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

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

#include <itkShapeDetectionLevelSetFunction.h>

Inheritance diagram for itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >:

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Collaboration diagram for itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >:

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List of all members.

Public Types

typedef ShapeDetectionLevelSetFunction Self
typedef SegmentationLevelSetFunction<
TImageType, TFeatureImageType > 		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::GlobalDataStruct GlobalDataStruct

Public Member Functions

virtual const char * GetClassName () const
 itkStaticConstMacro (ImageDimension, unsigned int, Superclass::ImageDimension)
virtual void CalculateSpeedImage ()
virtual ScalarValueType CurvatureSpeed (const NeighborhoodType &neighborhood, const FloatOffsetType &offset, GlobalDataStruct *gd) const
virtual void Initialize (const RadiusType &r)

Static Public Member Functions

Pointer New ()

Protected Member Functions

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

Detailed Description

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

This function is used in the ShapeDetectionLevelSetImageFilter 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.
ShapeDetectionLevelSetFunction 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 image 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:

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

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

Note that there is no advection term in this function.

This implementation is based on: "Shape Modeling with Front Propagation: A Level Set Approach", R. Malladi, J. A. Sethian and B. C. Vermuri. IEEE Trans. on Pattern Analysis and Machine Intelligence, Vol 17, No. 2, pp 158-174, February 1995

See also:
LevelSetFunction

SegmentationLevelSetImageFunction

ShapeDetectionLevelSetImageFilter

Definition at line 70 of file itkShapeDetectionLevelSetFunction.h.

Member Typedef Documentation

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

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

Definition at line 78 of file itkShapeDetectionLevelSetFunction.h.

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

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

Definition at line 79 of file itkShapeDetectionLevelSetFunction.h.

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

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

Definition at line 91 of file itkShapeDetectionLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType>
typedef Superclass::FloatOffsetType itk::ShapeDetectionLevelSetFunction< 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 93 of file itkShapeDetectionLevelSetFunction.h.

Referenced by itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::CurvatureSpeed().

template<class TImageType, class TFeatureImageType = TImageType>
typedef Superclass::GlobalDataStruct itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::GlobalDataStruct
 

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

Definition at line 94 of file itkShapeDetectionLevelSetFunction.h.

Referenced by itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::CurvatureSpeed().

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

Extract some parameters from the superclass.

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

Definition at line 88 of file itkShapeDetectionLevelSetFunction.h.

template<class TImageType, class TFeatureImageType = TImageType>
typedef Superclass::NeighborhoodType itk::ShapeDetectionLevelSetFunction< 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 89 of file itkShapeDetectionLevelSetFunction.h.

Referenced by itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::CurvatureSpeed().

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

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

Definition at line 77 of file itkShapeDetectionLevelSetFunction.h.

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

Neighborhood radius type

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

Definition at line 92 of file itkShapeDetectionLevelSetFunction.h.

Referenced by itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::Initialize().

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

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

Definition at line 90 of file itkShapeDetectionLevelSetFunction.h.

Referenced by itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::CurvatureSpeed().

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

Standard class typedefs.

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

Definition at line 75 of file itkShapeDetectionLevelSetFunction.h.

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

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

Definition at line 76 of file itkShapeDetectionLevelSetFunction.h.

Constructor & Destructor Documentation

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

Definition at line 117 of file itkShapeDetectionLevelSetFunction.h.

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

Definition at line 123 of file itkShapeDetectionLevelSetFunction.h.

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

Member Function Documentation

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

This method must be defined in a subclass to implement a working function object. This method is called before the solver begins its work to produce the speed image used as the level set function's Propagation speed term. See LevelSetFunction for more information.

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

template<class TImageType, class TFeatureImageType = TImageType>
virtual ScalarValueType itk::ShapeDetectionLevelSetFunction< 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 103 of file itkShapeDetectionLevelSetFunction.h.

References itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::FloatOffsetType, itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::GlobalDataStruct, itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::NeighborhoodType, and itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::ScalarValueType.

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

Run-time type information (and related methods)

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

template<class TImageType, class TFeatureImageType = TImageType>
virtual void itk::ShapeDetectionLevelSetFunction< 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 107 of file itkShapeDetectionLevelSetFunction.h.

References itk::ShapeDetectionLevelSetFunction< TImageType, TFeatureImageType >::RadiusType.

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

Method for creation through the object factory.

Reimplemented from itk::LevelSetFunction< TImageType >.

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

Reimplemented from itk::LevelSetFunction< TImageType >.

template<class TImageType, class TFeatureImageType = TImageType>
void itk::ShapeDetectionLevelSetFunction< 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 128 of file itkShapeDetectionLevelSetFunction.h.

References HardConnectedComponentImageFilter::PrintSelf().

The documentation for this class was generated from the following file:
Generated at Sun Apr 1 02:51:26 2007 for ITK by doxygen 1.3.8 written by Dimitri van Heesch, © 1997-2000