ITK
4.3.0
Insight Segmentation and Registration Toolkit
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#include <itkGeodesicActiveContourLevelSetFunction.h>
This function is used in GeodesicActiveContourLevelSetImageFilter to segment structures in an image based on a user supplied edge potential map.
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 , 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:
where is image intensity and is the derivative of Gaussian operator.
The edge potential image is set via the SetFeatureImage() method.
In this function both the propagation term and the curvature spatial modifier term are taken directly from the edge potential image such that:
An advection term is constructed from the negative gradient of the edge potential image.
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
Definition at line 77 of file itkGeodesicActiveContourLevelSetFunction.h.
Static Public Member Functions | |
static Pointer | New () |
Static Public Attributes | |
static const unsigned int | ImageDimension = Superclass::ImageDimension |
Static Public Attributes inherited from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType > | |
static const unsigned int | ImageDimension = Superclass::ImageDimension |
Static Public Attributes inherited from itk::LevelSetFunction< TImageType > | |
static const unsigned int | ImageDimension = Superclass::ImageDimension |
Static Public Attributes inherited from itk::FiniteDifferenceFunction< TImageType > | |
static const unsigned int | ImageDimension = ImageType::ImageDimension |
Private Attributes | |
double | m_DerivativeSigma |
Additional Inherited Members | |
Protected Types inherited from itk::LightObject | |
typedef int | InternalReferenceCountType |
Static Protected Member Functions inherited from itk::LevelSetFunction< TImageType > | |
static VectorType | InitializeZeroVectorConstant () |
Protected Attributes inherited from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType > | |
VectorImageType::Pointer | m_AdvectionImage |
FeatureImageType::ConstPointer | m_FeatureImage |
InterpolatorType::Pointer | m_Interpolator |
ImageType::Pointer | m_SpeedImage |
Functor::VectorCast< typename VectorInterpolatorType::OutputType, VectorType > | m_VectorCast |
VectorInterpolatorType::Pointer | m_VectorInterpolator |
Static Protected Attributes inherited from itk::LevelSetFunction< TImageType > | |
static double | m_DT |
static double | m_WaveDT |
static VectorType | m_ZeroVectorConstant |
typedef SmartPointer< const Self > itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::ConstPointer |
Definition at line 86 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef TFeatureImageType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::FeatureImageType |
Definition at line 87 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef Superclass::FeatureScalarType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::FeatureScalarType |
Definition at line 99 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef Superclass::FloatOffsetType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::FloatOffsetType |
Definition at line 101 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef Superclass::GlobalDataStruct itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::GlobalDataStruct |
Definition at line 103 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef Superclass::ImageType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::ImageType |
Extract some parameters from the superclass.
Definition at line 93 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef Superclass::NeighborhoodType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::NeighborhoodType |
Definition at line 97 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef SmartPointer< Self > itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::Pointer |
Definition at line 85 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef Superclass::RadiusType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::RadiusType |
Definition at line 100 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef Superclass::ScalarValueType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::ScalarValueType |
Definition at line 98 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef GeodesicActiveContourLevelSetFunction itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::Self |
Standard class typedefs.
Definition at line 82 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef SegmentationLevelSetFunction< TImageType, TFeatureImageType > itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::Superclass |
Definition at line 84 of file itkGeodesicActiveContourLevelSetFunction.h.
typedef Superclass::VectorImageType itk::GeodesicActiveContourLevelSetFunction< TImageType, TFeatureImageType >::VectorImageType |
Definition at line 102 of file itkGeodesicActiveContourLevelSetFunction.h.
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inlineprotected |
Definition at line 140 of file itkGeodesicActiveContourLevelSetFunction.h.
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inlineprotectedvirtual |
Definition at line 149 of file itkGeodesicActiveContourLevelSetFunction.h.
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protected |
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Compute the advection field from feature image.
Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.
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Compute speed image from feature image.
Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.
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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::LightObject.
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inlinevirtual |
The curvature speed is same as the propagation speed.
Reimplemented from itk::LevelSetFunction< TImageType >.
Definition at line 116 of file itkGeodesicActiveContourLevelSetFunction.h.
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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.
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Run-time type information (and related methods)
Reimplemented from itk::SegmentationLevelSetFunction< TImageType, TFeatureImageType >.
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inlinevirtual |
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.
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Method for creation through the object factory.
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protected |
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inlineprotectedvirtual |
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::FiniteDifferenceFunction< TImageType >.
Definition at line 156 of file itkGeodesicActiveContourLevelSetFunction.h.
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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.
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Extract some parameters from the superclass.
Definition at line 107 of file itkGeodesicActiveContourLevelSetFunction.h.
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Definition at line 163 of file itkGeodesicActiveContourLevelSetFunction.h.