Coordinate overlap in two labelled images

[Stuart Mumford]

Hello,

I have a problem I was hoping someone here would be able to help me with!

I am using your (amazingly fast) label image routines and regionprops to 
extract the coordinates of the regions in two images. I need to filter 
these objects out if they do not overlap in both the images, then renumber 
all the remaining regions. At the moment I am doing something unspeakable 
with nested loops and sets which is pretty damn slow; I was hoping someone 
here would have a really clever idea on how to solve this. Failing that 
does anyone know how I can find the number of coordinates (output from 
regionprops) that overlap in two numpy arrays?

Thanks a lot
Stuart
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