JVET-AC0239 Non-EE2: Prediction of MVD magnitude suffix bins [A. Filippov, V. Rufitskiy, K. Suverov (Ofinno)] [late]

This contribution presents a technique for predicting MVD magnitude suffix bins. In fact, we proposed a technique that is an extension of MVD sign prediction, which is a part of ECM-7.0. In this design, not just signs but also magnitude suffix bins of exponential Golomb code are predicted by estimating template matching cost of candidate blocks to take advantage of regular CABAC mode rather than its by-pass mode at the entropy coding stage. On top of ECM-7.0, the following BD-rate gain results are reportedly obtained for Test 1, where a maximum of 6 bins (including sign bins) are predicted for blocks with width and height larger than 4 (affine motion compensation is enabled for these block sizes), and maximum of 2 bins are predicted for blocks that have either width or height equal to 4 (affine motion compensation is disabled for these block sizes) {-0.05%, -0.00%, -0.01%} for RA configuration and {-0.08%, 0.02%, -0.03%} for LDB configuration. On top of ECM-7.0, the following BD-rate gain results are reportedly obtained for Test 2, where a maximum of 6 bins (including sign bins) are predicted for blocks with width and height larger than 4 (affine motion compensation is enabled for these block sizes), and maximum of 4 bins are predicted for blocks that have either width or height equal to 4 (affine motion compensation is disabled for these block sizes) {-0.08%, -0.02%, -0.04%} for RA configuration and {-0.11%, -0.06%, -0.06%} for LDB configuration.

This has a reasonable tradeoff, and it seems unlikely that the gain will disappear due to new adoptions.

It was agreed to study this in an EE.