DocumentCode :
1491612
Title :
Error-propagation prevention technique for real-time video transmission over ATM networks
Author :
Wang, Jong-Tzy ; Chang, Pao-Chi
Author_Institution :
Dept. of Electr. Eng., Nat. Central Univ., Chung-Li, Taiwan
Volume :
9
Issue :
3
fYear :
1999
fDate :
4/1/1999 12:00:00 AM
Firstpage :
513
Lastpage :
523
Abstract :
Video sequences compressed by the current video-compression standards-such as MPEG 1/2 and H.261/H.263, which include motion compensation and variable-length coding-are very sensitive to channel disturbances. There exist many error-concealment techniques that can improve the video quality substantially. However, they generally do not prevent or terminate the error propagation. The forced intraupdate technique was proposed for H.245. In this paper, we present an efficient temporal error-propagation prevention method that implements the forced intraupdate concept implicitly. Once an error is detected at the decoder, the starting address of the erroneous macroblocks is sent back to the encoder. The encoder marks the possible damaged area, and the encoding process continues as normal except that the motion estimation will probably not refer to the erroneous part. Thus, the impact of the cell loss is limited to the erroneous slice only, and the damage from the error propagation is greatly reduced. Simulation results of MPEG-2 coding over asynchronous transfer mode (ATM) networks show that the error concealment with feedback can effectively isolate the error and reduce the damage to give satisfactory performance even when the cell-loss rate is higher than 1%. With the delay analysis of ATM networks, we also show that in most cases, the encoder has adequate time to get the feedback information before processing the next I- or P-frames
Keywords :
asynchronous transfer mode; code standards; data compression; delays; feedback; image sequences; telecommunication networks; telecommunication standards; variable length codes; video coding; visual communication; ATM networks; H.261; H.263; I-frames; MPEG-1; MPEG-2; P-frames; asynchronous transfer mode; cell-loss rate; channel disturbances; decoder; delay analysis; error-concealment techniques; feedback; forced intraupdate technique; motion compensation; motion estimation; real-time video transmission; simulation results; temporal error-propagation prevention; variable-length coding; video quality; video sequences; video-compression standards; Asynchronous transfer mode; Decoding; Delay effects; Feedback; Motion compensation; Motion estimation; Propagation losses; Transform coding; Video compression; Video sequences;
fLanguage :
English
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8215
Type :
jour
DOI :
10.1109/76.754780
Filename :
754780
Link To Document :
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