[Insight-users] Snake?, Yes

[Luis Ibanez]

Hi Waltraud,

There are several flavors of active contours in ITK.

1) The  first is the traditional expanding Mesh
    controled by a force with a constant component
    and an image derived component.

This approach is implemented by Dr.Metaxas group
in the classes:

http://www.itk.org/Insight/Doxygen/html/classitk_1_1DeformableMeshFilter.html
http://www.itk.org/Insight/Doxygen/html/classitk_1_1DeformableMesh3DFilter.html


2) The second approach is based on Level Sets.
    The surface is represented as the level set
    of a function in a higher dimensional space.

The evolution of the function under differential
equations determines the evolution of the embebded
surface. This is implemented in the GeodesicActiveContour
class:

http://www.itk.org/Insight/Doxygen/html/classitk_1_1GeodesicActiveContourImageFilter.html


3)  Similar effects can be obtained in general with
     level sets approached. You may want to consider the
     ThresholdSegmentation filter:
 
http://www.itk.org/Insight/Doxygen/html/classitk_1_1ThresholdSegmentationLevelSetImageFilter.html

and the LaplacianSegmentation filter:

http://www.itk.org/Insight/Doxygen/html/classitk_1_1LaplacianSegmentationLevelSetImageFilter.html


Please let us know if you have any question about
the use of these classes.



Thanks


    Luis



===========================================
Waltraud Henrich wrote:
> 
> Dear users, 
> 
> I am new to ITK and  I have a question . Is there something to program in
> ITK around Active Contour Models (or snakes) ? 
> 
> thank for the help. 
> 
> Waltraut.
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>