itkCannySegmentationLevelSetFunction.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 itkCannySegmentationLevelSetFunction_h
#define itkCannySegmentationLevelSetFunction_h
 
#include "itkSegmentationLevelSetFunction.h"
#include "itkCastImageFilter.h"
#include "itkCannyEdgeDetectionImageFilter.h"
#include "itkDanielssonDistanceMapImageFilter.h"
 
namespace itk
{
template <typename TImageType, typename TFeatureImageType = TImageType>
class ITK_TEMPLATE_EXPORT CannySegmentationLevelSetFunction
  : public SegmentationLevelSetFunction<TImageType, TFeatureImageType>
{
public:
  ITK_DISALLOW_COPY_AND_MOVE(CannySegmentationLevelSetFunction);

  using Self = CannySegmentationLevelSetFunction;
  using Superclass = SegmentationLevelSetFunction<TImageType, TFeatureImageType>;
  using Pointer = SmartPointer<Self>;
  using ConstPointer = SmartPointer<const Self>;
  using FeatureImageType = TFeatureImageType;

  itkNewMacro(Self);

  itkOverrideGetNameOfClassMacro(CannySegmentationLevelSetFunction);

  using typename Superclass::ImageType;
  using typename Superclass::ScalarValueType;
  using typename Superclass::VectorImageType;
  using typename Superclass::FeatureScalarType;
  using typename Superclass::RadiusType;

  static constexpr unsigned int ImageDimension = Superclass::ImageDimension;

  void
  SetThreshold(ScalarValueType v)
  {
    m_Threshold = v;
  }
  ScalarValueType
  GetThreshold() const
  {
    return m_Threshold;
  }


  void
  SetVariance(double v)
  {
    m_Variance = v;
  }
  [[nodiscard]] double
  GetVariance() const
  {
    return m_Variance;
  }


  void
  CalculateSpeedImage() override;

  void
  CalculateAdvectionImage() override;

  virtual void
  CalculateDistanceImage();
 
  void
  Initialize(const RadiusType & r) override
  {
    Superclass::Initialize(r);
 
    this->SetAdvectionWeight(-1.0 * NumericTraits<ScalarValueType>::OneValue());
    this->SetPropagationWeight(-1.0 * NumericTraits<ScalarValueType>::OneValue());
    this->SetCurvatureWeight(NumericTraits<ScalarValueType>::OneValue());
  }
 
  ImageType *
  GetCannyImage()
  {
    return m_Canny->GetOutput();
  }
 
protected:
  CannySegmentationLevelSetFunction()
    : m_Variance(0.0)
    , m_Threshold(ScalarValueType{})
    , m_Canny(CannyEdgeDetectionImageFilter<ImageType, ImageType>::New())
    , m_Distance(DanielssonDistanceMapImageFilter<ImageType, ImageType>::New())
    , m_Caster(CastImageFilter<FeatureImageType, ImageType>::New())
  {}
 
  ~CannySegmentationLevelSetFunction() override = default;
 
private:
  ScalarValueType m_Variance{};
  double          m_Threshold{};
 
  typename CannyEdgeDetectionImageFilter<ImageType, ImageType>::Pointer m_Canny{};
 
  typename DanielssonDistanceMapImageFilter<ImageType, ImageType>::Pointer m_Distance{};
 
  typename CastImageFilter<FeatureImageType, ImageType>::Pointer m_Caster{};

  template <typename DummyImagePointerType>
  void
  AssignCannyInput(typename FeatureImageType::Pointer & feature, DummyImagePointerType &)
  {
    m_Caster->SetInput(feature);
    m_Canny->SetInput(m_Caster->GetOutput());
  }

  void
  AssignCannyInput(typename FeatureImageType::Pointer & feature, typename FeatureImageType::Pointer &)
  {
    m_Canny->SetInput(feature);
  }
};
} // end namespace itk
 
#ifndef ITK_MANUAL_INSTANTIATION
#  include "itkCannySegmentationLevelSetFunction.hxx"
#endif
 
#endif