Improved error detection and localization techniques for MPEG-4 video

A modified video codec for MBMS applications

“…URRENT research on Video Compression algorithms focus on optimizing the compression efficiency [1]. Research in the area of error resilience of compressed video streams target errors over the air or network [2] and do not take into account the resource constraints of devices. A resource constrained mobile device may have to drop video frames prior to decoding, thus resulting in error propagation due to the use of incorrect reference frames.…”

“…The predictive coding techniques used in MPEG video create frame dependencies that result in propagation of any errors that are a direct result of losses in the network or frame dropping at the receiver. H.263+ specifies a reference picture selection (RPS) mode where a past frame is referenced at the encoder for prediction if decoder reference frame is distorted [2]. However, such a technique requires feedback from the decoder channel that is not available in broadcast or multicast applications.…”