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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 itkLevelSetEquationLaplacianTerm_h
#define itkLevelSetEquationLaplacianTerm_h
#include "itkLevelSetEquationTermBase.h"
#include "itkZeroFluxNeumannBoundaryCondition.h"
#include "itkConstNeighborhoodIterator.h"
#include "itkVector.h"
#include "vnl/vnl_matrix_fixed.h"
namespace itk
{
/**
* \class LevelSetEquationLaplacianTerm
* \brief Derived class to represents a propagation term in the level-set evolution PDE
*
* \f[
* LaplacianImage( p ) \cdot \Delta \phi( p )
* \f]
*
* \li LaplacianImage denotes the Laplacian image set by the user
* \li \f$ \Delta \phi \f$ denotes the Laplacian of the level-set function \f$\phi \f$
*
* \tparam TInput Input Image Type
* \tparam TLevelSetContainer Level set function container type
* \ingroup ITKLevelSetsv4
*/
template <typename TInput, // Input image or mesh
typename TLevelSetContainer>
class ITK_TEMPLATE_EXPORT LevelSetEquationLaplacianTerm : public LevelSetEquationTermBase<TInput, TLevelSetContainer>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(LevelSetEquationLaplacianTerm);
using Self = LevelSetEquationLaplacianTerm;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using Superclass = LevelSetEquationTermBase<TInput, TLevelSetContainer>;
/** Method for creation through object factory */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(LevelSetEquationLaplacianTerm);
using typename Superclass::InputImageType;
using typename Superclass::InputImagePointer;
using typename Superclass::InputPixelType;
using typename Superclass::InputPixelRealType;
using typename Superclass::LevelSetContainerType;
using typename Superclass::LevelSetContainerPointer;
using typename Superclass::LevelSetType;
using typename Superclass::LevelSetPointer;
using typename Superclass::LevelSetOutputPixelType;
using typename Superclass::LevelSetOutputRealType;
using typename Superclass::LevelSetInputIndexType;
using typename Superclass::LevelSetGradientType;
using typename Superclass::LevelSetHessianType;
using typename Superclass::LevelSetIdentifierType;
using typename Superclass::HeavisideType;
using typename Superclass::HeavisideConstPointer;
using typename Superclass::LevelSetDataType;
static constexpr unsigned int ImageDimension = InputImageType::ImageDimension;
/** Neighborhood radius type */
using DefaultBoundaryConditionType = ZeroFluxNeumannBoundaryCondition<InputImageType>;
using RadiusType = typename ConstNeighborhoodIterator<InputImageType>::RadiusType;
using NeighborhoodType = ConstNeighborhoodIterator<InputImageType, DefaultBoundaryConditionType>;
using NeighborhoodScalesType = Vector<LevelSetOutputRealType, Self::ImageDimension>;
/** Update the term parameter values at end of iteration */
void
Update() override;
/** Initialize the parameters in the terms prior to an iteration */
void
InitializeParameters() override;
/** \todo to be documented. */
void
Initialize(const LevelSetInputIndexType &) override;
/** Supply updates at pixels to keep the term parameters always updated */
void
UpdatePixel(const LevelSetInputIndexType & iP,
const LevelSetOutputRealType & oldValue,
const LevelSetOutputRealType & newValue) override;
protected:
LevelSetEquationLaplacianTerm();
~LevelSetEquationLaplacianTerm() override = default;
/** Return the spatial speed dependence a given pixel location
* Usually, it is constant across the image domain */
LevelSetOutputRealType
LaplacianSpeed(const LevelSetInputIndexType & iP) const;
/** Returns the term contribution for a given location iP, i.e.
* \f$ \omega_i( p ) \f$. */
LevelSetOutputRealType
Value(const LevelSetInputIndexType & iP) override;
/** Returns the term contribution for a given location iP, i.e.
* \f$ \omega_i( p ) \f$. */
LevelSetOutputRealType
Value(const LevelSetInputIndexType & iP, const LevelSetDataType & iData) override;
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkLevelSetEquationLaplacianTerm.hxx"
#endif
#endif
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