ITK  4.1.0
Insight Segmentation and Registration Toolkit
Public Types | Public Member Functions | Static Public Member Functions | Static Public Attributes | Protected Member Functions | Private Attributes
itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType > Class Template Reference

#include <itkGeodesicActiveContourLevelSetFunction.h>

+ Inheritance diagram for itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >:
+ Collaboration diagram for itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >:

List of all members.

Public Types

typedef SmartPointer< const SelfConstPointer
typedef TFeatureImageType FeatureImageType
typedef
Superclass::FeatureScalarType 
FeatureScalarType
typedef Superclass::FloatOffsetType FloatOffsetType
typedef
Superclass::GlobalDataStruct 
GlobalDataStruct
typedef Superclass::ImageType ImageType
typedef
Superclass::NeighborhoodType 
NeighborhoodType
typedef SmartPointer< SelfPointer
typedef Superclass::RadiusType RadiusType
typedef Superclass::ScalarValueType ScalarValueType
typedef
GeodesicActiveContourLevelSetFunction 
Self
typedef
SegmentationLevelSetFunction
< TImageType,
TFeatureImageType > 
Superclass
typedef Superclass::VectorImageType VectorImageType

Public Member Functions

virtual void CalculateAdvectionImage ()
virtual void CalculateSpeedImage ()
virtual ::itk::LightObject::Pointer CreateAnother (void) const
virtual ScalarValueType CurvatureSpeed (const NeighborhoodType &neighborhood, const FloatOffsetType &offset, GlobalDataStruct *gd) const
virtual const char * GetNameOfClass () const
virtual void Initialize (const RadiusType &r)
void SetDerivativeSigma (const double v)
double GetDerivativeSigma ()

Static Public Member Functions

static Pointer New ()

Static Public Attributes

static const unsigned int ImageDimension = Superclass::ImageDimension

Protected Member Functions

 GeodesicActiveContourLevelSetFunction ()
 GeodesicActiveContourLevelSetFunction (const Self &)
void operator= (const Self &)
void PrintSelf (std::ostream &os, Indent indent) const
virtual ~GeodesicActiveContourLevelSetFunction ()

Private Attributes

double m_DerivativeSigma

Detailed Description

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

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

IMPORTANT
The LevelSetFunction class contain additional information necessary to gain full understanding of how to use this function.

GeodesicActiveContourLevelSetFunction is a subclass of the generic LevelSetFunction. It is used to segment structures in an image based on a user supplied edge potential map $ g(I) $, 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:

\[ g(I) = 1 / ( 1 + | (\nabla * G)(I)| ) \]

\[ g(I) = \exp^{-|(\nabla * G)(I)|} \]

where $ I $ is image intensity and $ (\nabla * G) $ is the derivative of Gaussian operator.

The edge potential image is set via the SetFeatureImage() method.

In this function both the propagation term $ P(\mathbf{x}) $ and the curvature spatial modifier term $ Z(\mathbf{x}) $ are taken directly from the edge potential image such that:

\[ P(\mathbf{x}) = g(\mathbf{x}) \]

\[ Z(\mathbf{x}) = g(\mathbf{x}) \]

An advection term $ \mathbf{A}(\mathbf{x}) $ is constructed from the negative gradient of the edge potential image.

\[ \mathbf{A}(\mathbf{x}) = -\nabla g(\mathbf{x}) \]

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 77 of file itkGeodesicActiveContourLevelSetFunction.h.


Member Typedef Documentation

template<class TImageType , class TFeatureImageType = TImageType>
typedef SmartPointer< const Self > itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::ConstPointer
template<class TImageType , class TFeatureImageType = TImageType>
typedef TFeatureImageType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::FeatureImageType
template<class TImageType , class TFeatureImageType = TImageType>
typedef Superclass::FeatureScalarType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::FeatureScalarType
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 101 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType , class TFeatureImageType = TImageType>
typedef Superclass::GlobalDataStruct itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::GlobalDataStruct
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 93 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 97 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType , class TFeatureImageType = TImageType>
typedef SmartPointer< Self > itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::Pointer
template<class TImageType , class TFeatureImageType = TImageType>
typedef Superclass::RadiusType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::RadiusType
template<class TImageType , class TFeatureImageType = TImageType>
typedef Superclass::ScalarValueType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::ScalarValueType
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 82 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType , class TFeatureImageType = TImageType>
typedef SegmentationLevelSetFunction< TImageType, TFeatureImageType > itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::Superclass
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 102 of file itkGeodesicActiveContourLevelSetFunction.h.


Constructor & Destructor Documentation

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

Definition at line 140 of file itkGeodesicActiveContourLevelSetFunction.h.

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

Definition at line 149 of file itkGeodesicActiveContourLevelSetFunction.h.

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

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::itk::LightObject::Pointer itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::CreateAnother ( void  ) const [virtual]

Create an object from an instance, potentially deferring to a factory. This method allows you to create an instance of an object that is exactly the same type as the referring object. This is useful in cases where an object has been cast back to a base class.

Reimplemented from itk::LevelSetFunction< TImageType >.

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

The curvature speed is same as the propagation speed.

Reimplemented from itk::LevelSetFunction< TImageType >.

Definition at line 116 of file itkGeodesicActiveContourLevelSetFunction.h.

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 126 of file itkGeodesicActiveContourLevelSetFunction.h.

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

Run-time type information (and related methods)

Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.

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 130 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType , class TFeatureImageType = TImageType>
static 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]

Laplacean smoothing term

Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.

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 156 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 124 of file itkGeodesicActiveContourLevelSetFunction.h.


Member Data Documentation

template<class TImageType , class TFeatureImageType = TImageType>
const unsigned int itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::ImageDimension = Superclass::ImageDimension [static]

Extract some parameters from the superclass.

Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.

Definition at line 107 of file itkGeodesicActiveContourLevelSetFunction.h.

template<class TImageType , class TFeatureImageType = TImageType>
double itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::m_DerivativeSigma [private]

Definition at line 163 of file itkGeodesicActiveContourLevelSetFunction.h.


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