itkDefaultImageToImageMetricTraitsv4.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.
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 *  See the License for the specific language governing permissions and
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#ifndef itkDefaultImageToImageMetricTraitsv4_h
#define itkDefaultImageToImageMetricTraitsv4_h
 
#include "itkImage.h"
#include "itkCovariantVector.h"
#include "itkCentralDifferenceImageFunction.h"
#include "itkGradientRecursiveGaussianImageFilter.h"
#include "itkObjectToObjectMetricBase.h"
 
namespace itk
{
template <typename TFixedImageType,
          typename TMovingImageType,
          typename TVirtualImageType,
          typename TCoordinate = double>
class DefaultImageToImageMetricTraitsv4
{
public:
  using Self = DefaultImageToImageMetricTraitsv4;
 
  using FixedImageType = TFixedImageType;
  using MovingImageType = TMovingImageType;
  using VirtualImageType = TVirtualImageType;
 
  using FixedImagePixelType = typename FixedImageType::PixelType;
  using MovingImagePixelType = typename MovingImageType::PixelType;
 
  using CoordinateRepresentationType = TCoordinate;
 
  /* Image dimension accessors */
  using ImageDimensionType = unsigned int;
  static constexpr ImageDimensionType FixedImageDimension = FixedImageType::ImageDimension;
  static constexpr ImageDimensionType MovingImageDimension = MovingImageType::ImageDimension;
  static constexpr ImageDimensionType VirtualImageDimension = VirtualImageType::ImageDimension;
 
  using FixedImageGradientType = CovariantVector<CoordinateRepresentationType, Self::FixedImageDimension>;
  using MovingImageGradientType = CovariantVector<CoordinateRepresentationType, Self::MovingImageDimension>;
 
  using VirtualImageGradientType = CovariantVector<CoordinateRepresentationType, Self::VirtualImageDimension>;
 
  using FixedImageComponentGradientType = FixedImageGradientType;
  using MovingImageComponentGradientType = MovingImageGradientType;
  using VirtualImageComponentGradientType = VirtualImageGradientType;
 
  using FixedImageGradientConvertType = DefaultConvertPixelTraits<FixedImageGradientType>;
  using MovingImageGradientConvertType = DefaultConvertPixelTraits<MovingImageGradientType>;

  using FixedRealType = typename NumericTraits<FixedImagePixelType>::RealType;
  using FixedGradientPixelType = CovariantVector<FixedRealType, Self::FixedImageDimension>;
  using FixedImageGradientImageType = Image<FixedGradientPixelType, Self::FixedImageDimension>;
 
  using FixedImageGradientFilterType = ImageToImageFilter<FixedImageType, FixedImageGradientImageType>;
 
  using MovingRealType = typename NumericTraits<MovingImagePixelType>::RealType;
  using MovingGradientPixelType = CovariantVector<MovingRealType, Self::MovingImageDimension>;
  using MovingImageGradientImageType = Image<MovingGradientPixelType, Self::MovingImageDimension>;
 
  using MovingImageGradientFilterType = ImageToImageFilter<MovingImageType, MovingImageGradientImageType>;

  using DefaultFixedImageGradientFilter =
    GradientRecursiveGaussianImageFilter<FixedImageType, FixedImageGradientImageType>;
  using DefaultMovingImageGradientFilter =
    GradientRecursiveGaussianImageFilter<MovingImageType, MovingImageGradientImageType>;

  using FixedImageGradientCalculatorType =
    ImageFunction<FixedImageType, CovariantVector<double, Self::FixedImageDimension>, CoordinateRepresentationType>;
  using MovingImageGradientCalculatorType =
    ImageFunction<MovingImageType, CovariantVector<double, Self::MovingImageDimension>, CoordinateRepresentationType>;
 
  using DefaultFixedImageGradientCalculator =
    CentralDifferenceImageFunction<FixedImageType, CoordinateRepresentationType>;
  using DefaultMovingImageGradientCalculator =
    CentralDifferenceImageFunction<MovingImageType, CoordinateRepresentationType>;

  itkConceptMacro(OnlyDefinedForFloatingPointTypes0, (itk::Concept::IsFloatingPoint<FixedRealType>));
  itkConceptMacro(OnlyDefinedForFloatingPointTypes1, (itk::Concept::IsFloatingPoint<MovingRealType>));
};
} // end namespace itk
 
// #ifndef ITK_MANUAL_INSTANTIATION
// #include "itkDefaultImageToImageMetricTraitsv4.hxx"
// #endif
 
#endif