[Insight-users] GeodesicActiveContourImageFilter

[Pui Yu Lau]

Hi,

    I'm a new user to ITK, and I've been trying to learn to use some of 
the segmentation filters.  I've been looking at the Geodesic Active 
Contour method, and I am confused on how it actually works.  Looking 
through the guide, it seems that it takes two initial image inputs, 
where the first one is the initial level set, and the second is the 
feature image.  However, when running the example of 
GeodesicActiveContourImageFilter, the images used were 
BrainProtonDensitySlice.png and 
GeodesicActiveContourImageFilterOutput.png, where the latter does not 
exist.  So, my question is, in this case, is the BrainProtonDensitySlice 
the feature image (input), while the 
GeodesicActiveContourImageFilterOutput is the initial level set 
(output)?  If not, what exactly is the initial level set image?

- PY