Prediction-Based Techniques

A good estimation of the lost blocks, can be provided by using the spatially corresponding blocks of the previous frame. This technique performs well at low-motion scenes. If the motion vectors for the lost blocks are received correctly, for example in MPEG2 concealment vectors mode, the results are much more improved by using the motion compensated blocks of the previous frame. This technique has been shown to work very well in conjunction with data partitioned layered coding, where the motion information is transmitted with the base layer.

Other techniques that exploit the spatial correlation, as well as the temporal in order to estimate the lost blocks, are the maximally smooth recovery techniques. Briefly, they apply spatiotemporal measures in the neighbourhood of the lost blocks, to obtain an estimation that minimises them, so that the resulting video signal is as smooth as possible.

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