Organisation internationale de normalisation

Single depth mode (11)

(Chaired by JRO, Sat. afternoon)

13.0.1.1.1.1.1.1.31JCT3V-J0040 Simplification for single depth mode pruning process [S. Yoo, S. Yea (LGE)]

Single depth mode for depth intra coding is adopted at the last meeting. In the single depth mode process, up to five samples on the fixed position from the neighbor samples are compared with each other to remove the duplicated candidates. Once the candidates are pruned, the first two available samples are used and one of them is signaled with an index. However, for most cases, the first two samples are available and they are chosen if they are not same from each other. Therefore, it is proposed to compare only first two samples and make them as the candidate samples. The experimental result reportedly shows that there is no impact on the coding efficiency.

Coding is <0.1% for all sequences, on average 0.01.

13.0.1.1.1.1.1.1.32JCT3V-J0096 Cross-check on Simplification for single depth mode pruning process (JCT3V-J0040) [J. Zheng(HiSilicon)] [late]
13.0.1.1.1.1.1.1.33JCT3V-J0058 Simplification on candidate list construction for single depth mode [X.Chen, X.Zheng, Y.Lin, J.Zheng (HiSilicon)]

At the 9^th JCT-3V meeting, method of single depth intra coding was adopted in JCT3V-I0095 that is reconstructed by filling this CU with one single depth value when a CU is coded as single depth mode. The candidate list derivation process in JCT3V-I0095 is relatively high complex, as it needs to insert into the candidate list by analyzing up to five reconstructed spatial neighboring samples around the current CU in the order with pruning process. In this contribution, a low complex approach for candidate list construction is proposed. The impact on the coding efficiency of single depth intra coding is negligible.

Part 1: Check two candidates only, and add default candidate if they are identical, likely identical with J0040; almost no loss

Part 2: Remove pruning process (i.e. don’t add a default candidate if they are identical), 0.01% loss on average

Part 3: Add clipping to valid range (implemented in SW, not in WD)

Part 3 is also similarly proposed in JCT3V-J0052

Side activity of proponents JCT3V-J0040, 0054, 0058p1&2 to identify commonalities and differences in removing the pruning, and suggest a unified solution.

The report of this side activity was initially uploaded as v3 of JCT3V-J0058, which does no longer contain the original contribution. A new input number should be allocated to this.

13.0.1.1.1.1.1.1.34JCT3V-J0115 Single Depth Intra Mode Simplification [X.Chen, X.Zheng, Y.Lin, J.Zheng (HiSilicon), S.Yoo, S.Yeo (LGE), G.Bang (ETRI), Y.S.Heo, W.W.Gwun, G.H.Park (KHU), G.S.Lee, N.H.Hur (ETRI)] [late]