On Wed 02-Dec-2009 at 08:16 -0800, Rick Workman wrote:
>
>P.S. Are all the generators, including align_image stack, subject to
>patent restrictions?

As far as we know there are patents on SIFT and SURF.  

align_image_stack isn't effected, but it isn't an all-purpose 
control-point generator.

-- 
Bruno

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