I can't help you at all, since I have zero expertise in this area, but I did
do a Google search for 

http://www.google.com/search?hl=en&q=tracking+blob+pixels+frame

and I found the links sufficiently fascinating to spend an entire hour
reading about stuff of no earthly use to me (but perhaps it will be of use
to you).


>  -----Original Message-----
>  The overall problem is tracking a marker on an animal from 
>  frames of a movie. As one can imagine, doing this on each 
>  frame is very time consuming. I've thought of using frame 
>  differences, but I'm not convinced it will buy much.


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