Research On Distributed Video Coding And Its Application In Joint Source Channel Coding

The traditional video coding standards, such as MPEG-X or the H.26X recommendations, mainly rely on the encoder to exploit the statistics of the source signal. So the encoder is typically 5 to 10 times more complex than the decoder. In recent years, the emerging applications, such as wireless sensor network, mobile camera phones, and wireless video surveillance systems breed challenge to the coding structure characterized by a significantly lower complex encoder and a higher complex video decoder. Distributed video coding(DVC)has a systematic structure opposite to traditional video coding standards. Compared to the traditional codec, a dramatic change is shifting the majority of complexity to the decoder. The major task of exploiting the statistics of the source signal is partially or wholly placed at the decoder. So the system with distributed video coding has characteristics of simply encoding, complicated decoding, efficiently compressing, good resistance to error and especially fitting for the JSCC system with strict power consumption.On the basis of studying DVC theory, an improved algorithm is proposed for the side information generating process so as to increase the PSNR at the decoder. Also the DVC theory is used in joint source channel coding system to encode the source signals, then the encoded bits are ordered according to the different importance and packeted, making the recovered image quality best when the decoder receives a number of data packets correctly.