itkGradientDifferenceImageToImageMetric2.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
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  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
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/*=========================================================================
 
  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkGradientDifferenceImageToImageMetric2.h,v $
  Date:      $Date: 2011-29-04 14:33 $
  Version:   $Revision: 2.0 $
 
  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
 
     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notices for more information.
 
=========================================================================*/
#ifndef itkGradientDifferenceImageToImageMetric2_h
#define itkGradientDifferenceImageToImageMetric2_h
 
#include "itkAdvancedImageToImageMetric.h"
 
#include "itkSobelOperator.h"
#include "itkNeighborhoodOperatorImageFilter.h"
#include "itkPoint.h"
#include "itkCastImageFilter.h"
#include "itkResampleImageFilter.h"
#include "itkOptimizer.h"
#include "itkAdvancedCombinationTransform.h"
#include "itkAdvancedRayCastInterpolateImageFunction.h"
 
namespace itk
{
template <typename TFixedImage, typename TMovingImage>
class ITK_TEMPLATE_EXPORT GradientDifferenceImageToImageMetric
  : public AdvancedImageToImageMetric<TFixedImage, TMovingImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(GradientDifferenceImageToImageMetric);

  using Self = GradientDifferenceImageToImageMetric;
  using Superclass = AdvancedImageToImageMetric<TFixedImage, TMovingImage>;
 
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(GradientDifferenceImageToImageMetric);

#if defined(_MSC_VER) && (_MSC_VER == 1300)
  using RealType = double;
#else
  using typename Superclass::RealType;
#endif
 
  using typename Superclass::TransformType;
  using ScalarType = typename TransformType::ScalarType;
  using typename Superclass::TransformPointer;
  using typename Superclass::ParametersType;
  using typename Superclass::TransformJacobianType;
  using typename Superclass::InterpolatorType;
  using InterpolatorPointer = typename InterpolatorType::Pointer;
  using typename Superclass::MeasureType;
  using typename Superclass::DerivativeType;
  using typename Superclass::FixedImageType;
  using typename Superclass::MovingImageType;
  using typename Superclass::FixedImageConstPointer;
  using typename Superclass::MovingImageConstPointer;
  using FixedImagePixelType = typename TFixedImage::PixelType;
  using MovedImagePixelType = typename TMovingImage::PixelType;
  using MovingImageRegionType = typename MovingImageType::RegionType;
  using ScalesType = typename Optimizer::ScalesType;
 
  itkStaticConstMacro(FixedImageDimension, unsigned int, FixedImageType::ImageDimension);
  itkStaticConstMacro(MovedImageDimension, unsigned int, MovingImageType::ImageDimension);
 
  using CombinationTransformType = typename itk::AdvancedCombinationTransform<ScalarType, FixedImageDimension>;
  using CombinationTransformPointer = typename CombinationTransformType::Pointer;
  using TransformedMovingImageType = itk::Image<FixedImagePixelType, Self::FixedImageDimension>;
  using TransformMovingImageFilterType = itk::ResampleImageFilter<MovingImageType, TransformedMovingImageType>;
  using RayCastInterpolatorType = typename itk::AdvancedRayCastInterpolateImageFunction<MovingImageType, ScalarType>;
  using RayCastInterpolatorPointer = typename RayCastInterpolatorType::Pointer;
  using FixedGradientImageType = itk::Image<RealType, Self::FixedImageDimension>;
  using CastFixedImageFilterType = itk::CastImageFilter<FixedImageType, FixedGradientImageType>;
  using CastFixedImageFilterPointer = typename CastFixedImageFilterType::Pointer;
  using FixedGradientPixelType = typename FixedGradientImageType::PixelType;
  using MovedGradientImageType = itk::Image<RealType, Self::MovedImageDimension>;
  using CastMovedImageFilterType = itk::CastImageFilter<TransformedMovingImageType, MovedGradientImageType>;
  using CastMovedImageFilterPointer = typename CastMovedImageFilterType::Pointer;
  using MovedGradientPixelType = typename MovedGradientImageType::PixelType;

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

  MeasureType
  GetValue(const ParametersType & parameters) const override;

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

  void
  WriteGradientImagesToFiles() const;

  itkSetMacro(Scales, ScalesType);
  itkGetConstReferenceMacro(Scales, ScalesType);

  itkSetMacro(DerivativeDelta, double);
  itkGetConstReferenceMacro(DerivativeDelta, double);
 
protected:
  GradientDifferenceImageToImageMetric() = default;
  ~GradientDifferenceImageToImageMetric() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;

  void
  ComputeMovedGradientRange() const;

  void
  ComputeVariance() const;

  MeasureType
  ComputeMeasure(const ParametersType & parameters, const double * subtractionFactor) const;
 
  using FixedSobelFilter = NeighborhoodOperatorImageFilter<FixedGradientImageType, FixedGradientImageType>;
 
  using MovedSobelFilter = NeighborhoodOperatorImageFilter<MovedGradientImageType, MovedGradientImageType>;
 
private:
  mutable MovedGradientPixelType m_Variance[FixedImageDimension]{};

  mutable MovedGradientPixelType m_MinMovedGradient[MovedImageDimension]{};
  mutable MovedGradientPixelType m_MaxMovedGradient[MovedImageDimension]{};

  mutable FixedGradientPixelType m_MinFixedGradient[FixedImageDimension]{};
  mutable FixedGradientPixelType m_MaxFixedGradient[FixedImageDimension]{};

  typename TransformMovingImageFilterType::Pointer m_TransformMovingImageFilter{
    TransformMovingImageFilterType::New()
  };

  CastFixedImageFilterPointer m_CastFixedImageFilter{ CastFixedImageFilterType::New() };
 
  SobelOperator<FixedGradientPixelType, Self::FixedImageDimension> m_FixedSobelOperators[FixedImageDimension]{};
 
  typename FixedSobelFilter::Pointer m_FixedSobelFilters[Self::FixedImageDimension]{};
 
  ZeroFluxNeumannBoundaryCondition<MovedGradientImageType> m_MovedBoundCond{};
  ZeroFluxNeumannBoundaryCondition<FixedGradientImageType> m_FixedBoundCond{};

  CastMovedImageFilterPointer m_CastMovedImageFilter{ CastMovedImageFilterType::New() };
 
  SobelOperator<MovedGradientPixelType, Self::MovedImageDimension> m_MovedSobelOperators[MovedImageDimension]{};
 
  typename MovedSobelFilter::Pointer m_MovedSobelFilters[Self::MovedImageDimension]{};
 
  ScalesType                  m_Scales{};
  double                      m_DerivativeDelta{ 0.001 };
  double                      m_Rescalingfactor{ 1.0 };
  CombinationTransformPointer m_CombinationTransform{ CombinationTransformType::New() };
};
 
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkGradientDifferenceImageToImageMetric2.hxx"
#endif
 
#endif