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Techniques for resynchronizing motion-compensation-based coders and strategies for the recovery of lost motion vectors are discussed. Leaky-difference resynchronization yields perceptually pleasing video sequences even at fairly high cell loss rates. Future study is needed to determine optimal data-dependent or network-state-dependent conditional resynchronization strategies. Lost motion vectors can be predicted accurately with either the median of intraframe neighboring vectors or the corresponding past-frame vector. The replacement of lost motion vectors with estimates such as these can significantly improve the quality of video affected by cell loss.>
Haskell et al. (Wed,) studied this question.