DocumentCode :
3782213
Title :
Modeling of layered video for low-bit-rate video conferencing applications
Author :
R.E. Parker;M. Tummala
Author_Institution :
Dept. of Electr. & Comput. Eng., Naval Postgraduate Sch., Monterey, CA, USA
Volume :
4
fYear :
1999
Firstpage :
267
Abstract :
Heterogeneous wireless networks present several challenges for real-time video applications. Traditional video codecs are not particularly robust and perform poorly when faced with packet losses from congestion and bit errors within the channel. A combination of deterministic traffic smoothing and layered video coding techniques improves error resilience. Smoothing over single frame intervals improves statistical multiplexing gains. To mitigate a portion of the delay introduced by smoothing, we propose a predictive smoother using the RLS algorithm that reduces the delay due to encoding. Layered video coding transmits video in scalable layers of increasing quality. We present a simple hybrid wavelet/DCT layered coder along with an associated optimized layered video traffic model. The traffic model employs a simplified multistate Markov chain representing a nonuniformly quantized pseudo-histogram of observed bit-rates for each layer. The model captures the effect of deterministic smoothing and aids in evaluating scheduling algorithms as well as providing a simple call acceptance scheme.
Keywords :
"Videoconference","Smoothing methods","Traffic control","Video coding","Delay","Wireless networks","Video codecs","Robustness","Telecommunication traffic","Resilience"
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 1999. ISCAS ´99. Proceedings of the 1999 IEEE International Symposium on
Print_ISBN :
0-7803-5471-0
Type :
conf
DOI :
10.1109/ISCAS.1999.779993
Filename :
779993
Link To Document :
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