JVET-K0529 CE3.3 related: Intra 67 modes coding with 3MPM [N. Choi, Y. Piao, K. Choi, C. Kim (Samsung)] [late]
This contribution was discussed Sat 1930 (chaired by GJS).
This contribution presents the performance and text of 67 intra mode coding when using 3MPM and a 6-bit fixed-length coding (FLC) for remaining modes which is similar to HEVC intra mode coding. 67 modes with 3MPM on BMS reportedly shows 0.6% loss in AI and 0.3% loss in RA. The AI encoding time was increased by 15%. (See below as JVET-K0545 regarding the encoding time.) Some of the tests had not been completed.
The 6 MPM scheme used for comparison does more RDO mode checking and has higher encoding complexity than the 3 MPM scheme as tested.
Additional testing was being done to check the performance of the 3 MPM scheme when the encoder search is checking more to be comparable to the encoder search used for the 6 MPM scheme.
This was further discussed Monday 1605 (GJS).
The tests described above had been completed. The estimated impact described above was confirmed. With an addition RD check in the encoder to equalize the search complexity, the coding loss was 0.5% in AI and 0.2% in RA relative to the 6 MPM scheme with truncated binarization. Decision: As recorded in section 11.2, the 3 MPM scheme will be used in VTM & draft 2.