A system and method for hypervideo object tracking in a compressed digital video environment includes a hypervideo authoring system and a hypervideo browser. The hypervideo authoring system permits one or more moving objects in an MPEG compressed video clip to be identified, tracked, refined,...http://www.google.de/patents/US6169573?utm_source=gb-gplus-sharePatent US6169573 - Hypervideo system and method with object tracking in a compressed digital video environment 
