;
  using JointPDFIndexValueType = typename JointPDFType::IndexValueType;

  itkGetModifiableObjectMacro(JointPDF, JointPDFType );

  // Declare the type for the derivative calculation
  using JPDFGradientFilterType = itk::GradientRecursiveGaussianImageFilter< JointPDFType >;
  using JPDFGradientImageType = typename JPDFGradientFilterType::OutputImageType;
  using JPDFGradientImagePointer = typename JPDFGradientImageType::Pointer;

  using MarginalGradientFilterType = itk::GradientRecursiveGaussianImageFilter< MarginalPDFType >;
  using MarginalGradientImageType = typename MarginalGradientFilterType::OutputImageType;
  using MarginalGradientImagePointer = typename MarginalGradientImageType::Pointer;

  using JointPDFInterpolatorType = LinearInterpolateImageFunction<JointPDFType,double>;
  using JointPDFInterpolatorPointer = typename JointPDFInterpolatorType::Pointer;
  using MarginalPDFInterpolatorType = LinearInterpolateImageFunction<MarginalPDFType,double>;
  using MarginalPDFInterpolatorPointer = typename MarginalPDFInterpolatorType::Pointer;

  using JointPDFValueType = typename JointPDFType::PixelType;
  using JointPDFRegionType = typename JointPDFType::RegionType;
  using JointPDFSizeType = typename JointPDFType::SizeType;
  using JointPDFSpacingType = typename JointPDFType::SpacingType;


  itkSetClampMacro( NumberOfHistogramBins, SizeValueType, 5, NumericTraits< SizeValueType >::max() );
  itkGetConstReferenceMacro(NumberOfHistogramBins, SizeValueType );

  itkSetMacro(VarianceForJointPDFSmoothing, TInternalComputationValueType);
  itkGetMacro(VarianceForJointPDFSmoothing, TInternalComputationValueType);

  void Initialize() override;

  MeasureType GetValue() const override;

protected:
  JointHistogramMutualInformationImageToImageMetricv4();
  ~JointHistogramMutualInformationImageToImageMetricv4() override = default;

  void InitializeForIteration() const override;

  MeasureType ComputeValue() const;

  inline void ComputeJointPDFPoint( const FixedImagePixelType fixedImageValue, const MovingImagePixelType movingImageValue, JointPDFPointType & jointPDFpoint ) const;

  friend class JointHistogramMutualInformationComputeJointPDFThreaderBase< ThreadedImageRegionPartitioner< Self::VirtualImageDimension >, Self >;
  friend class JointHistogramMutualInformationComputeJointPDFThreaderBase< ThreadedIndexedContainerPartitioner, Self >;
  friend class JointHistogramMutualInformationComputeJointPDFThreader< ThreadedImageRegionPartitioner< Self::VirtualImageDimension >, Self >;
  friend class JointHistogramMutualInformationComputeJointPDFThreader< ThreadedIndexedContainerPartitioner, Self >;

  using JointHistogramMutualInformationDenseComputeJointPDFThreaderType =
      JointHistogramMutualInformationComputeJointPDFThreader< ThreadedImageRegionPartitioner< Self::VirtualImageDimension >, Self >;
  using JointHistogramMutualInformationSparseComputeJointPDFThreaderType =
      JointHistogramMutualInformationComputeJointPDFThreader< ThreadedIndexedContainerPartitioner, Self >;

  typename JointHistogramMutualInformationDenseComputeJointPDFThreaderType::Pointer  m_JointHistogramMutualInformationDenseComputeJointPDFThreader;
  typename JointHistogramMutualInformationSparseComputeJointPDFThreaderType::Pointer m_JointHistogramMutualInformationSparseComputeJointPDFThreader;

  friend class JointHistogramMutualInformationGetValueAndDerivativeThreader< ThreadedImageRegionPartitioner< Superclass::VirtualImageDimension >, Superclass, Self >;
  friend class JointHistogramMutualInformationGetValueAndDerivativeThreader< ThreadedIndexedContainerPartitioner, Superclass, Self >;

  using JointHistogramMutualInformationDenseGetValueAndDerivativeThreaderType =
      JointHistogramMutualInformationGetValueAndDerivativeThreader< ThreadedImageRegionPartitioner< Superclass::VirtualImageDimension >, Superclass, Self >;
  using JointHistogramMutualInformationSparseGetValueAndDerivativeThreaderType =
      JointHistogramMutualInformationGetValueAndDerivativeThreader< ThreadedIndexedContainerPartitioner, Superclass, Self >;

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

  SizeValueType   m_JointHistogramTotalCount{0};

private:
  typename MarginalPDFType::Pointer m_FixedImageMarginalPDF;

  typename MarginalPDFType::Pointer m_MovingImageMarginalPDF;

  mutable typename JointPDFType::Pointer            m_JointPDF;

  TInternalComputationValueType        m_VarianceForJointPDFSmoothing;

  SizeValueType                        m_NumberOfHistogramBins;
  TInternalComputationValueType        m_FixedImageTrueMin;
  TInternalComputationValueType        m_FixedImageTrueMax;
  TInternalComputationValueType        m_MovingImageTrueMin;
  TInternalComputationValueType        m_MovingImageTrueMax;
  TInternalComputationValueType        m_FixedImageBinSize;
  TInternalComputationValueType        m_MovingImageBinSize;

  TInternalComputationValueType        m_JointPDFSum;
  JointPDFSpacingType                  m_JointPDFSpacing;

  TInternalComputationValueType        m_Log2;
  JointPDFIndexValueType               m_Padding;

};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkJointHistogramMutualInformationImageToImageMetricv4.hxx"
#endif

#endif