JVET-R0015 JVET AHG report: Quantization control (AHG15) [R. Chernyak, E. François, C. Helmrich, S. McCarthy, A. Segall]

This document summarizes the activity of AHG15: Quantization control between the 17th meeting in Brussels, BE (7–17 Jan 2020) and the 18th Meeting (teleconference, 15-24 April 2020).

The regular JVET e-mail reflector was used for discussions (jvet@lists.rwth-aachen.de) with [AHG15] in message headers. There were no emails besides AHG kickoff message sent to the JVET reflector during the AHG period.

Category 1 AHG pre-meeting of the 18th JVET meeting

The following AHG15 related contributions were identified as related to Quantization control signalling section of Category 1 AHG pre-meeting. Notes from the Category 1 pre-meeting are available in JVET-R0339.

1. JVET-R0050, AHG9: HLS on dependent quantization and sign data hiding, S.-T. Hsiang, T.-D. Chuang, Y.-W. Huang, S.-M. Lei (MediaTek)
2. JVET-R0068, AHG8/AHG9/AHG12: Miscellaneous HLS topics, Y.-K. Wang, L. Zhang, Z. Deng, J. Xu, K. Zhang, K. Fan (Bytedance)
3. JVET-R0073, AHG9: Some cleanups on QP delta signalling, Z. Deng, L. Zhang, Y.-K. Wang, J. Xu, K. Zhang (Bytedance)
4. JVET-R0076, AHG9/AHG15: Chroma QP mapping table cleanups, J. Xu, L. Zhang, Y.-K. Wang, K. Zhang, Z. Deng (Bytedance)
5. JVET-R0272, AHG9: On chroma QP offsets in picture header, K. Misra, J. Samuelsson, S. Deshpande, F. Bossen, A. Segall (Sharp)
6. JVET-R0302 AHG12: On signalling of chroma QP, L. Li, X. Li, B. Choi, S. Wenger, S. Liu (Tencent)

Category 2 AHG pre-meeting of the 18th JVET meeting

The following AHG15 related contributions were identified as related to Quantization control section of Category 2 AHG pre-meeting and they were discussed in session 2.5 Tue 14 April 0520-0630. Notes from the Category 2 pre-meeting are available in JVET-R0340.

1. JVET-R0055, AHG15: On referencing a non-existent scaling list, C.-Y. Lai, O. Chubach, C.-Y. Chen, T.-D. Chuang, Y.-W. Huang, S.-M. Lei (MediaTek)
2. JVET-R0127, AHG15: On scaling list prediction, A. K. Ramasubramonian, B. Ray, G. Van der Auwera, M. Karczewicz (Qualcomm)
3. JVET-R0166, AHG15: Issue on chroma scaling matrix for 4:4:4, K. Abe, T. Toma (Panasonic)
4. JVET-R0326, AHG15: On Chroma Quantization Matrix Signalling, H. Zhang, X. Li, G. Li, L. Li, S. Liu (Tencent)

The following AHG15 related contribution was identified related to Transform skip section of Category 2 AHG pre-meeting and it was discussed in session 2.4 Thu 9 April 2320 - Fri 10 April 0115.

1. JVET-R0045, AHG15: cleanup for signalling of minimum QP of transform skip, J. Li, K. Abe (Panasonic)

The following AHG15 related contribution was identified related to ACT section of Category 2 AHG pre-meeting.

1. JVET-R0380, Scaling list for adaptive colour transform, S. Iwamura, S. Nemoto, A. Ichigaya (NHK), K. Naser, P. de Lagrange, F. Le Leannec, P. Bordes (InterDigital)

The AHG recommended to review all related contributions and continue investigating VVC Quantization control techniques.

Using adaptive rate control for QP signalling experiments was suggested in the discussion.