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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkShapePriorSegmentationLevelSetFunction.h,v $
Language: C++
Date: $Date: 2003-09-10 14:28:39 $
Version: $Revision: 1.5 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#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
*/
template <class TImageType, class TFeatureImageType = TImageType>
class ITK_EXPORT ShapePriorSegmentationLevelSetFunction
: public SegmentationLevelSetFunction<TImageType, TFeatureImageType>
{
public:
/** Standard class typedefs. */
typedef ShapePriorSegmentationLevelSetFunction Self;
typedef SegmentationLevelSetFunction<TImageType,TFeatureImageType> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
typedef TFeatureImageType FeatureImageType;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods) */
itkTypeMacro( ShapePriorSegmentationLevelSetFunction, SegmentationLevelSetFunction );
/** Extract some parameters from the superclass. */
typedef typename Superclass::ImageType ImageType;
typedef typename Superclass::NeighborhoodType NeighborhoodType;
typedef typename Superclass::ScalarValueType ScalarValueType;
typedef typename Superclass::FeatureScalarType FeatureScalarType;
typedef typename Superclass::RadiusType RadiusType;
typedef typename Superclass::FloatOffsetType FloatOffsetType;
typedef typename Superclass::VectorImageType VectorImageType;
typedef typename Superclass::PixelType PixelType;
typedef typename Superclass::TimeStepType TimeStepType;
typedef typename Superclass::IndexType IndexType;
typedef typename Superclass::ContinuousIndexType ContinuousIndexType;
/** Extract some parameters from the superclass. */
itkStaticConstMacro(ImageDimension, unsigned int,
Superclass::ImageDimension);
/** ShapeFunction typedef support. */
typedef ShapeSignedDistanceFunction<double,
itkGetStaticConstMacro(ImageDimension)> ShapeFunctionType;
typedef typename ShapeFunctionType::ConstPointer ShapeFunctionPointer;
/** 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. */
virtual PixelType ComputeUpdate(const NeighborhoodType &neighborhood,
void *globalData,
const FloatOffsetType& = FloatOffsetType(0.0));
/** Compute global time step from the global data structure. */
virtual TimeStepType ComputeGlobalTimeStep( void *globalData ) const;
/** A global data type used to store values needed to compute the time step. */
typedef typename Superclass::GlobalDataStruct GlobalDataStruct;
struct ShapePriorGlobalDataStruct : public GlobalDataStruct
{
ScalarValueType m_MaxShapePriorChange;
};
/** Returns a pointer to a global data structure for computing time step. */
virtual void *GetGlobalDataPointer() const
{
ShapePriorGlobalDataStruct *ans = new ShapePriorGlobalDataStruct();
ans->m_MaxAdvectionChange = NumericTraits<ScalarValueType>::Zero;
ans->m_MaxPropagationChange = NumericTraits<ScalarValueType>::Zero;
ans->m_MaxCurvatureChange = NumericTraits<ScalarValueType>::Zero;
ans->m_MaxShapePriorChange = NumericTraits<ScalarValueType>::Zero;
return ans;
}
/** Release the global data structure. */
virtual void ReleaseGlobalDataPointer(void *GlobalData) const
{ delete (ShapePriorGlobalDataStruct *) GlobalData; }
protected:
ShapePriorSegmentationLevelSetFunction();
virtual ~ShapePriorSegmentationLevelSetFunction() {}
ShapePriorSegmentationLevelSetFunction(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
void PrintSelf(std::ostream& os, Indent indent) const;
private:
ShapeFunctionPointer m_ShapeFunction;
ScalarValueType m_ShapePriorWeight;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkShapePriorSegmentationLevelSetFunction.txx"
#endif
#endif
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