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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 itkShapePriorSegmentationLevelSetFunction_h
#define itkShapePriorSegmentationLevelSetFunction_h
#include "itkSegmentationLevelSetFunction.h"
#include "itkShapeSignedDistanceFunction.h"
namespace itk
{
/** \class ShapePriorSegmentationLevelSetFunction
*
* \brief This function is used in ShapePriorSegmentationLevelSetFilter to
* segment structures in an image based on user supplied edge potential map and
* shape model.
*
* This class extends the basic LevelSetFunction with a shape prior term
* as developed in [1].
*
* \f$ \zeta( \phi^{*} - \phi) \f$
*
* where \f$ \phi^{*} \f$ is the signed distance function from a target shape
* and \f$ \zeta \f$ is a scalar constant.
*
* The target shape signed distance function is supplied through a
* ShapeSignedDistanceFunction object.
*
* \sa LevelSetFunction
* \sa SegmentationLevelSetImageFunction
* \sa ShapeSignedDistanceFunction
*
* \par REFERENCES
* \par
* [1] Leventon, M.E. et al. "Statistical Shape Influence in Geodesic Active Contours", CVPR 2000.
*
* \ingroup FiniteDifferenceFunctions
* \ingroup ITKLevelSets
*/
template <typename TImageType, typename TFeatureImageType = TImageType>
class ITK_TEMPLATE_EXPORT ShapePriorSegmentationLevelSetFunction
: public SegmentationLevelSetFunction<TImageType, TFeatureImageType>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ShapePriorSegmentationLevelSetFunction);
/** Standard class type aliases. */
using Self = ShapePriorSegmentationLevelSetFunction;
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(ShapePriorSegmentationLevelSetFunction);
/** Extract some parameters from the superclass. */
using typename Superclass::ImageType;
using typename Superclass::NeighborhoodType;
using typename Superclass::ScalarValueType;
using typename Superclass::FeatureScalarType;
using typename Superclass::RadiusType;
using typename Superclass::FloatOffsetType;
using typename Superclass::VectorImageType;
using typename Superclass::PixelType;
using typename Superclass::TimeStepType;
using typename Superclass::IndexType;
using typename Superclass::ContinuousIndexType;
/** Extract some parameters from the superclass. */
static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
/** ShapeFunction type alias support */
using ShapeFunctionType = ShapeSignedDistanceFunction<double, Self::ImageDimension>;
using ShapeFunctionPointer = typename ShapeFunctionType::ConstPointer;
/** Zeta. The ShapePriorWeight scales the shape prior term values. */
void
SetShapePriorWeight(const ScalarValueType p)
{
m_ShapePriorWeight = p;
}
ScalarValueType
GetShapePriorWeight() const
{
return m_ShapePriorWeight;
}
/** The ShapeFunction encapsulates the signed distance to the shape used to
* influence the evolution of the level set. */
void
SetShapeFunction(const ShapeFunctionType * ptr)
{
m_ShapeFunction = ptr;
}
const ShapeFunctionType *
GetShapeFunction() const
{
return m_ShapeFunction;
}
/** Compute the equation value with the additional shape prior term. */
PixelType
ComputeUpdate(const NeighborhoodType & neighborhood,
void * gd,
const FloatOffsetType & = FloatOffsetType(0.0)) override;
/** Compute global time step from the global data structure. */
TimeStepType
ComputeGlobalTimeStep(void * gd) const override;
/** A global data type used to store values needed to compute the time step.
*/
struct ShapePriorGlobalDataStruct : public Superclass::GlobalDataStruct
{
ScalarValueType m_MaxShapePriorChange;
};
/** Returns a pointer to a global data structure for computing time step. */
void *
GetGlobalDataPointer() const override
{
auto * ans = new ShapePriorGlobalDataStruct();
ans->m_MaxAdvectionChange = ScalarValueType{};
ans->m_MaxPropagationChange = ScalarValueType{};
ans->m_MaxCurvatureChange = ScalarValueType{};
ans->m_MaxShapePriorChange = ScalarValueType{};
return ans;
}
/** Release the global data structure. */
void
ReleaseGlobalDataPointer(void * GlobalData) const override
{
delete (ShapePriorGlobalDataStruct *)GlobalData;
}
protected:
ShapePriorSegmentationLevelSetFunction();
~ShapePriorSegmentationLevelSetFunction() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
private:
ShapeFunctionPointer m_ShapeFunction{};
ScalarValueType m_ShapePriorWeight{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkShapePriorSegmentationLevelSetFunction.hxx"
#endif
#endif
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