Removing objects in bw scene that have not appeared in the previous bw scene

Hi I have a set of binary images that detect moving vehicles. My data is very noisy and sometimes these noise regions leak into the foreground. These noise regions can be larger than the moving vehicles, and therefore, something like 'regionprops' might not work. How can I put a constraint to remove those regions in the current bw image that did not appear in the previous bw image. Something like using regionprops Centroids to do this check with. Thanks!

Answer 1

[Sean de Wolski]

Could you use a logical xor(). I.e. exclusively in one frame and not the other?

[Matlab_user]

I'm not sure if I understood what you suggested. The xor will probably not work as it will erode the edges of actual foreground objects.