Error concealment and early resynchronization techniques for MPEG-2 video streams damaged by transmission over ATM networks
Carlos Fernández, Andrea Basso, Jean‐Pierre Hubaux · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1996
In this paper we present some error concealment techniques for MPEG-2 video coded and multiplexed streams damaged by ATM cell losses. Decoder early resynchronization limits the effects of transmission errors by decoding some information that is normally discarded from the damaged MPEG-2 video bitstreams. A part of this information cannot be completely decoded due to its differential coding among macroblocks (DC levels, motion vectors). Three different techniques are presented for the case of DC level recovery in Intra pictures. Two of them are predictive techniques, one operating in the frequency domain and the other in the spatial domain. The third technique provides an exact reconstruction of DC values using special data coded into the user data area of the MPEG-2 video bitstream. For not resynchronized areas classical temporal and spatial concealment techniques are used. These techniques have been tested on a simulated environment which includes an implementation of MPEG-2 elementary video coding and decoding and MPEG-2 system standards. The ATM transmission part has been simulated by means of specialized simulation software. Results relative to the presented concealment techniques are included.