itkDefaultImageToImageMetricTraitsv4.h

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 *  Copyright Insight Software Consortium
 *
 *  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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 *         http://www.apache.org/licenses/LICENSE-2.0.txt
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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 TCoordRep = 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 = TCoordRep;

  /* 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>;

  #ifdef ITK_USE_CONCEPT_CHECKING
  itkConceptMacro( OnlyDefinedForFloatingPointTypes0, ( itk::Concept::IsFloatingPoint<FixedRealType> ) );
  itkConceptMacro( OnlyDefinedForFloatingPointTypes1, ( itk::Concept::IsFloatingPoint<MovingRealType> ) );
  #endif // ITK_USE_CONCEPT_CHECKING
};
} // end namespace itk

//#ifndef ITK_MANUAL_INSTANTIATION
//#include "itkDefaultImageToImageMetricTraitsv4.hxx"
//#endif

#endif