JVET-X0147 EE2-related: intra mode derivation based on TIMD for GPM inter/intra [H. Jang, S. Kim, J. Lim (LGE), Y. Kidani, H. Kato, K. Kawamura (KDDI)] [late]

This contribution proposes a TIMD based intra mode derivation and its application without signalling to indicate which intra mode is used on geometry intra-region for the geometry partitioning mode with inter and intra (GPM inter/intra) which was proposed by JVET-W0110. It also restricts that an intra with intra combination is applied. With the proposed method, GPM inter/intra does not need pre-defined IPM candidates, which are adaptively selected along with the GPM angle. The intra mode is derived by reusing the conventional TIMD method. The suggested GPM with inter/intra method show further reported gain against EE2-3.2 a/b test with similar encoding complexity.

Simulation result of the proposed method over ECM-2.0(Tool-off test) is summarized as follow.

• RA : -0.06%, -0.15%, -0.11% / EncT : 101%, DecT : 100%
• LDB : -0.13%, -0.54%, -0.59% / EncT : 102%, DecT : 100%
• LDP : -0.48%, -1.64%, -1.19% / EncT : 106%, DecT : 99%

For an additional information, GPM storage modification which is introduced in JVET-X0166 option5 also implemented and simulated for this propose method. Simulation result are summarized as follow:

• LDP : -0.54%, -1.60%, -1.35% / EncT : 106%, DecT : 98%

This is included in JVET-X0166; no separate review was deemed necessary.