[Insight-users] Masks with Multiresolution Registration

[Luis Ibanez]

Hi Sean,

It is actually quite simple:

    Just specify the mask at *any* resolution you want, and
    connect it to the metric, via the ImageMaskSpatialObject.

You won't need to provide masks for every intermetiate resolution
level, because masks are used to probe physical points, not to
select pixel through indices. Therefore, any mask resolution will
do fine.  You probably want to use the mask that corresponds to
the highest resolution of the pyramid.


    Regards,


       Luis


----------------------
Sean Ziegeler wrote:
> 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
> 
> 
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