[Insight-users] applying filters within a region

[Hari Sundar]

Hi,

I have a bunch of really huge images that I need to run some filters on.
This takes forever, understandably. Is there someway in which I can
restrict operation of the filter within a sub-region of the image. I would
prefer to do something like apply something like a threshold on the image
and apply other filters only within the thresholded region, i.e., by using
the threshold as a mask on the original image.

Is this possible ?

thanks,
-Hari