itkDiffeomorphicDemonsRegistrationFilter.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.
 *  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
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef itkDiffeomorphicDemonsRegistrationFilter_h
#define itkDiffeomorphicDemonsRegistrationFilter_h

#include "itkPDEDeformableRegistrationFilter.h"
#include "itkESMDemonsRegistrationFunction.h"

#include "itkMultiplyImageFilter.h"
#include "itkExponentialDisplacementFieldImageFilter.h"

namespace itk
{
template< typename TFixedImage, typename TMovingImage, typename TDisplacementField >
class ITK_TEMPLATE_EXPORT DiffeomorphicDemonsRegistrationFilter:
  public PDEDeformableRegistrationFilter< TFixedImage, TMovingImage,
                                          TDisplacementField >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(DiffeomorphicDemonsRegistrationFilter);

  using Self = DiffeomorphicDemonsRegistrationFilter;
  using Superclass = PDEDeformableRegistrationFilter< TFixedImage, TMovingImage, TDisplacementField >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(DiffeomorphicDemonsRegistrationFilter, PDEDeformableRegistrationFilter);

  using FixedImageType = typename Superclass::FixedImageType;
  using FixedImagePointer = typename Superclass::FixedImagePointer;

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

  using DisplacementFieldType = typename Superclass::DisplacementFieldType;
  using DisplacementFieldPointer = typename Superclass::DisplacementFieldPointer;

  using FiniteDifferenceFunctionType = typename Superclass::FiniteDifferenceFunctionType;

  using TimeStepType = typename FiniteDifferenceFunctionType::TimeStepType;

  using DemonsRegistrationFunctionType = ESMDemonsRegistrationFunction< FixedImageType, MovingImageType,
                                         DisplacementFieldType >;
  using GradientType = typename DemonsRegistrationFunctionType::GradientType;

  static constexpr unsigned int ImageDimension = FixedImageType::ImageDimension;

  virtual double GetMetric() const;

  const double & GetRMSChange() const override;

  virtual void SetUseGradientType(GradientType gtype);

  virtual GradientType GetUseGradientType() const;

  itkSetMacro(UseFirstOrderExp, bool);
  itkGetConstMacro(UseFirstOrderExp, bool);
  itkBooleanMacro(UseFirstOrderExp);

  virtual void SetIntensityDifferenceThreshold(double);

  virtual double GetIntensityDifferenceThreshold() const;

  virtual void SetMaximumUpdateStepLength(double);

  virtual double GetMaximumUpdateStepLength() const;

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

  void InitializeIteration() override;

  void AllocateUpdateBuffer() override;

  void ApplyUpdate(const TimeStepType& dt) override;

private:
  DemonsRegistrationFunctionType *  DownCastDifferenceFunctionType();

  const DemonsRegistrationFunctionType *  DownCastDifferenceFunctionType() const;

  using MultiplyByConstantType = MultiplyImageFilter< DisplacementFieldType,
    itk::Image<TimeStepType, ImageDimension>,
    DisplacementFieldType >;

  using FieldExponentiatorType = ExponentialDisplacementFieldImageFilter<
    DisplacementFieldType, DisplacementFieldType >;

  using VectorWarperType = WarpVectorImageFilter<
    DisplacementFieldType,
    DisplacementFieldType, DisplacementFieldType >;

  using FieldInterpolatorType = VectorLinearInterpolateNearestNeighborExtrapolateImageFunction<
    DisplacementFieldType, double >;

  using AdderType = AddImageFilter<
    DisplacementFieldType,
    DisplacementFieldType, DisplacementFieldType >;

  using MultiplyByConstantPointer = typename MultiplyByConstantType::Pointer;
  using FieldExponentiatorPointer = typename FieldExponentiatorType::Pointer;
  using VectorWarperPointer = typename VectorWarperType::Pointer;
  using FieldInterpolatorPointer = typename FieldInterpolatorType::Pointer;
  using FieldInterpolatorOutputType = typename FieldInterpolatorType::OutputType;
  using AdderPointer = typename AdderType::Pointer;

  MultiplyByConstantPointer m_Multiplier;
  FieldExponentiatorPointer m_Exponentiator;
  VectorWarperPointer       m_Warper;
  AdderPointer              m_Adder;
  bool                      m_UseFirstOrderExp{false};
};
} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkDiffeomorphicDemonsRegistrationFilter.hxx"
#endif

#endif