itkVectorCurvatureAnisotropicDiffusionImageFilter.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
 *
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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
 *  limitations under the License.
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#ifndef itkVectorCurvatureAnisotropicDiffusionImageFilter_h
#define itkVectorCurvatureAnisotropicDiffusionImageFilter_h
 
#include "itkMacro.h"
#include "itkAnisotropicDiffusionImageFilter.h"
#include "itkVectorCurvatureNDAnisotropicDiffusionFunction.h"
 
namespace itk
{
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT VectorCurvatureAnisotropicDiffusionImageFilter
  : public AnisotropicDiffusionImageFilter<TInputImage, TOutputImage>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(VectorCurvatureAnisotropicDiffusionImageFilter);

  using Self = VectorCurvatureAnisotropicDiffusionImageFilter;
  using Superclass = AnisotropicDiffusionImageFilter<TInputImage, TOutputImage>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(VectorCurvatureAnisotropicDiffusionImageFilter);

  using typename Superclass::UpdateBufferType;

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
 
  itkConceptMacro(InputHasNumericTraitsCheck, (Concept::HasNumericTraits<typename TInputImage::PixelType::ValueType>));
  itkConceptMacro(OutputHasNumericTraitsCheck,
                  (Concept::HasNumericTraits<typename TOutputImage::PixelType::ValueType>));
 
protected:
  VectorCurvatureAnisotropicDiffusionImageFilter()
  {
    auto q = VectorCurvatureNDAnisotropicDiffusionFunction<UpdateBufferType>::New();
    this->SetDifferenceFunction(q);
  }
 
  ~VectorCurvatureAnisotropicDiffusionImageFilter() override = default;
 
  void
  InitializeIteration() override
  {
    Superclass::InitializeIteration();
    if (this->GetTimeStep() > 0.5 / std::pow(2.0, static_cast<double>(ImageDimension)))
    {
      itkWarningMacro(
        << "Anisotropic diffusion has attempted to use a time step which may introduce instability into the solution.");
    }
  }
};
} // namespace itk
 
#endif