Intra-Refreshing Algorithm of AVS-M Based on Rate-Distortion Optimization with Losses
Xiaojiu Fan · Journal of Tianjin University Science and Technology · 2008
The low bit-rate video stream compressed by motion-compensated hybrid codes such as AVS-M is vulnerable to error-prone networks.The errors caused by packet loss not only impair the reconstruction quality of current frame,but also lead to temporal and spatial error propagation to subsequent frames,which may result in visual dropping sharply.Models of rate-distortion optimization(RDO)with and without losses were analyzeda,nd the propagation distortion and concealment distortion of damaged macroblock(MB) were investigated.An intra-refreshing algorithm of AVS-M was realized based on RDO with losses by comparing values of Lagrangian cost function of MB in different coding modes.Meanwhiler,andom intra-refreshing and line refreshing algorithms were compared with the proposed algorithm.The experimental results show that superior performance of error resilient can be achieved using the proposed algorithm without increasing computational complexity remarkably.