JVET-R0366 Simplified disLut for GPM [Y.-Z. Ma, Q.-H. Ran, R.-P. Qiu, H.-X. Wang, J.-Y. Huo, F.-Z. Yang (Xidian Univ), S. Wan (NPU), Y.-F. Yu, Y. Liu (OPPO)]
In VVC Draft 8, for CUs coded by geometric partitioning mode (GPM), a look-up table disLut is used for weight value derivation and motion vector storing type derivation. This contribution proposes to simplify the table disLut, by changing each value to half. With the proposed simplification, 1 bit could be saved for each value in the table and the intermediate variables, and the derivation of weight value and motion vector storing type keep mathematically equivalent at the same time.
The coding performance is identical with that of VTM8.0. The experimental results are as below:
For RA configuration: 0.00 %, 0.00%, and 0.00%.
For LB configuration: 0.00 %, 0.00%, and 0.00%.
This is purely editorial. A hardware implementation could anyway make this (as there are only even values in the table), whereas for software it may be more straightforward to use table as is.
No action was taken on this.