If the thumbs were really cut off (hard to tell from the slides), you should use the Python OpenCV hooks and center the thumbnail on the likeliest face. http:/

If the thumbs were really cut off (hard to tell from the slides), you should use the Python OpenCV hooks and center the thumbnail on the likeliest face. http://www.google.com/search?q=opencv+haar+cascade http://www.google.com/search?q=opencv+haar+cascade