itkVarianceOverLastDimensionImageMetric.h

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 *  Copyright UMC Utrecht and contributors
 *
 *  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
 *
 *        http://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 itkVarianceOverLastDimensionImageMetric_h
#define itkVarianceOverLastDimensionImageMetric_h
 
#include "itkSmoothingRecursiveGaussianImageFilter.h"
#include "itkImageRandomCoordinateSampler.h"
#include "itkNearestNeighborInterpolateImageFunction.h"
#include "itkAdvancedImageToImageMetric.h"
 
namespace itk
{

 
template <typename TFixedImage, typename TMovingImage>
class ITK_TEMPLATE_EXPORT VarianceOverLastDimensionImageMetric
  : public AdvancedImageToImageMetric<TFixedImage, TMovingImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(VarianceOverLastDimensionImageMetric);

  using Self = VarianceOverLastDimensionImageMetric;
  using Superclass = AdvancedImageToImageMetric<TFixedImage, TMovingImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
 
  using typename Superclass::FixedImageRegionType;
  using FixedImageSizeType = typename FixedImageRegionType::SizeType;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(VarianceOverLastDimensionImageMetric);

  itkSetMacro(SampleLastDimensionRandomly, bool);
  itkSetMacro(NumSamplesLastDimension, unsigned int);
  itkSetMacro(NumAdditionalSamplesFixed, unsigned int);
  itkSetMacro(ReducedDimensionIndex, unsigned int);
  itkSetMacro(UseZeroAverageDisplacementConstraint, bool);
  itkSetMacro(GridSize, FixedImageSizeType);
  itkSetMacro(TransformIsStackTransform, bool);

  itkGetConstMacro(SampleLastDimensionRandomly, bool);
  itkGetConstMacro(NumSamplesLastDimension, int);

  using typename Superclass::CoordinateRepresentationType;
  using typename Superclass::MovingImageType;
  using typename Superclass::MovingImagePixelType;
  using typename Superclass::MovingImageConstPointer;
  using typename Superclass::FixedImageType;
  using typename Superclass::FixedImageConstPointer;
  using typename Superclass::TransformType;
  using typename Superclass::TransformPointer;
  using typename Superclass::InputPointType;
  using typename Superclass::OutputPointType;
  using typename Superclass::TransformJacobianType;
  using typename Superclass::InterpolatorType;
  using typename Superclass::InterpolatorPointer;
  using typename Superclass::RealType;
  using typename Superclass::GradientPixelType;
  using typename Superclass::GradientImageType;
  using typename Superclass::GradientImagePointer;
  using typename Superclass::FixedImageMaskType;
  using typename Superclass::FixedImageMaskPointer;
  using typename Superclass::MovingImageMaskType;
  using typename Superclass::MovingImageMaskPointer;
  using typename Superclass::MeasureType;
  using typename Superclass::DerivativeType;
  using typename Superclass::DerivativeValueType;
  using typename Superclass::ParametersType;
  using typename Superclass::FixedImagePixelType;
  using typename Superclass::MovingImageRegionType;
  using typename Superclass::ImageSamplerType;
  using typename Superclass::ImageSamplerPointer;
  using typename Superclass::ImageSampleContainerType;
  using typename Superclass::ImageSampleContainerPointer;
  using typename Superclass::FixedImageLimiterType;
  using typename Superclass::MovingImageLimiterType;
  using typename Superclass::FixedImageLimiterOutputType;
  using typename Superclass::MovingImageLimiterOutputType;
  using typename Superclass::MovingImageDerivativeScalesType;

  itkStaticConstMacro(FixedImageDimension, unsigned int, FixedImageType::ImageDimension);

  itkStaticConstMacro(MovingImageDimension, unsigned int, MovingImageType::ImageDimension);

  MeasureType
  GetValue(const ParametersType & parameters) const override;

  void
  GetDerivative(const ParametersType & parameters, DerivativeType & derivative) const override;

  void
  GetValueAndDerivative(const ParametersType & parameters,
                        MeasureType &          Value,
                        DerivativeType &       Derivative) const override;

  void
  Initialize() override;
 
protected:
  VarianceOverLastDimensionImageMetric();
  ~VarianceOverLastDimensionImageMetric() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;


  using typename Superclass::FixedImageIndexType;
  using typename Superclass::FixedImageIndexValueType;
  using typename Superclass::MovingImageIndexType;
  using typename Superclass::FixedImagePointType;
  using FixedImageContinuousIndexType =
    typename itk::ContinuousIndex<CoordinateRepresentationType, FixedImageDimension>;
  using typename Superclass::MovingImagePointType;
  using typename Superclass::MovingImageContinuousIndexType;
  using typename Superclass::BSplineInterpolatorType;
  using typename Superclass::MovingImageDerivativeType;
  using typename Superclass::NonZeroJacobianIndicesType;

  void
  EvaluateTransformJacobianInnerProduct(const TransformJacobianType &     jacobian,
                                        const MovingImageDerivativeType & movingImageDerivative,
                                        DerivativeType &                  imageJacobian) const override;
 
private:
  void
  SampleRandom(const int n, const int m, std::vector<int> & numbers) const;

  bool         m_SampleLastDimensionRandomly{ false };
  unsigned int m_NumSamplesLastDimension{ 10 };
  unsigned int m_NumAdditionalSamplesFixed{};
  unsigned int m_ReducedDimensionIndex{};

  bool m_UseZeroAverageDisplacementConstraint{ true };

  float m_InitialVariance{};

  FixedImageSizeType m_GridSize{};

  bool m_TransformIsStackTransform{ false };
};
 
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkVarianceOverLastDimensionImageMetric.hxx"
#endif
 
#endif // end #ifndef itkVarianceOverLastDimensionImageMetric_h