[Insight-users] Geodesic Active Contour and narrowbanding

[Joshua Cates]

Hi,

By the way, I will check in changes to the ITK CVS repository soon to 
allow swapping of solver types at run-time for any filter inheriting from
SegentationLevelSetImageFilter.  When these changes are made, there will 
be no need to create separate subclasses for each solver type.  Just a few 
more tests are needed before committing these changes...

Josh.

______________________________
 Josh Cates			
 Scientific Computing and Imaging Institute
 University of Utah
 (801) 587-7697
 http://www.sci.utah.edu/~cates


On Fri, 12 Mar 2004, Raul San Jose Estepar wrote:

> Hi Anders,
> 
> The GeodesicActiveContourLevelSetImageFilter is using a SparseField 
> solver. This solver can be seen as a more specialized narrowband solver.
> If you want to know more detail about how this solver works you could read
> Whitaker, Ross. A Level-Set Approach to 3D Reconstruction from Range 
> Data. International Journal of Computer Vision. V. 29 No. 3, 203-231.
> 1998.
> 
> Under the finite difference framework, you can find three kind of solvers:
> 1. DenseField
> 2. SparseField
> 3. NarrowBand
> 
> If you are interested in a standard NarrowBand solver you should try the 
> classes under NarrowBandImageFilterBase. A filter you may want to try is 
> itkNarrowBandCurvesImageFilter.
> Curves use an evolution equation similar to GeodesicActiveContour but 
> using minimal curvature instead of mean curvature. You can switch 
> between mean and minimal curvature setting up the appropriate variable.
> 
> If you are interested in building up a 
> NarrowBandGeodesicActiveContourLevelSetImageFilter you could take as 
> template itkNarrowBandCurvesImageFilter. Basically you have to inherit 
> from NarrowBandLevelSetImageFilter and plug the plug the levelset 
> equation you want to use, in this case, 
> GeodesicActiveContourLevelSetFunction.
> 
> 
> /Raul
> 
> Date: Tue, 9 Mar 2004 10:35:58 -0700 (MST)
> From: Joshua Cates <cates at sci.utah.edu>
> To: Anders =?iso-8859-1?b?QWxt5XM=?= <andersal at stud.ntnu.no>
> Cc: insight-users at itk.org
> Subject: Re: [Insight-users] Geodesic Active Contour and narrowbanding
> 
> Hi Anders,
> 
> The GeodesicActiveContourLevelSet filter automatically uses a
> narrowbanding solver.  No changes are necessary to get this functionality.
> 
> Josh.
> 
> 
> On Tue, 9 Mar 2004, Anders Alm=E5s wrote:
> 
> 
> >> Hi!
> >> =20
> >> I am using the itkGeodesicActiveContourLevelSet image filter. And I
> >> wonder if there is possible to use narrowbanding together with that
> >> filter? I saw in the applications-section in the ITK pages that it was
> >> included in the pipeline. But I am not able to do it in my own
> >> application.=20
> >> =20
> >> Anders
> >> =20
> >> =20
> >> _______________________________________________
> >> Insight-users mailing list
> >> Insight-users at itk.org
> >> http://www.itk.org/mailman/listinfo/insight-users
> >> =20
> >
> >  
> >
> 
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