Main Page   Groups   Namespace List   Class Hierarchy   Alphabetical List   Compound List   File List   Namespace Members   Compound Members   File Members   Concepts

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< TInputImage, TFeatureImage, TOutputPixelType >:

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

Collaboration graph
[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 Member Functions

virtual const char * GetClassName () const
float GetDerivativeSigma () const
void SetDerivativeSigma (float value)

Static Public Member Functions

Pointer New ()

Protected Member Functions

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

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:

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

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

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

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 $ \lambda_1 \times c $, the AdvectionScaling and CurvatureScaling both to $ \lambda_1 $ and the ShapePriorScaling to $ \lambda_2 $.

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.

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.

Referenced by itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::~GeodesicActiveContourShapePriorLevelSetImageFilter().

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.

Referenced by itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::~GeodesicActiveContourShapePriorLevelSetImageFilter().

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.

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 itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::GeodesicActiveContourFunctionPointer, and itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::Self.

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]
 

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.

The documentation for this class was generated from the following file:
Generated at Sun Apr 1 02:49:52 2007 for ITK by doxygen 1.3.8 written by Dimitri van Heesch, © 1997-2000