A system and method that processes video to extract a keyframe-based adequate visual representation. The method utilizes a hierarchical processing technique. The first stage in the hierarchy extracts a chromatic difference metric from a pair of video frames. An initial set of frames is chosen based on...http://www.google.com.au/patents/US20010003468?utm_source=gb-gplus-sharePatent US20010003468 - Method for detecting scene changes in a digital video stream
