Automate batch cropping/saving of multiple irregularly shaped images

[rtchow0]

I've got a couple hundred C-41 Kodak disc film color negatives of old
family photos that I'm trying to scan. Each one consists of plastic
central disc, with 15 small rectangular negatives arranged in a circle
around the central disc. You can see an example here:
http://www.oldfilmprocessing.com/images/OldFilms/DeskFilm-Processing.gif

I would like to scan the entire thing, then somehow use an automated
photoshop action to cut out all the individual images, rotate them,
and save them. Obviously, cutting each one manually can take 15-20
minutes per disc, which is an unacceptable amount of time given the
number of discs I have.

Anyone have any ideas how this might be accomplished?

Thanks!
Russell