[Insight-users] Masks with Multiresolution Registration

[Sean Ziegeler]

I'd like to use a fixed & moving mask when doing multiresolution 
registration.  However, there isn't a straightforward way (that I can 
see) to specify the masks as an image pyramid in the same way that one 
would the input images.

I assume one must specify a reduced resolution version of the mask for 
each corresponding level?  If so, the only way I can see to do this is 
to use a command observer that executes before each level, obtain a 
pointer to the metric, shrink the mask with ShrinkImageFilter, and set 
the new mask.

Does that sound about right?

Thanks,
Sean