itkMeanSquareRegistrationFunction.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.
 *  You may obtain a copy of the License at
 *
 *         https://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
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef itkMeanSquareRegistrationFunction_h
#define itkMeanSquareRegistrationFunction_h
 
#include "itkPDEDeformableRegistrationFunction.h"
#include "itkPoint.h"
#include "itkLinearInterpolateImageFunction.h"
#include "itkCentralDifferenceImageFunction.h"
 
namespace itk
{
template <typename TFixedImage, typename TMovingImage, typename TDisplacementField>
class ITK_TEMPLATE_EXPORT MeanSquareRegistrationFunction
  : public PDEDeformableRegistrationFunction<TFixedImage, TMovingImage, TDisplacementField>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(MeanSquareRegistrationFunction);

  using Self = MeanSquareRegistrationFunction;
  using Superclass = PDEDeformableRegistrationFunction<TFixedImage, TMovingImage, TDisplacementField>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(MeanSquareRegistrationFunction);

  using typename Superclass::MovingImageType;
  using typename Superclass::MovingImagePointer;

  using typename Superclass::FixedImageType;
  using typename Superclass::FixedImagePointer;
  using IndexType = typename FixedImageType::IndexType;
  using SizeType = typename FixedImageType::SizeType;
  using SpacingType = typename FixedImageType::SpacingType;

  using typename Superclass::DisplacementFieldType;
  using DisplacementFieldPixelType = typename DisplacementFieldType::PixelType;
  using typename Superclass::DisplacementFieldTypePointer;

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

  using typename Superclass::PixelType;
  using typename Superclass::RadiusType;
  using typename Superclass::NeighborhoodType;
  using typename Superclass::FloatOffsetType;
  using typename Superclass::TimeStepType;

  using CoordinateType = double;
#ifndef ITK_FUTURE_LEGACY_REMOVE
  using CoordRepType ITK_FUTURE_DEPRECATED(
    "ITK 6 discourages using `CoordRepType`. Please use `CoordinateType` instead!") = CoordinateType;
#endif
  using InterpolatorType = InterpolateImageFunction<MovingImageType, CoordinateType>;
  using InterpolatorPointer = typename InterpolatorType::Pointer;
  using PointType = typename InterpolatorType::PointType;
  using DefaultInterpolatorType = LinearInterpolateImageFunction<MovingImageType, CoordinateType>;

  using CovariantVectorType = CovariantVector<double, Self::ImageDimension>;

  using GradientCalculatorType = CentralDifferenceImageFunction<FixedImageType>;
  using GradientCalculatorPointer = typename GradientCalculatorType::Pointer;

  void
  SetMovingImageInterpolator(InterpolatorType * ptr)
  {
    m_MovingImageInterpolator = ptr;
  }

  InterpolatorType *
  GetMovingImageInterpolator()
  {
    return m_MovingImageInterpolator;
  }

  TimeStepType
  ComputeGlobalTimeStep(void * itkNotUsed(GlobalData)) const override
  {
    return m_TimeStep;
  }

  void *
  GetGlobalDataPointer() const override
  {
    auto * global = new GlobalDataStruct();
 
    return global;
  }

  void
  ReleaseGlobalDataPointer(void * GlobalData) const override
  {
    delete (GlobalDataStruct *)GlobalData;
  }

  void
  InitializeIteration() override;

  PixelType
  ComputeUpdate(const NeighborhoodType & neighborhood,
                void *                   globalData,
                const FloatOffsetType &  offset = FloatOffsetType(0.0)) override;
 
protected:
  MeanSquareRegistrationFunction();
  ~MeanSquareRegistrationFunction() override = default;
  void
  PrintSelf(std::ostream & os, Indent indent) const override;

  using FixedImageNeighborhoodIteratorType = ConstNeighborhoodIterator<FixedImageType>;

  struct GlobalDataStruct
  {
    FixedImageNeighborhoodIteratorType m_FixedImageIterator;
  };
 
private:
  SpacingType m_FixedImageSpacing{};

  GradientCalculatorPointer m_FixedImageGradientCalculator{};

  InterpolatorPointer m_MovingImageInterpolator{};

  TimeStepType m_TimeStep{};

  double m_DenominatorThreshold{};

  double m_IntensityDifferenceThreshold{};
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkMeanSquareRegistrationFunction.hxx"
#endif
 
#endif