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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 itkLaplacianSegmentationLevelSetFunction_h
#define itkLaplacianSegmentationLevelSetFunction_h
#include "itkSegmentationLevelSetFunction.h"
namespace itk
{
/** \class LaplacianSegmentationLevelSetFunction
*
* \brief This function is used in LaplacianSegmentationImageFilter to
* segment structures in an image based Laplacian edges.
*
* Assumes a strictly POSITIVE feature image
* \ingroup ITKLevelSets
*/
template <typename TImageType, typename TFeatureImageType = TImageType>
class ITK_TEMPLATE_EXPORT LaplacianSegmentationLevelSetFunction
: public SegmentationLevelSetFunction<TImageType, TFeatureImageType>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(LaplacianSegmentationLevelSetFunction);
/** Standard class type aliases. */
using Self = LaplacianSegmentationLevelSetFunction;
using Superclass = SegmentationLevelSetFunction<TImageType, TFeatureImageType>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using FeatureImageType = TFeatureImageType;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(LaplacianSegmentationLevelSetFunction);
/** Extract some parameters from the superclass. */
using typename Superclass::ImageType;
using typename Superclass::ScalarValueType;
using typename Superclass::FeatureScalarType;
using typename Superclass::RadiusType;
/** Extract some parameters from the superclass. */
static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
void
CalculateSpeedImage() override;
void
Initialize(const RadiusType & r) override
{
Superclass::Initialize(r);
this->SetAdvectionWeight(ScalarValueType{});
this->SetPropagationWeight(-1.0 * NumericTraits<ScalarValueType>::OneValue());
this->SetCurvatureWeight(NumericTraits<ScalarValueType>::OneValue());
}
/**
* The Laplacian level set does not use an advection term. We clamp
* the value to ZERO here because a superclass may try to set it
* otherwise. in fact, SegmentationLevelSetImageFilter tries to set
* it when SetFeatureScaling is called.
*/
void
SetAdvectionWeight(const ScalarValueType value) override
{
if (Math::ExactlyEquals(value, ScalarValueType{}))
{
Superclass::SetAdvectionWeight(value);
}
}
protected:
LaplacianSegmentationLevelSetFunction()
{
this->SetAdvectionWeight(0.0);
this->SetPropagationWeight(1.0);
this->SetCurvatureWeight(1.0);
}
~LaplacianSegmentationLevelSetFunction() override = default;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkLaplacianSegmentationLevelSetFunction.hxx"
# include "itkMath.h"
#endif
#endif
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