[Insight-users] Geodesic Active Contour and narrowbanding

[Raul San Jose Estepar]

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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