JVET-Q0497 Simplification of Rice parameter derivation for RRC [H.-J. Jhu, X. Xiu, Y.-W. Chen, T.-C. Ma, X. Wang (Kwai Inc.)]
In residual coding of a transform block, for each coefficient, the remaining absolute level is binarized using Golomb-Rice code whose rice parameter is adaptively derived depending on the neighbour coefficient levels and a lookup table. This contribution proposes two methods for deriving the rice parameters without using lookup table. The proposed method 1 reportedly provides 0.01%, 0.00%, and 0.00% luma BD-rate impact for the AI, RA, and LB settings respectively versus the VTM-7.0 anchor under the common test condition (CTC), and proposed method 2 reportedly provides 0.01%, -0.01%, and 0.01% luma BD-rate impact for the AI, RA, and LB settings respectively versus the VTM-7.0 anchor under the common test condition (CTC).
This is very similar to JVET-Q0490 and JVET-Q0263.
There was no obvious benefit of such change.