JVET-AG0064 AHG12: On Context modelling in Chroma Coefficient Coding [L. Xu, H. Yu, Y. Yu, D. Wang (OPPO)]

This contribution proposes to use the same and consistent spatial neighbors to derive context model index and Rice parameter for the chroma blocks not coded by LFNST or NSPT. The proposed method is implemented on the ECM-11.0 software.

The simulation results of the proposed method under CTC are shown as follows,

RA: -0.00% (Y), -0.02% (U), -0.04% (V)

The simulation results of the proposed method when DualITree=0 are shown as follows,

AI: 0.01%(Y), -0.22%(U), -0.18%(V)

The proposed modification only affects single tree, and is not applicable to dual tree.

Cross checker (also original proponent of JVET-AE0102) confirmed the results.

It was commented that the performance difference due to the proposed modification is negilible in the context of the current stage of exploration.

It was commented that making the proposed modification could also make certain aspects “more complex”.

No action at this stage.

JVET-AG0284 Crosscheck of JVET-AG0064 (AHG12: On Context modelling in Chroma Coefficient Coding) [P. Nikitin (Qualcomm)] [late]

JVET-AG2036 Call for training materials for neural network-based video coding tool development [E. Alshina, F. Galpin, S. Liu, M. Wien] [WG 5 N 266)] (2024-02-09)

Developed from JVET-AG0315.

The draft of WG 5 recommendations was reviewed in JVET at 0845 on Friday 26 Jan.

Future meeting plans, expressions of thanks, and closing of the meeting

Future meeting plans were established according to the following guidelines (assuming face-to-face meetings):

• Meeting under ITU-T SG16 auspices when it meets (ordinarily starting meetings on the Tuesday or Wednesday of the first week and closing it on the Wednesday of the second week of the SG16 meeting – a total of 8-9 meeting days), and
• Otherwise meeting under ISO/IEC JTC 1/‌SC 29 auspices when its MPEG WGs meet (ordinarily starting meetings on the Thursday or Friday prior to the main week of such meetings and closing it on the same day as other MPEG WGs – a total of 8–9 meeting days).

In cases where an exceptionally high workload is expected for a meeting, an earlier starting date may be defined. In cases of online meetings, no sessions should be held on weekend days, such that meetings would typically start two days earlier.

Some specific future meeting plans (to be confirmed) were established as follows:

• During Wed. 17 – Wed. 24 April 2024, 34^th meeting under ITU-T SG16 auspices in Rennes, FR,
• During Fri. 12 – Fri. 19 July 2024, 35^th meeting under ISO/IEC JTC 1/‌SC 29 auspices in Sapporo, JP,
• During Fri. 1 – Fri. 8 November 2024, 36^thmeeting under ISO/IEC JTC 1/‌SC 29 auspices in Antalya, TR (confirmed by host one week after the...