itkDemonsRegistrationFunction.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 itkDemonsRegistrationFunction_h
#define itkDemonsRegistrationFunction_h

#include "itkPDEDeformableRegistrationFunction.h"
#include "itkPoint.h"
#include "itkLinearInterpolateImageFunction.h"
#include "itkCentralDifferenceImageFunction.h"
#include <mutex>

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

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

  itkNewMacro(Self);

  itkTypeMacro(DemonsRegistrationFunction,
               PDEDeformableRegistrationFunction);

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

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

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

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

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

  using CoordRepType = double;
  using InterpolatorType = InterpolateImageFunction< MovingImageType, CoordRepType >;
  using InterpolatorPointer = typename InterpolatorType::Pointer;
  using PointType = typename InterpolatorType::PointType;
  using DefaultInterpolatorType = LinearInterpolateImageFunction< MovingImageType, CoordRepType >;

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

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

  using MovingImageGradientCalculatorType =
      CentralDifferenceImageFunction< MovingImageType, CoordRepType >;
  using MovingImageGradientCalculatorPointer = typename MovingImageGradientCalculatorType::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();

    global->m_SumOfSquaredDifference  = 0.0;
    global->m_NumberOfPixelsProcessed = 0L;
    global->m_SumOfSquaredChange      = 0;
    return global;
  }

  void ReleaseGlobalDataPointer(void *GlobalData) const override;

  void InitializeIteration() override;

  PixelType  ComputeUpdate( const NeighborhoodType & neighborhood,
                                    void *globalData,
                                    const FloatOffsetType & offset =
                                      FloatOffsetType(0.0) ) override;

  virtual double GetMetric() const
  { return m_Metric; }

  virtual double GetRMSChange() const
  { return m_RMSChange; }

  virtual void SetUseMovingImageGradient(bool flag)
  { m_UseMovingImageGradient = flag; }
  virtual bool GetUseMovingImageGradient() const
  { return m_UseMovingImageGradient; }

  virtual void SetIntensityDifferenceThreshold(double);

  virtual double GetIntensityDifferenceThreshold() const;

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

  using FixedImageNeighborhoodIteratorType = ConstNeighborhoodIterator<FixedImageType>;

  struct GlobalDataStruct {
    double m_SumOfSquaredDifference;
    SizeValueType m_NumberOfPixelsProcessed;
    double m_SumOfSquaredChange;
  };

private:
  //SpacingType                  m_FixedImageSpacing;
  //PointType                    m_FixedImageOrigin;
  PixelType m_ZeroUpdateReturn;
  double    m_Normalizer;

  GradientCalculatorPointer m_FixedImageGradientCalculator;

  MovingImageGradientCalculatorPointer m_MovingImageGradientCalculator;
  bool                                 m_UseMovingImageGradient;

  InterpolatorPointer m_MovingImageInterpolator;

  TimeStepType m_TimeStep;

  double m_DenominatorThreshold;

  double m_IntensityDifferenceThreshold;

  mutable double        m_Metric;
  mutable double        m_SumOfSquaredDifference;
  mutable SizeValueType m_NumberOfPixelsProcessed;
  mutable double        m_RMSChange;
  mutable double        m_SumOfSquaredChange;

  mutable std::mutex m_MetricCalculationLock;
};
} // end namespace itk

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

#endif