JVET-AM0071 AHG12: Extensions on ALF-CCCM [L. Xu, N. Song, Y. Yu, H. Yu, D. Wang (OPPO)]

This contribution proposes two changes to the ALF-CCCM. The first change is to introduce the non-downsampled filters in the ALF-CCCM. The second change is to reuse the CU coding partition in the ALF-CCCM. The proposed two changes are tested on top of ECM-17.0 [1] software. The simulation results are shown as below:

Overall: 0.01%/-0.13/-0.11%, ClassF: 0.00%/-0.25%/-0.31%, TGM: -0.01%/-0.48%/-0.57% for RA

Overall: 0.00%/-0.51%/-0.37%, ClassF: -0.10%/-0.42%/-0.57%, TGM: -0.12%/-1.01%/-1.08% for LDB

Overall: 0.01%/-0.70%/-0.67%, ClassF: -0.05%/-0.82%/-0.92%, TGM: -0.02%/-0.93%/-1.01% for LDP

It was asked what the benefit of the two aspects was, and how often these are used. Not known.

Interest was expressed to investigate this in an EE. The two aspects shall be investigated separately, and also in combination with JVET-AM0070.