On motion compensation of wavelet coefficients

New intra- and inter-frame coding techniques for coding a wavelet decomposed video signal are proposed. These methods are based on the required accuracy of motion compensation for each of the different frequency subbands. For each subband, our methods prohibit inter-frame coding and switch to intra-frame coding when the estimated motion vector is not sufficiently accurate. The simple switching mechanism adopted results in a low overhead for coding the adaptation parameters while keeping the loss in coding gain negligible, compared to an unconstrained adaptive strategy in which intra- and inter-frame coding can be switched independently in each subband. The required accuracy of motion compensation is derived analytically for equally distributed pass-band signals and used throughout the paper. Simulation results for practical video sequences are presented