Automatically create multiple images from one scan

We sell many small items via online auctions, items that can be placed on a scanner. We need seperate images of each item. On the average size scanner we can fit about 30. We need a program to automatically recognize these items and create a seperate image file. It would need to be efficient as we could possibly scan thousands of items daily. We have tried using Photoshop's automated crop and straighten or Element's divide scanned images, but it almost always cuts part of an edge off of the scans. We would prefer a stand alone program, but could also entertain the idea of some sort of script added to Photoshop.