JVET-Q0315 Non-CE4: Triangular prediction mode with motion vector difference [K. Zhang, L. Zhang, H. Liu, Z. Deng, Y. Wang (Bytedance)]
In this contribution, Triangular prediction mod with Motion Vector Difference (TMVD) is proposed. With TMVD, the MV of a triangular partition in TPM is refined as a sum of a MV derived from a merge candidate and a signalled MVD. The MVD is signalled in a similar way as MMVD, wherein indices of a direction and a distance are coded. Simulation results reported as below:
RA: -0.18%, 103%, 98%
LB: -0.29%, 105%, 100%
Initially discussed in BoG JVET-Q0794.
Follow-up discussion in Track B Wed 15 Jan. (chaired by JRO):
The contribution reports interesting gain when combining MMVD with triangular mode. However, there are two issues:
- No results are available if it would still be effective with GEO
- It is more than just invoking the combination reusing existing logic. The proposal is also modifying the MMVD offset table.
No action is taken on this.