itkGradientNDAnisotropicDiffusionFunction.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 itkGradientNDAnisotropicDiffusionFunction_h
#define itkGradientNDAnisotropicDiffusionFunction_h
 
#include "itkScalarAnisotropicDiffusionFunction.h"
#include "itkNeighborhoodAlgorithm.h"
#include "itkNeighborhoodInnerProduct.h"
#include "itkDerivativeOperator.h"
 
namespace itk
{
template <typename TImage>
class ITK_TEMPLATE_EXPORT GradientNDAnisotropicDiffusionFunction : public ScalarAnisotropicDiffusionFunction<TImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(GradientNDAnisotropicDiffusionFunction);

  using Self = GradientNDAnisotropicDiffusionFunction;
  using Superclass = ScalarAnisotropicDiffusionFunction<TImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(GradientNDAnisotropicDiffusionFunction);

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

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

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

  void
  InitializeIteration() override
  {
    m_K = static_cast<PixelType>(this->GetAverageGradientMagnitudeSquared() * this->GetConductanceParameter() *
                                 this->GetConductanceParameter() * -2.0f);
  }
 
protected:
  GradientNDAnisotropicDiffusionFunction();
  ~GradientNDAnisotropicDiffusionFunction() override = default;

  NeighborhoodInnerProduct<ImageType> m_InnerProduct{};

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

  DerivativeOperator<PixelType, Self::ImageDimension> m_DerivativeOperator{};

  PixelType m_K{};
 
  NeighborhoodSizeValueType m_Center{};
  NeighborhoodSizeValueType m_Stride[ImageDimension]{};
 
  static double m_MIN_NORM;
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkGradientNDAnisotropicDiffusionFunction.hxx"
#endif
 
#endif