JVET-AF0101 AHG12: ECM software cleanup for decoder side intra predictions acceleration [Z. Fan, Y. Yasugi, T. Ikai (Sharp)]

This proposal proposes a software change to accelerate the ECM by addressing the multiple initialization of prediction image in three intra prediction methods: TMRL in JVET-AB0157, TIMD in JVET-W0123 , and sortedMPM in JVET-AD0085. The modification is software only and no changes in simulation results. The proposed modification reportedly shows 2% and 6% encoding and decoding time reduction in AI and 1% encoding and decoding time reduction in RA respectively.

Cross checker confirms the losslessness nature of this contribution, and reported 2% and 4% encoding and decoding in AI config, respectively. RA results are not yet completed at the time of presentation.

It was commented that such software-only changes could also be submitted as merge requests, rather than having a contribution and a full discussion at the JVET meeting.

It was commented that it is strongly encouraged for software coordinators and AHG chairs to acknowledge such merge reqests (i.e. those that are targeted toward encoding/decoding/memory consumption reduction without causing any algorithm-level changes) in the AHG report. This was agreed.

Decision (SW): Adopt JVET-AF0101