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19th Meeting: by teleconference, June 2020 2020-06-22 15:35
JVET AHG report: Quantization control (AHG15)
Authors: Roman Chernyak Edouard François Christian Helmrich Sean McCarthy Andrew Segall Jens-Rainer Ohm
Abstract
This document summarizes the activity of AHG15: Quantization control between the 18th Meeting (teleconference, 15 - 24 April 2020) and the 19th Meeting (teleconference, 22 June - 1 July 2020).
Meeting Notes
JVET-S0015 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 18th Meeting (teleconference, 15–24 April 2020) and the 19th Meeting (teleconference, 22 June – 1 July 2020).

There were no emails besides AHG kickoff message sent to the JVET reflector during the AHG period.

The following contribution was identified as related to AHG15.

  • JVET-S0130, On chroma QP mapping, L. Li, X. Li, B. Choi, S. Wenger, S. Liu (Tencent)

VTM Software related activities

The two following quantization control techniques from VTM were exercised:

  1. Perceptual QP adaptation (perceptQPA).
  2. R-D based QP adaptation.

Both methods allow to select and transmit CU level delta QP value and can be used in VTM 9.

Bitstreams generated by perceptual QP adaptation were submitted to VVC Conformance AhG.

The AHG recommended to review all related contributions.

It was asked how much gain is available from R-D optimized QP adaptation and whether that is used in the HM anchor. It was noted that this has a large runtime impact. It was commented that this is probably not being used in the HM anchors.

References:
JVET-S0130
ARCHIVE v1 :
JVET-S0015.docx
Decisions
noted
It was asked how much gain is available from R-D optimized QP adaptation and whether that is used in the HM anchor. It was noted that this has a large runtime impact. It was commented that this is probably not being used in the HM anchors.
Citation