Gradient analysis may be utilized to determine frame and field repeat patterns in input video data. Those frame and field repeat patterns may then be analyzed to match them with characteristic patterns associated with telecine 3:2 and 2:2 pulldown video data, for example. In addition, a progressive detector...http://www.google.de/patents/US7982805?utm_source=gb-gplus-sharePatent US7982805 - Detecting video format information in a sequence of video pictures
