itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType > Class Template Reference
[Level Set-Based Segmentation Filters]

Segments structures in an image based on a user supplied edge potential map and user supplied shape model. More...

#include <itkGeodesicActiveContourShapePriorLevelSetImageFilter.h>

Inheritance diagram for itk::GeodesicActiveContourShapePriorLevelSetImageFilter:

[legend]Collaboration diagram for itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >:

[legend]List of all members.

Public Types
typedef GeodesicActiveContourShapePriorLevelSetImageFilter	Self
typedef ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >	Superclass
typedef SmartPointer< Self >	Pointer
typedef SmartPointer< const Self >	ConstPointer
typedef Superclass::ValueType	ValueType
typedef Superclass::OutputImageType	OutputImageType
typedef Superclass::FeatureImageType	FeatureImageType
typedef Superclass::OutputPixelType	OutputPixelType
typedef GeodesicActiveContourShapePriorLevelSetFunction< OutputImageType, FeatureImageType >	GeodesicActiveContourFunctionType
typedef GeodesicActiveContourFunctionType::Pointer	GeodesicActiveContourFunctionPointer
Public Methods
virtual const char *	GetClassName () const
float	GetDerivativeSigma () const
void	SetDerivativeSigma (float value)
Static Public Methods
Pointer	New ()
Protected Methods
	~GeodesicActiveContourShapePriorLevelSetImageFilter ()
	GeodesicActiveContourShapePriorLevelSetImageFilter ()
virtual void	PrintSelf (std::ostream &os, Indent indent) const
	GeodesicActiveContourShapePriorLevelSetImageFilter (const Self &)
void	operator= (const Self &)
void	GenerateData ()

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Detailed Description

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float>
class itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >

Segments structures in an image based on a user supplied edge potential map and user supplied shape model.

IMPORTANT

The SegmentationLevelSetImageFilter class, ShapePriorSegmentationLevelSetImageFilter class and the GeodesicActiveContourShapePrior0LevelSetFunction class contain additional information necessary to gain full understanding of how to use this filter.

OVERVIEW

This class is a level set method segmentation filter. An initial contour is propagated outwards (or inwards) until it ''sticks'' to the shape boundaries. This is done by using a level set speed function based on a user supplied edge potential map and a user supplied shape model.

INPUTS

This filter requires two inputs. The first input is a initial level set. The initial level set is a real image which contains the initial contour/surface as the zero level set. For example, a signed distance function from the initial contour/surface is typically used. Unlike the simpler ShapeDetectionLevelSetImageFilter the initial contour does not have to lie wholly within the shape to be segmented. The intiial contour is allow to overlap the shape boundary. The advection term in the update equation behaves like a doublet and attracts the contour to the boundary. The shape prior term adds robustness by incorporating aprior information about the shape to be segmented. This approach for segmentation follows that of Leventon et al (2000).

The second input is the feature image. For this filter, this is the edge potential map. General characteristics of an edge potential map is that it has values close to zero in regions near the edges and values close to one inside the shape itself. Typically, the edge potential map is compute from the image gradient, for example:

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

See SegmentationLevelSetImageFilter and SparseFieldLevelSetImageFilter for more information on Inputs.

PARAMETERS

The PropagationScaling parameter can be used to switch from propagation outwards (POSITIVE scaling parameter) versus propagating inwards (NEGATIVE scaling parameter).

This implementation allows the user to set the weights between the propagation, advection curvature and shape prior term using methods SetPropagationScaling(), SetAdvectionScaling(), SetCurvatureScaling() and SetShapePriorScaling. In general, the larger the CurvatureScaling, the smoother the resulting contour. To follow the implementation in Leventon et al paper, set the PropagationScaling to , the AdvectionScaling and CurvatureScaling both to and the ShapePriorScaling to .

OUTPUTS

The filter outputs a single, scalar, real-valued image. Negative values in the output image represent the inside of the segmented region and positive values in the image represent the outside of the segmented region. The zero crossings of the image correspond to the position of the propagating front.

See SparseFieldLevelSetImageFilter and SegmentationLevelSetImageFilter for more information.

REFERENCES

Leventon, M.E. et al. "Statistical Shape Influence in Geodesic Active Contours", CVPR 2000.

See also:

SegmentationLevelSetImageFilter , ShapePriorSegmentationLevelSetImageFilter , GeodesicActiveContourShapePriorLevelSetFunction , SparseFieldLevelSetImageFilter , ShapeSignedDistanceFunction

Definition at line 111 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

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Member Typedef Documentation

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef SmartPointer<const Self> itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::ConstPointer

Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >. Definition at line 121 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef Superclass::FeatureImageType itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::FeatureImageType

Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >. Definition at line 126 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef GeodesicActiveContourFunctionType::Pointer itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::GeodesicActiveContourFunctionPointer

Definition at line 134 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef GeodesicActiveContourShapePriorLevelSetFunction< OutputImageType, FeatureImageType > itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::GeodesicActiveContourFunctionType

Type of the segmentation function Definition at line 132 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef Superclass::OutputImageType itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::OutputImageType

Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >. Definition at line 125 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef Superclass::OutputPixelType itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::OutputPixelType

Type of the output pixel. Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >. Definition at line 127 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef SmartPointer<Self> itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::Pointer

Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >. Definition at line 120 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef GeodesicActiveContourShapePriorLevelSetImageFilter itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::Self

Standard class typedefs Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >. Definition at line 117 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType > itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::Superclass

Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >. Definition at line 119 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> typedef Superclass::ValueType itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::ValueType

Inherited typedef from the superclass. Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >. Definition at line 124 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

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Constructor & Destructor Documentation

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::~GeodesicActiveContourShapePriorLevelSetImageFilter (    )  [inline, protected]

Definition at line 160 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h. References HardConnectedComponentImageFilter::GenerateData(), and HardConnectedComponentImageFilter::PrintSelf().

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::GeodesicActiveContourShapePriorLevelSetImageFilter (    )  [protected]

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::GeodesicActiveContourShapePriorLevelSetImageFilter (  const Self &    )  [protected]

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Member Function Documentation

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> void itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::GenerateData (    )  [protected]

Overridden from Superclass to handle the case when PropagationScaling is zero and CurvatureScaling is non-zero. Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> virtual const char* itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::GetClassName (    )  const [virtual]

Run-time type information (and related methods). Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> float itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::GetDerivativeSigma (    )  const [inline]

Get the value of sigma used to compute the edge potential map derivatives. Definition at line 156 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> Pointer itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::New (    )  [static]

Method for creation through the object factory

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> void itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::operator= (  const Self &    )  [protected]

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> virtual void itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::PrintSelf (  std::ostream &    os, Indent    indent )  const [protected, virtual]

Reimplemented from itk::ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >.

template<class TInputImage, class TFeatureImage, class TOutputPixelType = float> void itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::SetDerivativeSigma (  float    value )  [inline]

Set the value of sigma used to compute the edge potential map derivatives Definition at line 145 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

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

• itkGeodesicActiveContourShapePriorLevelSetImageFilter.h

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