[Insight-users] Using Gradient information to define Region of Interest.

[mayuri Narayan]

Hello everyone,
Following up on my previous posting, I figured out that I could use gradient information to 
mark my region of interest. For instance, if my region of interest is only made up of semicircular/ elliptical / circular regions, I can make use of gradient information to
define my region of interest (using GradientMagnitudeImageFilter). 
     How could I possibly use this information to 
 
1. Decide which pixels lie on which side of the gradient?
 
2. Set all the pixels lying outside this region of interest to a particular value? Please help.
 
Thanks,
Mayuri

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