ITK  4.1.0
Insight Segmentation and Registration Toolkit
Public Types | Public Member Functions | Static Public Member Functions | Protected Member Functions | Private Attributes
itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType > Class Template Reference

#include <itkGeodesicActiveContourShapePriorLevelSetImageFilter.h>

+ Inheritance diagram for itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >:
+ Collaboration diagram for itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >:

List of all members.

Public Types

typedef SmartPointer< const SelfConstPointer
typedef
Superclass::FeatureImageType 
FeatureImageType
typedef
GeodesicActiveContourFunctionType::Pointer 
GeodesicActiveContourFunctionPointer
typedef
GeodesicActiveContourShapePriorLevelSetFunction
< OutputImageType,
FeatureImageType
GeodesicActiveContourFunctionType
typedef Superclass::OutputImageType OutputImageType
typedef Superclass::OutputPixelType OutputPixelType
typedef SmartPointer< SelfPointer
typedef
GeodesicActiveContourShapePriorLevelSetImageFilter 
Self
typedef
ShapePriorSegmentationLevelSetImageFilter
< TInputImage, TFeatureImage,
TOutputPixelType > 
Superclass
typedef Superclass::ValueType ValueType

Public Member Functions

virtual ::itk::LightObject::Pointer CreateAnother (void) const
virtual const char * GetNameOfClass () const
void SetDerivativeSigma (float value)

Static Public Member Functions

static Pointer New ()

Protected Member Functions

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

Private Attributes

GeodesicActiveContourFunctionPointer m_GeodesicActiveContourFunction
float GetDerivativeSigma () const
 ~GeodesicActiveContourShapePriorLevelSetImageFilter ()
 GeodesicActiveContourShapePriorLevelSetImageFilter ()

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 113 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
template<class TInputImage , class TFeatureImage , class TOutputPixelType = float>
typedef Superclass::FeatureImageType itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::FeatureImageType
template<class TInputImage , class TFeatureImage , class TOutputPixelType = float>
typedef GeodesicActiveContourFunctionType::Pointer itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::GeodesicActiveContourFunctionPointer
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 136 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

template<class TInputImage , class TFeatureImage , class TOutputPixelType = float>
typedef Superclass::OutputImageType itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::OutputImageType
template<class TInputImage , class TFeatureImage , class TOutputPixelType = float>
typedef Superclass::OutputPixelType itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::OutputPixelType
template<class TInputImage , class TFeatureImage , class TOutputPixelType = float>
typedef SmartPointer< Self > itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::Pointer
template<class TInputImage , class TFeatureImage , class TOutputPixelType = float>
typedef GeodesicActiveContourShapePriorLevelSetImageFilter itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::Self
template<class TInputImage , class TFeatureImage , class TOutputPixelType = float>
typedef ShapePriorSegmentationLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType > itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::Superclass
template<class TInputImage , class TFeatureImage , class TOutputPixelType = float>
typedef Superclass::ValueType itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::ValueType

Constructor & Destructor Documentation

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

Get the value of sigma used to compute the edge potential map derivatives.

Definition at line 164 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

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

Get the value of sigma used to compute the edge potential map derivatives.

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>
virtual::itk::LightObject::Pointer itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::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::SparseFieldLevelSetImageFilter< TInputImage, Image< TOutputPixelType,::itk::GetImageDimension< TInputImage >::ImageDimension > >.

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

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>
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 161 of file itkGeodesicActiveContourShapePriorLevelSetImageFilter.h.

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

Run-time type information (and related methods).

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

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

Flag to indicate whether Speed and Advection images are automatically generated when running the filter. Otherwise, a pointer to images must be explicitly set or GenerateSpeedImage() and/or GenerateAdvectionImage() called directly before updating the filter

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

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


Member Data Documentation

template<class TInputImage , class TFeatureImage , class TOutputPixelType = float>
GeodesicActiveContourFunctionPointer itk::GeodesicActiveContourShapePriorLevelSetImageFilter< TInputImage, TFeatureImage, TOutputPixelType >::m_GeodesicActiveContourFunction [private]

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