Layered video communications in an ATM environment

The paper to address the issue of cell loss and its consequent effect on video quality in an H.261 framework, and possible compensative measures. Adaptive 2-layered coding, two-step detection, and a two-step recovery with macroblock-based error concealment are proposed to keep the picture quality high by compensating for cell loss. The simulation performance of the proposed system, which includes DCT-based layered coding with temporal error concealment, is compared with 1-layered and fixed 2-layered coding techniques. It is shown that good resilience and SNR improvement can be achieved even at quite high error rates by this system in particular for video sequences with high activity content