JVET-K0468 CE12-related: In-loop chroma refinement [E. François, C. Chevance, F. Hiron (Technicolor)] [late]
This was discussed in the BoG JVET-K0552. It is applied for SDR and HDR as well. It will be tested in CE12 along with JVET-K0309.
The notes and recommendation recorded below for this contribution are from its review in the BoG JVET-K0552.
Out-of-loop mapping function refinement was proposed for HDR video in JVET-J0022 and JVET-K0298. In this contribution, the technology is evaluated for chroma components when applied in-loop. The reported BD-rate variations in VTM1.0 for RA configuration are as follows. For HLG content, −4.26% for DE100, 0.06% for PSNRL100, 0.06%, −7.49% and −9.90% for wPSNR-Y, U and V. For PQ content, −1.61% for DE100, 0.05% for PSNRL100, 0.05%, −6.94% and −9.89% for wPSNR-Y, U and V. Encoder and decoder runtimes are both evaluated at 101% of the VTM1.0 runtimes.
It was suggested to also consider this technology in a CE for HDR and SDR content.
The BoG recommended investigating the in-loop chroma refinement (JVET-K0468) in CE on HDR mapping, and in the (potential) CE related to mapping for SDR content.