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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 itkLevelSetEquationChanAndVeseInternalTerm_h
#define itkLevelSetEquationChanAndVeseInternalTerm_h
#include "itkLevelSetEquationTermBase.h"
namespace itk
{
/**
* \class LevelSetEquationChanAndVeseInternalTerm
* \brief Class to represent the internal energy Chan And Vese term
*
* \f[
* \delta_{\epsilon}\left( \phi_{k} \left( p \right) \right) \cdot
\left\| I\left( p \right) - \mu_{in} \right\|^2
* \cdot
* \f]
*
* \li \f$ \delta_{epsilon} \f$ is a regularized dirac function,
* \li \f$ k \f$ is the current level-set id,
* \li \f$ I\left( p \right) \f$ is the pixel value at the given location \f$ p \f$,
* \li \f$ \mu_{in} \f$ is the internal mean intensity.
*
* \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 LevelSetEquationChanAndVeseInternalTerm
: public LevelSetEquationTermBase<TInput, TLevelSetContainer>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(LevelSetEquationChanAndVeseInternalTerm);
using Self = LevelSetEquationChanAndVeseInternalTerm;
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(LevelSetEquationChanAndVeseInternalTerm);
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;
using typename Superclass::DomainMapImageFilterType;
using typename Superclass::CacheImageType;
itkSetMacro(Mean, InputPixelRealType);
itkGetMacro(Mean, InputPixelRealType);
/** Update the term parameter values at end of iteration */
void
Update() override;
/** Initialize parameters in the terms prior to an iteration */
void
InitializeParameters() override;
/** Initialize term parameters in the dense case by computing for each pixel location */
void
Initialize(const LevelSetInputIndexType & inputIndex) override;
/** Compute the product of Heaviside functions in the multi-levelset cases */
virtual void
ComputeProduct(const LevelSetInputIndexType & inputIndex, LevelSetOutputRealType & prod);
/** Compute the product of Heaviside functions in the multi-levelset cases
* except the current levelset */
virtual void
ComputeProductTerm(const LevelSetInputIndexType &, LevelSetOutputRealType &)
{}
/** Supply updates at pixels to keep the term parameters always updated */
void
UpdatePixel(const LevelSetInputIndexType & inputIndex,
const LevelSetOutputRealType & oldValue,
const LevelSetOutputRealType & newValue) override;
protected:
LevelSetEquationChanAndVeseInternalTerm();
~LevelSetEquationChanAndVeseInternalTerm() override = default;
/** Returns the term contribution for a given location inputPixel, i.e.
* \f$ \omega_i( p ) \f$. */
LevelSetOutputRealType
Value(const LevelSetInputIndexType & inputIndex) override;
/** Returns the term contribution for a given location inputPixel, i.e.
* \f$ \omega_i( p ) \f$. */
LevelSetOutputRealType
Value(const LevelSetInputIndexType & inputIndex, const LevelSetDataType & data) override;
/** Accumulate contribution to term parameters from a given pixel */
void
Accumulate(const InputPixelType & inputPixel, const LevelSetOutputRealType & heavisideValue);
InputPixelRealType m_Mean{};
InputPixelRealType m_TotalValue{};
LevelSetOutputRealType m_TotalH{};
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkLevelSetEquationChanAndVeseInternalTerm.hxx"
#endif
#endif
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