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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 itkLevelSetEquationChanAndVeseExternalTerm_h
#define itkLevelSetEquationChanAndVeseExternalTerm_h
#include "itkLevelSetEquationChanAndVeseInternalTerm.h"
#include "itkNumericTraits.h"
namespace itk
{
/**
* \class LevelSetEquationChanAndVeseExternalTerm
* \brief Class to represent the external energy Chan And Vese term
*
* \f[
* \delta_{\epsilon}\left( \phi_{k}\left( p \right) \right) \cdot
* \prod_{i = 1, i \neq k}^{N} \left( 1 - H_{\epsilon} \left( \phi_i\left( p \right) \right) \right) \cdot
\left\| I(p) - \mu_{out} \right\|^2
* \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$,
* \li \f$ H_{\epsilon} \f$ is a regularized Heaviside function,
* \li \f$ \mu_{out} \f$ is the external 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 LevelSetEquationChanAndVeseExternalTerm
: public LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(LevelSetEquationChanAndVeseExternalTerm);
using Self = LevelSetEquationChanAndVeseExternalTerm;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
using Superclass = LevelSetEquationChanAndVeseInternalTerm<TInput, TLevelSetContainer>;
/** Method for creation through object factory */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(LevelSetEquationChanAndVeseExternalTerm);
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::DomainMapImageFilterType;
using typename Superclass::CacheImageType;
using DomainIteratorType = typename DomainMapImageFilterType::DomainMapType::const_iterator;
using IdListType = typename LevelSetContainerType::IdListType;
using IdListIterator = typename LevelSetContainerType::IdListIterator;
using IdListConstIterator = typename LevelSetContainerType::IdListConstIterator;
using typename Superclass::HeavisideType;
using typename Superclass::HeavisideConstPointer;
/** Compute the product of Heaviside functions in the multi-levelset cases */
void
ComputeProduct(const LevelSetInputIndexType & iP, LevelSetOutputRealType & prod) override;
/** Compute the product of Heaviside functions in the multi-levelset cases
* except the current levelset */
void
ComputeProductTerm(const LevelSetInputIndexType & iP, LevelSetOutputRealType & prod) 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:
LevelSetEquationChanAndVeseExternalTerm();
~LevelSetEquationChanAndVeseExternalTerm() override = default;
private:
DomainMapImageFilterType * m_DomainMapImageFilter{};
CacheImageType * m_CacheImage{};
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkLevelSetEquationChanAndVeseExternalTerm.hxx"
#endif
#endif
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