Dynamic error concealment technique for the transmission of hierarchical encoded MPEG-2 video over ATM networks

In the process of transmission of digital-encoded video bitstreams over an ATM network, cells are inevitably exposed to delays and losses due to the dynamic resource allocation mechanisms used in these networks. Error-loss concealment schemes have been proposed to limit the impact of such impairments on the video quality. The results obtained by these algorithms very much depend on the characteristics of the video sequences being transmitted. We propose a dynamic algorithm allowing one to select the most suitable error-loss concealment scheme by taking into account the characteristics of the video sequence. Our results show the feasibility of developing algorithms that are able to dynamically select the best error-loss concealment schemes as well as the improvements in the image quality in the presence of losses.