Research Of Distributed Video Coding

At present ,as the core technologies of the digital video product and service, digital video compression has made massive progresses,many video compression international standards were proposed,but these standards are asymmetrical encoding methods, the encoder is composed of transformation,quantification,entropy code, dequantification,detransformation,as well as the motion estimation and compensation process.Therefore encoder has already included a decoder;this results in about 5 to 10 times high in complexity compared with decoder,which is suitable for server - client services,such as the digital video broadcast,services and video on demand. However,for the wireless video sensor network,which encoding on spot and transmitting to the central decoding node,the power loss,storage capacity and the band width and are restricted;But decoder has enough resources to carry on the complex operation:This is just the opposite with the traditional video coding scheme.As more and more requirements to the wireless video resolution and visual quality,how to provide highly efficient video coding in resource-limited system raised and become an urgent request. Distributed video coding will become one of the efficient paths to solve the above problems.The distributed video coding (DVC) proposed in the 1970s,establishes on the correlative source encoding theory's foundation , namely Slepian-Wolf and the Wyner-Ziv distributed code information theory principle,comparing with the traditional video coding techniques,it is brand-new in from principle to the realization method. it is based on the side information obtained on the decoder,this can reduce the encoder complexity,but shifts the massive operations to the decoder.Firstly this paper introduced basic principle of DVC scheme. Secondly,listed the development in recent years,reported the system diagram and achievements of several working teams in this field. Thirdly , introduce an simple implementation of DVC .Finally,forecast the trend of the DVC techniques.