Concealment of bit error and cell loss in inter-frame coded video transmission

Experimental results on error concealment techniques to hide the video quality degradation due to bit errors and cell losses from the viewer´s perception are presented. The impact of bit error and cell loss in a hybrid DPCM/DCT (differential pulse code modulation/discrete cosine transform) coding algorithm is described through three different video sequence simulations. Two effective schemes that conceal the information loss caused by bit errors and cell losses based on the information in the previous frame are presented. These error concealment techniques work very well in real-time playback as long as the location of bit error and cell loss is properly detected by the decoder. Impairments caused by a cell loss can be compensated for by simple replenishment in real-time playback. Although motion replenishment performs better in the case of uniformly slow motion, it requires that the network have a priority capability. Impairments due to undetected bit errors cannot be compensated for by any concealment algorithm