JVET-D0192 BoG Report on Extended Colour Volume Material [A. Segall]

The BoG met on October 18, 2016 to address the following mandates:

• Review EE9/AH7 related contributions
• Discuss and agree on conversion methods
• Discuss and agree on test procedures for extended colour volume materials.

Conversion methods:

Overview: The goal of the conversion method discussion is to identify the target container or containers for studying the coding performance of extended colour volume material, and how content in other containers would be converted to the identified target containers.

It was suggested to consider the BT.2020 colour primaries in the target container

It was suggested that PQ should be considered as a transfer function.

It was suggested that HLG could be considered as a transfer function. However, this could be done as a second step and later activity. One participant suggested that we may be able to convert from PQ to HLG.

Recommendation of BoG: Use a container with BT.2020 colour primaries and the PQ transfer function.

When converting legacy (SDR) content to the target container, one suggestion was to map the RGB 8-bit value of 235 to 100 cd/m2 and map the RGB 8-bit value of 16 to 0.01 cd/m2, as defined in BT.2035.

Note that it will be necessary to confirm the scaling. It was commented that perhaps as a way to accelerate the study, it would be useful to generate multiple representations with different cd/m2 value targets. For example, 300 and/or 400 cd/m².

There was clarification discussion about the meaning of scaling. It was suggested that this would be a multiplication....

JVET-D1030 JVET common test conditions and evaluation procedures for 360 video [E. Alshina, J. Boyce, A. Abbas, Y. Ye] [2016-11-11] (MPEG N16515)

A draft of this document was presented to the plenary Thursday afternoon. During the closing plenary on Friday, the document was approved without further review; no experts had complaints about the procedure.

It was reminded that in cases where a JVET document is also made available as an MPEG output document, a separate version under the MPEG document header should also be generated. This version should be sent to GJS and JRO for review and upload.

JVET-D0165 Cross-check of JVET-D0098 Decoupling decoder-side intra mode derivation from entropy decoding [Alexey Filippov, Vasily Rufitskiy, Haitao Yang (Huawei)] [late]

EE9: Adaptive Scaling for Extended Colour Volume (2)

Primary (2)

From summary report JVET-D0010:

This experiment studies an alternative to the residual scaling proposed in JVET-B0054. The motivation in JVET-B0054 is to remove the overhead of delta QP that is signalled by the encoder to compensate for the reshaping of quantization noise as a function of brightness in next generation containers such as ST 2084.

Questions recommended to be answered during EE tests:

[Q]: What is performance of JVET-C0066, JVET-C0095 and JVET-C0102 using the content and test conditions provided by the AhG 7 on JEM coding of extended colour material with:

• Results reported with the weighted BD-Rate and BD-PSNR metrics, where the weighting corresponds to the target luma-to-QP mapping function.
• Results reported with BD-Rate and BD-PSNR for the tPNSRY and deltaE metrics, where the metrics are computed from linear RGB
• Results reported for visual quality assessment

[A]: Only partial data available.

[Q]: What is the benefit of combining different aspects of the JVET-C0066, JVET-C0095 and JVET-C0102?

[A]: Not answered yet.

Conclusion from EE summary: The test procedure should be agreed first. AhG7 was discussing testing procedure.

BoG (coordinated by A. Segall) recommendation: Review EE results, and agree conversion method and test procedure

See further discussion under JVET-D0192: Both proposals are to be further investigated in new EE6.