| Abstract
Adaptive flow computation and DCT quantisation
play complementary roles in motion compensated video coding schemes.
Since the introduction of the intuitive entropy-constrained motion estimation
of Dufaux et al., several optimal Variable-Size Block Matching Algorithms
have been proposed. Many of these approaches put forward their intrinsic
optimality, but the corresponding visual effect has not been explored.
In this work, the relative importance of
optimal multigrid motion estimation with regard to quantisation is addressed
in the context of MPEG-like coding. It is shown that while simpler (suboptimal)
motion estimates give as good subjective results as the optimal ones, small
enhancements in the quantiser have significant visual effects.This suggests
that more attention should be paid to the quantiser design.
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