Determining if objects are in two different images

Hi there,

I was wondering if there was a matlab function that could do the following:

Say I have 2 images in binary (A and B). I want to determine what objects are in both images A and B. However the objects that are in both A and B may or may not look the same/be the same size. As long as I have a pixel at B(x,y) = 1 and a pixel at A(x,y) = 1 then I would want to keep the entire object that pixel A(x,y) is a part of in A. Is there a function that can do this in matlab?

Thank in advance,

Jon