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Hierarchical coding of a video signal over an ATM network

This paper describes a video scheme which is capable of compensating for the information losses due to packet loss. Packet losses in ATM (asynchronous transfer mode) networks have such a great impact on the design of coding algorithms and network architectures that they should be exhaustively discussed and resolved. One solution to this problem is the transmission of the video signal over the network with different levels of protection. The information which is considered sufficient to generating the minimum acceptable quality in a video signal is transmitted in a very protected way. On the contrary, other parts of the information necessary to increase the quality of the coded images up to the desired level are sent in a normal channel. In this paper a hierarchical approach is presented and its performances are compared with MPEG-2 system coding in the same circumstances.