EFFICIENT MULTIRESOLUTION MULTI-STREAM VIDEO SYSTEMS WITH STANDARD CODECS

The availability of international standards based video codecs for ine xpensive platforms is reducing the cost of desk-top video systems to a level which makes their wide deployment possible. The current systems , however, are tuned for processing a single video stream only and the ir use in multiple video applications, such as continuous presence vid eo teleconferencing and digital picture-in-picture, is difficult and i nefficient. In this paper, we discuss two systems for efficient genera tion and display of multi-resolution, multiple compressed video materi al. Based on simple additions to standard coders, both systems are cap able of generating multiple bit streams corresponding to different res olutions of a single video source and they can decode such streams fro m multiple sources and display the resulting video sequences simultane ously. Both systems provide multiple video functionality to standard c odecs with almost no extra memory or processing power requirements. Al so, they make it possible for the users to customize the placement and size of their video windows, just as text and graphics windows can be manipulated.