Multiple Description Distributed Video Coding

In wireless video transmission, multiple description coding (MDC) is an effectiveway to enhance the error resilience over packet loss channels. Multiple descriptioncoding divides the information source into several descriptions, each of which istransmitted through an independent channel and have the ability to restore the wholeimage. Therefore, even if some descriptions are lost in the transmission, an acceptablequality can be achieved through other descriptions. While all the descriptions arereceived, a better quality can be yielded.Now multiple description video coding schemes are mostly based on multipleprediction loops and behave well in the ideal multiple description channel. However, Inthe wireless transmission, the channel packet loss will lead to difference between thereference frame in the encoder and the decoder, which will cause a drift problem. Thedrift propagates with time, and may cause a serious damage of the whole videosequence. Using distributed video coding to replace the traditional predictive coding,this paper proposed a novel feedback free multiple description distributed video codingto beat the drift problem, in which a cycle shift algorithm and extracting the regions ofinterest in bitplanes are used to produce balanced descriptions and remove the feedbackchannel in DVC scheme. Meanwhile a simple video motion estimation method isproposed to adjust the redundancy between the descriptions. Experimental results showthat the proposed MDDVC proves to be a promising multiple description codingscheme, removing the feedback channel, ensuring the robustness transmission andreal-time transmission.