At my work place, passport sized photographs are scanned together, then cut up into individual pictures and saved with unique file numbers. Currently we use Paint.net to manually select, cut and save the pictures.

I have seen Sony's Cybershot Camera has face detection. Google also gives me something about iphoto when searching for face detection. Picasa has facedetection too. Are there any ways to autodetect the faces in a document, which would improve productivity at my workplace by reducing the time needed to cut up individual images.

Sample Scanned Document(A real document has 5 rows of 4 images each=20 pics): (from: http://www.memorykeeperphoto.com/images/passport_photo.jpg, fairuse)

For eg. In Picasa 3.8, On clicking View> People, all the faces are shown and I am asked to name them, can I save these individual pictures automatically with the names as different pictures.