JVET-AM0104 EE2-related: On reference sample filtering for TIMD [V. Rufitskiy, A. Filippov, T. Dong (TCL)]

This contribution relates to the EE2-1.7 in which always non-smoothing 8-tap interpolation filter is used to obtain TIMD prediction. In this contribution it is proposed to disable usage of {1, 2, 1}-filtered reference samples when a TIMD intra prediction mode (no matter primary or secondary) is integer slope. It is reported that on top of ECM-17.0, the overall coding performance for {Y, U, V, EncT, DecT} is: {-0.03%, -0.04%, -0.06%, 99.8%, 99.8%} for AI configuration.

Benefit on top of EE2-1.7a is 0.01%. Some more simplification by removing the 3-tap filter.

According to cross-checker, 1 line of code change on top of 1.7a. Cross-checker would support immediate adoption, as it is very simple. Cross-check matching so far, but not complete for classes A.

Contributors were requested to provide a software attachment and detailed Excel sheet. Follow-up review on Tuesday 1 July 1235. The requested information was provide, and it was confirmed by independent experts an the software coordinator that the software modification is straightforward and simple.

Decision: Adopt JVET-AM0104 on top of EE2-1.7a.