wireless fgs video transmission using adaptive mode selection and unequal error protection jianhua...
Post on 21-Dec-2015
216 views
TRANSCRIPT
Wireless FGS video transmission using adaptive mode selection and unequal error protection
Jianhua Wu and Jianfei CaiNanyang Technological University
Visual Communications and Image Processing 2004
Outline Introduction
MC-FGS Unequal Error Protection
Mode Adaptive FGS Architecture (MA-FGS) UEP for FGS End to End Distortion R-D Extraction of FGS coding Experimental Result Conclusion
Introduction Wireless video transmission becomes possible
and has received more and more attention Huge data size of digital video and limited
bandwidth of wireless channels Highly efficient video coding schemes and
severe error environment Video coding rate can be adaptively adjusted
Introduction (cont.) Scalable video coding is a common approach for
providing rate adaptation. The FGS enhancement layer bitstream can be tr
uncated at any position There is no prediction in the FGS enhancement l
ayer FGS is not fit the limited bandwidth of wireless n
etworks
FGS - Improvement MC-FGS
I B P B P
Error Propagation occurs while losing the referenced enhancement layer
Unequal Error Protection Using Error control techniques (FEC etc.) to tran
smit FGS bitstream over packet loss channels This paper jointly consider mode selection and U
DP for FGS video transmission over wireless channels With prediction or without prediction
MA-FGS I-FGS: an FGS enhancement layer frame coded
without prediction
P-FGS: with prediction Apply the motion vectors generated in the base layer
),(ˆ),(),(),( inXinYinFinG
),1(ˆ),(ˆ),(),( inFinXinYinG
Problem Formulation Let {0,1} be the mode decision for FGS
enhancement layer frame, where = 0 means I-FGS while = 1 means P-FGS D = DI + (1- )DP
Problem: Given a total bandwidth and channel symbol rate ,
how to choose and l to minimize the distortion
D = Ds + Dc
),( lD