itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType > Class Template Reference
[Finite Difference Functions]

This function is used in GeodesicActiveContourLevelSetImageFilter to segment structures in images based on user supplied edge potential map. More...

#include <itkGeodesicActiveContourLevelSetFunction.h>

Inheritance diagram for itk::GeodesicActiveContourLevelSetFunction:

[legend]Collaboration diagram for itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >:

[legend]List of all members.

Public Types
typedef GeodesicActiveContourLevelSetFunction	Self
typedef SegmentationLevelSetFunction< TImageType >	Superclass
typedef SmartPointer< Self >	Pointer
typedef SmartPointer< const Self >	ConstPointer
typedef TFeatureImageType	FeatureImageType
typedef Superclass::ImageType	ImageType
typedef Superclass::NeighborhoodType	NeighborhoodType
typedef Superclass::ScalarValueType	ScalarValueType
typedef Superclass::FeatureScalarType	FeatureScalarType
typedef Superclass::RadiusType	RadiusType
typedef Superclass::FloatOffsetType	FloatOffsetType
typedef Superclass::VectorImageType	VectorImageType
Public Methods
virtual const char *	GetClassName () const
	itkStaticConstMacro (ImageDimension, unsigned int, Superclass::ImageDimension)
virtual void	CalculateSpeedImage ()
virtual void	CalculateAdvectionImage ()
virtual ScalarValueType	CurvatureSpeed (const NeighborhoodType &neighborhood, const FloatOffsetType &offset) const
virtual void	Initialize (const RadiusType &r)
void	SetDerivativeSigma (const double v)
double	GetDerivativeSigma ()
Static Public Methods
Pointer	New ()
Protected Methods
	GeodesicActiveContourLevelSetFunction ()
virtual	~GeodesicActiveContourLevelSetFunction ()
	GeodesicActiveContourLevelSetFunction (const Self &)
void	operator= (const Self &)
void	PrintSelf (std::ostream &os, Indent indent) const

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Detailed Description

template<class TImageType, class TFeatureImageType = TImageType>
class itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >

This function is used in GeodesicActiveContourLevelSetImageFilter to segment structures in images based on user supplied edge potential map.

GeodesicActiveContourLevelSetFunction is a subclass of the generic LevelSetFunction.

It is useful for segmentations based on a user supplied edge potential map which has values close to zero in regions near edges (or high image gradient) and values close to one in regions with relatively constant intensity. Typically, the edge potential map is a function of the gradient, for example:

where is image intensity and is the derivative of Gaussian operator.

In this function both the propagation term \form#47

and the curvature spatial modifier term $ are taken directly from the edge potential image. The edge potential image is set via the SetFeatureImage() method. An advection term is constructed from the negative gradient of the edge potential image. This term behaves like a doublet attracting the contour to the edges.

This implementation is based on:

"Geodesic Active Contours", V. Caselles, R. Kimmel and G. Sapiro. International Journal on Computer Vision, Vol 22, No. 1, pp 61-97, 1997

See also:

LevelSetFunction , SegmentationLevelSetImageFunction , GeodesicActiveContourLevelSetImageFilter

Definition at line 61 of file itkGeodesicActiveContourLevelSetFunction.h.

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Member Typedef Documentation

template<class TImageType, class TFeatureImageType = TImageType> typedef SmartPointer<const Self> itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::ConstPointer

Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 69 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef TFeatureImageType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::FeatureImageType

Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 70 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef Superclass::FeatureScalarType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::FeatureScalarType

Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 82 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef Superclass::FloatOffsetType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::FloatOffsetType

A floating point offset from an image grid location. Used for interpolation among grid values in a neighborhood. Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 84 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef Superclass::ImageType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::ImageType

Extract some parameters from the superclass. Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 79 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef Superclass::NeighborhoodType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::NeighborhoodType

The type of data structure that is passed to this function object to evaluate at a pixel that does not lie on a data set boundary. Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 80 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef SmartPointer<Self> itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::Pointer

Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 68 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef Superclass::RadiusType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::RadiusType

Neighborhood radius type Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 83 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef Superclass::ScalarValueType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::ScalarValueType

Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 81 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef GeodesicActiveContourLevelSetFunction itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::Self

Standard class typedefs. Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 66 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef SegmentationLevelSetFunction<TImageType> itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::Superclass

Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 67 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> typedef Superclass::VectorImageType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::VectorImageType

Define an image type for the advection field. Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 85 of file itkGeodesicActiveContourLevelSetFunction.h.

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Constructor & Destructor Documentation

template<class TImageType, class TFeatureImageType = TImageType> itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::GeodesicActiveContourLevelSetFunction (    )  [inline, protected]

Definition at line 120 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> virtual itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::~GeodesicActiveContourLevelSetFunction (    )  [inline, protected, virtual]

Definition at line 128 of file itkGeodesicActiveContourLevelSetFunction.h. References HardConnectedComponentImageFilter::PrintSelf().

template<class TImageType, class TFeatureImageType = TImageType> itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::GeodesicActiveContourLevelSetFunction (  const Self &    )  [protected]

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Member Function Documentation

template<class TImageType, class TFeatureImageType = TImageType> virtual void itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::CalculateAdvectionImage (    )  [virtual]

Compute the advection field from feature image. Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.

template<class TImageType, class TFeatureImageType = TImageType> virtual void itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::CalculateSpeedImage (    )  [virtual]

Compute speed image from feature image. Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.

template<class TImageType, class TFeatureImageType = TImageType> virtual ScalarValueType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::CurvatureSpeed (  const NeighborhoodType &    neighborhood, const FloatOffsetType &    offset )  const [inline, virtual]

The curvature speed is same as the propagation speed. Reimplemented from itk::LevelSetFunctionBase< TImageType >. Definition at line 98 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> virtual const char* itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::GetClassName (    )  const [virtual]

Run-time type information (and related methods) Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.

template<class TImageType, class TFeatureImageType = TImageType> double itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::GetDerivativeSigma (    )  [inline]

Set/Get the sigma for the Gaussian kernel used to compute the gradient of the feature image needed for the advection term of the equation. Definition at line 106 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> virtual void itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::Initialize (  const RadiusType &    r )  [inline, virtual]

This method creates the appropriate member variable operators for the level-set calculations. The argument to this function is a the radius necessary for performing the level-set calculations. Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >. Definition at line 110 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::itkStaticConstMacro (  ImageDimension   , unsigned    int, Superclass::ImageDimension    )

Extract some parameters from the superclass. Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.

template<class TImageType, class TFeatureImageType = TImageType> Pointer itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::New (    )  [static]

Method for creation through the object factory. Reimplemented from itk::LevelSetFunction< TImageType >.

template<class TImageType, class TFeatureImageType = TImageType> void itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::operator= (  const Self &    )  [protected]

Reimplemented from itk::LevelSetFunction< TImageType >.

template<class TImageType, class TFeatureImageType = TImageType> void itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::PrintSelf (  std::ostream &    os, Indent    indent )  const [inline, protected, virtual]

Methods invoked by Print() to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes. Reimplemented from itk::LevelSetFunction< TImageType >. Definition at line 133 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType> void itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::SetDerivativeSigma (  const double    v )  [inline]

Set/Get the sigma for the Gaussian kernel used to compute the gradient of the feature image needed for the advection term of the equation. Definition at line 104 of file itkGeodesicActiveContourLevelSetFunction.h.

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The documentation for this class was generated from the following file:

• itkGeodesicActiveContourLevelSetFunction.h

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