Layered Wyner-Ziv video coding for noisy channels

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Title: Layered Wyner-Ziv video coding for noisy channels
Author: Xu, Qian
Abstract: The growing popularity of video sensor networks and video celluar phones has generated the need for low -complexity and power -e & #64259 ;cient multimedia systems that can handle multiple video input and output streams . While standard video coding techniques fail to satisfy these requirements , distributed source coding is a promising technique for ? ?uplink ? ? applications . Wyner -Ziv coding refers to lossy source coding with side information at the decoder . Based on recent theoretical result on successive Wyner -Ziv coding , we propose in this thesis a practical layered Wyner -Ziv video codec using the DCT , nested scalar quantizer , and irregular LDPC code based Slepian -Wolf coding (or lossless source coding with side information ) for noiseless channel . The DCT is applied as an approximation to the conditional KLT , which makes the components of the transformed block conditionally independent given the side information . NSQ is a binning scheme that facilitates layered bit -plane coding of the bin indices while reducing the bit rate . LDPC code based Slepian -Wolf coding exploits the correlation between the quantized version of the source and the side information to achieve further compression . Di & #64256 ;erent from previous works , an attractive feature of our proposed system is that video encoding is done only once but decoding allowed at many lower bit rates without quality loss . For Wyner -Ziv coding over discrete noisy channels , we present a Wyner -Ziv video codec using IRA codes for Slepian -Wolf coding based on the idea of two equivalent channels . For video streaming applications where the channel is packet based , we apply unequal error protection scheme to the embedded Wyner -Ziv coded video stream to & #64257 ;nd the optimal source -channel coding trade -o & #64256 ; for a target transmission rate over packet erasure channel .
URI: http : / /hdl .handle .net /1969 .1 /2797
Date: 2005-11-01


Layered Wyner-Ziv video coding for noisy channels. Available electronically from http : / /hdl .handle .net /1969 .1 /2797 .

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