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AHG17: Design for signallilng reshaper model
Abstract
This contribution proposes a design for signalling luma mapping with chroma scaling (LMCS), a.k.a. reshaper model. The proposed design is based on the suggested design by the HLS BoG after review of all related contributions addressing the problem.
JVET-N0805 AHG17: Design for signalling reshaper model [W. Wan (Broadcom), P. Yin (Dolby), Hendry (Huawei), S. Paluri, J. Zhao, J. Lim, S. Kim (LGE), W. Choi, K. Choi, K. Choi (Samsung)] [late]
This contribution proposes a design for signalling luma mapping with chroma scaling (LMCS), a.k.a. reshaper model. The proposed design is based on the suggested design by the HLS BoG after review of all related contributions addressing the problem.
After review of contributions addressing signalling LMCS model, the following design was suggested by the HLS BoG:
- Optionally send LMCS parameters in the SPS.
- Define APS types for ALF and LMCS parameters. Each APS has only one type.
- Send LMCS parameters in APS
- If LMCS tool enabled, have a flag in the TGH to indicate that LMCS aps_id is present or not. If not signalled, the SPS parameters are used.
- Need to add semantic constraint to always have something valid that is referred to when tool enabled.
From the discussion in track A, it was suggested that it would be better to avoid sending LMCS parameters in SPS. This can easily be resolved by specifying that at least one corrsponding APS has to be available when LMCS is enabled.
Proponents were asked to update the proposal accordingly.
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Decisions
Proponents were asked to update the proposal accordingly.
Citation