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 PSNR performance

MA-FGS: Structure Mode-Adaptive FGS Architecture

MA-FGS : Symbols

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

UEP for FGSk

mm lllllll ... ),,...,,( 2121

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

End to end Distortion Distortion of I-FGS

End to end Distortion (cont.) Distortion of P-FGS

End to end Distortion (cont.) Final formulation

R-D Extraction R-D Extraction of FGS Source Coding

jj

jjj

jjji

BikB

BikBB

d

1

11

11

e wher

),(

Experimental Result Bitrate and PSNR

Experimental Result Error Rate and PSNR

Conclusion This paper proposed a MA-FGS system

structure, and perform experiments to illustrate the effectiveness

It has derived an overall end-to-end R-D function for the proposed system