JVET-AF0275 AHG12: Intra TMP extension to DIMD, LIC and SGPM [F. Le Léannec, K. Naser, G. Rath, T. Dumas, P. Bordes, Y. Chen (InterDigital)] [late]
This contribution proposes three extensions to the intra TMP prediction mode in ECM.
The first extension concerns DIMD. It is proposed to adaptively select between planar or block-vector based prediction obtained from IntraTMP or IBC mode of neighbouring blocks for the blending with an angular intra prediction.
The second extension consists in allowing Local Illumination Compensation in blocks coded in IntraTMP mode. LIC is already allowed for IBC blocks. Thus, extending it to IntraTMP harmonizes IntraTMP and IBC with regards to LIC usage.
Lastly, block-vector-based prediction obtained from IntraTMP or IBC modes of the neighbouring blocks are included in the candidate list of SGPM, as proposed in contribution JVET-AF0226.
The following results were obtained for AI and RA configurations.
AI: -0.09% (Y) -0.01% (U) -0.12% (V) 100.8% (EncT) 100.6% (DecT)
For screen contents in AI configuration:
Class F: -0.40% -0.36% -0.29% 101.7% (EncT) 100.5% (DecT)
Class TGM: -0.78% -0.79% -0.78% 99.9% (EncT) 100.3% (DecT)
The two elements (LIC and DIMD) in this contribution that are not in JVET-AF0226 bring more gain for camera-view content, but have limited additional benefit for screen content.
One expert expressed support for studying this in an EE, considering all elements are intraTMP related.
It was agreed to investigate this in an EE, conduct separate tests on individual elements (LIC, DIMD, SGPM) as well as combination tests.