Title :
AMISP: a complete content-based MPEG-2 error-resilient scheme
Author :
Frossard, Pascal ; Verscheure, Olivier
Author_Institution :
Signal Process. Lab., Swiss Federal Inst. of Technol., Lausanne, Switzerland
fDate :
9/1/2001 12:00:00 AM
Abstract :
We address a new error-resilient scheme for broadcast quality MPEG-2 video streams to be transmitted over lossy packet networks. A new scene-complexity adaptive mechanism, namely Adaptive MPEG-2 Information Structuring (AMIS) is introduced. AMIS modulates the number of resynchronization points (i.e., slice headers and intra-coded macroblocks) in order to maximize the perceived video quality, assuming that the encoder is aware of the underlying packetization scheme, the packet loss probability (PLR), and the error-concealment technique implemented at the decoding side. The end-to-end video quality depends both on the encoding quality and the degradation due to data loss. Therefore, AMIS constantly determines the best compromise between the rate allocated to encode pure video information and the rate aiming at reducing the sensitivity to packet loss. Experimental results show that AMIS dramatically outperforms existing structuring techniques, thanks to its efficient adaptivity. We then extend AMIS with a forward-error-correction (FEC)-based protection algorithm to become AMISP. AMISP triggers the insertion of FEC packets in the MPEG-2 video packet stream. Finally, the performances of the AMISP scheme in an MPEG-2 over RTP/UDP/IP scenario are evaluated
Keywords :
adaptive codes; forward error correction; packet switching; quality of service; synchronisation; video coding; AMIS; AMISP; Adaptive MPEG-2 Information Structuring; FEC packets; FEC-based protection algorithm; MPEG-2 video packet stream; RTP/UDP/IP scenario; broadcast quality MPEG-2 video streams; content-based MPEG-2 error-resilient scheme; data loss; encoding quality; error-concealment technique; error-resilient scheme; forward-error-correction-based protection algorithm; intra-coded macroblocks; lossy packet networks; packet loss probability; perceived video quality; resynchronization point; scene-complexity adaptive mechanism; sensitivity; slice headers; structuring techniques; video information; Ambient intelligence; Broadcasting; Decoding; Degradation; Encoding; Forward error correction; Multimedia communication; Propagation losses; Protection; Streaming media;
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on