itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage > Class Template Reference

Segments structures in images based on a second derivative image features. More...

#include <itkLaplacianSegmentationLevelSetImageFilter.h>

Inheritance diagram for itk::LaplacianSegmentationLevelSetImageFilter:

[legend]Collaboration diagram for itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >:

[legend]List of all members.

Public Types
typedef LaplacianSegmentationLevelSetImageFilter	Self
typedef SegmentationLevelSetImageFilter< TInputImage, TOutputImage >	Superclass
typedef SmartPointer< Self >	Pointer
typedef SmartPointer< const Self >	ConstPointer
typedef Superclass::ValueType	ValueType
typedef LaplacianSegmentationLevelSetFunction< TOutputImage >	LaplacianFunctionType
Public Methods
virtual const char *	GetClassName () const
Static Public Methods
Pointer	New ()
Protected Methods
	~LaplacianSegmentationLevelSetImageFilter ()
	LaplacianSegmentationLevelSetImageFilter ()
virtual void	PrintSelf (std::ostream &os, Indent indent) const

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Detailed Description

template<class TInputImage, class TOutputImage>
class itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >

Segments structures in images based on a second derivative image features.

IMPORTANT

The SegmentationLevelSetImageFilter class and the LaplacianSegmentationLevelSetFunction class contain additional information necessary to the full understanding of how to use this filter.

OVERVIEW

This class is a level set method segmentation filter. It constructs a speed function which is zero at image edges as detected by a Laplacian filter. The evolving level set front will therefore tend to lock onto zero crossings in the image. The level set front moves fastest near edges.

The Laplacian segmentation filter is intended primarily as a tool for refining existing segmentations. The initial isosurface (as given in the seed input image) should ideally be very close to the segmentation boundary of interest. The idea is that a rough segmentation can be refined by allowing the isosurface to deform slightly to achieve a better fit to the edge features of an image. One example of such an application is to refine the output of a hand segmented image.

Because values in the Laplacian feature image will tend to be low except near edge features, this filter is not effective for segmenting large image regions from small seed surfaces.

INPUTS

This filter requires two inputs. The first input is a seed image. This seed image must contain an isosurface that you want to use as the seed for your segmentation. It can be a binary, graylevel, or floating point image. The only requirement is that it contain a closed isosurface that you will identify as the seed by setting the IsosurfaceValue parameter of the filter. For a binary image you will want to set your isosurface value halfway between your on and off values (i.e. for 0's and 1's, use an isosurface value of 0.5).

The second input is the feature image. This is the image from which the speed function will be calculated. For most applications, this is the image that you want to segment. The desired isosurface in your seed image should lie within the region of your feature image that you are trying to segment.

Note that this filter does no preprocessing of the feature image before thresholding. Because second derivative calculations are highly sensitive to noise, isotropic or anisotropic smoothing of the feature image can dramatically improve the results.

See SegmentationLevelSetImageFilter for more information on Inputs.

OUTPUTS

The filter outputs a single, scalar, real-valued image. Positive *values in the output image are inside the segmentated region and negative *values in the image are outside of the inside region. The zero crossings of *the image correspond to the position of the level set front.

See SparseFieldLevelSetImageFilter and SegmentationLevelSetImageFilter for more information.

PARAMETERS

This filter has no parameters other than those described in SegmentationLevelSetImageFilter.

See also:

SegmentationLevelSetImageFilter , LaplacianSegmentationLevelSetFunction, , SparseFieldLevelSetImageFilter

Definition at line 99 of file itkLaplacianSegmentationLevelSetImageFilter.h.

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Member Typedef Documentation

template<class TInputImage, class TOutputImage> typedef SmartPointer<const Self> itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::ConstPointer

Reimplemented from itk::SegmentationLevelSetImageFilter< TInputImage, TOutputImage >. Definition at line 107 of file itkLaplacianSegmentationLevelSetImageFilter.h.

template<class TInputImage, class TOutputImage> typedef LaplacianSegmentationLevelSetFunction<TOutputImage> itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::LaplacianFunctionType

Type of the segmentation function Definition at line 113 of file itkLaplacianSegmentationLevelSetImageFilter.h.

template<class TInputImage, class TOutputImage> typedef SmartPointer<Self> itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::Pointer

Reimplemented from itk::SegmentationLevelSetImageFilter< TInputImage, TOutputImage >. Definition at line 106 of file itkLaplacianSegmentationLevelSetImageFilter.h.

template<class TInputImage, class TOutputImage> typedef LaplacianSegmentationLevelSetImageFilter itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::Self

Standard class typedefs Reimplemented from itk::SegmentationLevelSetImageFilter< TInputImage, TOutputImage >. Definition at line 104 of file itkLaplacianSegmentationLevelSetImageFilter.h.

template<class TInputImage, class TOutputImage> typedef SegmentationLevelSetImageFilter<TInputImage, TOutputImage> itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::Superclass

Reimplemented from itk::SegmentationLevelSetImageFilter< TInputImage, TOutputImage >. Definition at line 105 of file itkLaplacianSegmentationLevelSetImageFilter.h.

template<class TInputImage, class TOutputImage> typedef Superclass::ValueType itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::ValueType

Inherited typedef from the superclass. Reimplemented from itk::SegmentationLevelSetImageFilter< TInputImage, TOutputImage >. Definition at line 110 of file itkLaplacianSegmentationLevelSetImageFilter.h.

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Constructor & Destructor Documentation

template<class TInputImage, class TOutputImage> itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::~LaplacianSegmentationLevelSetImageFilter (    )  [inline, protected]

Definition at line 122 of file itkLaplacianSegmentationLevelSetImageFilter.h.

template<class TInputImage, class TOutputImage> itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::LaplacianSegmentationLevelSetImageFilter (    )  [protected]

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Member Function Documentation

template<class TInputImage, class TOutputImage> virtual const char* itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::GetClassName (    )  const [virtual]

Run-time type information (and related methods). Reimplemented from itk::SegmentationLevelSetImageFilter< TInputImage, TOutputImage >.

template<class TInputImage, class TOutputImage> Pointer itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::New (    )  [static]

Method for creation through the object factory Reimplemented from itk::SparseFieldLevelSetImageFilter< TInputImage, TOutputImage >.

template<class TInputImage, class TOutputImage> virtual void itk::LaplacianSegmentationLevelSetImageFilter< TInputImage, TOutputImage >::PrintSelf (  std::ostream &    os, Indent    indent )  const [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::SegmentationLevelSetImageFilter< TInputImage, TOutputImage >.

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

• itkLaplacianSegmentationLevelSetImageFilter.h

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