A new multiple description layered coding method over ad-hoc network

摘要

A new combined multiple description and layered coding method based on adaptive frame insertion (AFl-MDLC) for transmission of video bit stream over wireless ad-hoc network is proposed in this paper. The main idea of the method is to adaptively insert the transition frames according to the relative motion between two neighboring frames, and then divide the video sequence into two descriptions with independent prediction loops. Afterwards, the base layer and the enhancement layer bit stream for each description are generated and transmitted across wireless network, which is modeled with finite state Markov process. A multiple-path transmitting strategy is presented for the AFI-MDLC data packets according to the characteristics of ad hoc multi-hop wireless network. The experimental results show that the method can help the decoder recover from packet loss more quickly as compared with the previous methods, and provides more stable and better quality for the reconstruction of video sequence.