Using JAI to compare images

Hi,

I am trying to write a short application which will take a
video...convert it to a series of images, and then compare the images
to detect motion. Now I know motion detection is not a trivial task,
but I am attempting the crude approach first.

I have figured out to to use JAI to convert the image to grayscale, but
I am not sure what I should use to compare the two PlanarImages. Should
I take the mean, the extrema? or maybe grab the histrogram of each and
use the entropy?

If someone could point me in the right direction, I'd appreciate it.
Thanks!

.

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