[Insight-users] Re : active contour, snake, deformable model and level set segmentation ???

[Juliette Deniau]

Hi Luis,
A one more question to clear completely my understanding.
You said that “The Level Set implementations of deformable models have all
the "LevelSet" string as part of their name” . Does this means that there is no 
level set (purely level set without active contour) based segmentation?
Thank you for your time
Juliette 
 



________________________________
De : Luis Ibanez <luis.ibanez at kitware.com>
À : Juliette Deniau <juliette.deniau at yahoo.fr>
Cc : insight-users at itk.org
Envoyé le : Mardi, 2 Décembre 2008, 21h04mn 06s
Objet : Re: [Insight-users] active contour, snake, deformable model and level set segmentation ???


Hi Juliette,


Your observations are correct.

If you are looking for a mesh-based implementation of a deformable model, then you should look at
http://www.itk.org/Insight/Doxygen/html/classitk_1_1DeformableSimplexMesh3DBalloonForceFilter.html


and its example application in

    InsightApplications/DeformableModelSimplexMesh


This is closer to what is known as "Snakes" in the medical field.

The Level Set implementations of deformable models have all
the "LevelSet" string as part of their name.


They will be:


$ find . -name "*LevelSetImageFilter.h"
./itkAnisotropicFourthOrderLevelSetImageFilter.h
./itkCannySegmentationLevelSetImageFilter.h
./itkCurvesLevelSetImageFilter.h
./itkGeodesicActiveContourLevelSetImageFilter.h
./itkGeodesicActiveContourShapePriorLevelSetImageFilter.h
./itkIsotropicFourthOrderLevelSetImageFilter.h
./itkLaplacianSegmentationLevelSetImageFilter.h
./itkNarrowBandCurvesLevelSetImageFilter.h
../itkNarrowBandLevelSetImageFilter.h
./itkNarrowBandThresholdSegmentationLevelSetImageFilter.h
./itkSegmentationLevelSetImageFilter.h
./itkShapeDetectionLevelSetImageFilter.h
./itkShapePriorSegmentationLevelSetImageFilter.h
./itkThresholdSegmentationLevelSetImageFilter.h
./itkUnsharpMaskLevelSetImageFilter.h
./itkVectorThresholdSegmentationLevelSetImageFilter..h



Please let us know if you have further questions,


    Thanks


      Luis



------------------------
Juliette Deniau wrote:
> Hi All,
> 
> I’m confused about what type of segmentation methods are within itk, in particular the ones related to active contour and level set?
> 
> In my understanding, active contour is the same as a deformable model and the same as a snake. The levelset segmentation is another type (use a PDE to evolve the curve).
> 
> In itk there are some active contours implemented with the level set framework like the CurvesLevelSetImageFilter, I’m alright?
> 
> Can any one tell me what are the segmentation filters which are purely active contour (snake) and those which use level set to evolve the curve?  
> Sorry if my question is too stupid!
> 
> Thanks a lot
> 
> Juliette
> 
> 
> 
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