Hybrid cell loss concealment methods for MPEG-II-based packet video

摘要

This paper proposes two hybrid codec systems to encode MPEG-II-based packet video. Two-layer coding for ATM transmission has two primary disadvantages: (1) the total bit-rate is increased compared with one-layer coding at the same picture quality; (2) the cell loss caused by the network traffic needs to be dealt with. To reduce the total bit-rate and avoid error propagation, we develop two different layer coding schemes and concealment methods for intracoded macro blocks (MBs) and intercoded MBs. The first proposed system has better concealment for impaired area that makes it more tolerant to higher cell-loss ratio, whereas the second one generates lower bits, but it has the disadvantages of temporal error propagation. In the experiments, we compare our method with previous ones (Ghanbari and Seferidis, 1993; Wada, 1989; Lee et al., 1993; Zhu et al., 1993) and illustrate that our two-layer codec gives a lower bit-rate and produces better error concealment.