itkVectorGradientNDAnisotropicDiffusionFunction.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
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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
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#ifndef itkVectorGradientNDAnisotropicDiffusionFunction_h
#define itkVectorGradientNDAnisotropicDiffusionFunction_h

#include "itkVectorAnisotropicDiffusionFunction.h"
#include "itkNeighborhoodAlgorithm.h"
#include "itkVectorNeighborhoodInnerProduct.h"
#include "itkDerivativeOperator.h"

namespace itk
{
template< typename TImage >
class ITK_TEMPLATE_EXPORT VectorGradientNDAnisotropicDiffusionFunction:
  public VectorAnisotropicDiffusionFunction< TImage >
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(VectorGradientNDAnisotropicDiffusionFunction);

  using Self = VectorGradientNDAnisotropicDiffusionFunction;
  using Superclass = VectorAnisotropicDiffusionFunction< TImage >;
  using Pointer = SmartPointer< Self >;
  using ConstPointer = SmartPointer< const Self >;

  itkNewMacro(Self);

  itkTypeMacro(VectorGradientNDAnisotropicDiffusionFunction,
               ScalarAnisotropicDiffusionFunction);

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

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
  static constexpr unsigned int VectorDimension = Superclass::VectorDimension;

  using ScalarValueType = typename PixelType::ValueType;

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

  void InitializeIteration() override
  {
    m_K = this->GetAverageGradientMagnitudeSquared() * this->GetConductanceParameter()
          * this->GetConductanceParameter() * -2.0f;
  }

protected:
  VectorGradientNDAnisotropicDiffusionFunction();
  ~VectorGradientNDAnisotropicDiffusionFunction() override = default;

private:
  VectorNeighborhoodInnerProduct< ImageType > m_InnerProduct;

  std::slice x_slice[ImageDimension];
  std::slice xa_slice[ImageDimension][ImageDimension];
  std::slice xd_slice[ImageDimension][ImageDimension];

  DerivativeOperator< ScalarValueType,
                      Self::ImageDimension > m_DerivativeOperator;

  ScalarValueType m_K;

  static double m_MIN_NORM;

  SizeValueType m_Stride[ImageDimension];
  SizeValueType m_Center;
};
} // end namespace itk

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

#endif