A theoretical frame work for rate-constrainedmotion estimation is introduced. The best trade- off between displacementvector rate and prediction error rate is shown to bethe point were the partial derivatives of the multivariate distortionrate function are equal. Low bit-rate coders are severely rate-constrained,and coarser motion compensation is appropriate for lower bit- rates.A new region-based motion estimator builds a tree of nestedregions from back to front, where each region is encodedby a closed B-spline contour. The rate-constraint is a naturaltermination criterion when building the region tree. Experimental results showthat rate- constrained motion compensation is superior to a full-searchblock matching scheme when incorporated into a motion-compensating hybrid codingscheme, yielding up to 3 dB SNR improvement at 15kbps. ©2005 COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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