JVET-F0007 JVET AHG report: JEM coding of HDR/WCG material (AHG7) [A. Segall (chair), E. Francois, D. Rusanovskyy (vice chairs)]

The document summarized activities related to the AHG on JEM coding of HDR/WCG material between the 5th and the 6th JVET meetings.

Activities related to the mandates of this AHG include

• Sequences generated with the recommended conversion practices decided at the previous meeting were generated and released for study. The sequences were made available at:

ftp://ftp.ient.rwth-aachen.de/testsequences/testset_hdr/

• Candidate software integrating the HDR/WCG specific tools required for the anchor defined in JVET-E1020 was released for study. The software included support for luma and chroma adaptive quantization parameters. The software was made available at:

https://jvet.hhi.fraunhofer.de/svn/svn_HMJEMSoftware/branches/candidates/HM-16.6-JEM-5.0.1-AHG7-Anchor/

• Anchors for the Call for Evidence HDR test were created and cross-checked. The results were reported to the reflector on March 20, 2017.
• Anchors for the Common Test Conditions were created and cross-checked. (Note that this was side activity and not officially reported to JVET at the time of this report.)

During the generation of the CfE anchors, the following observations were reported to the AhG. It is suggested to further discuss these during the 6th meeting in combination with related input documents.

• It was commented that during anchor production and visual assessment of the results that the bit rates for the HDR3 (EBU_05_Hurdles) and HDR4 (EBU_06_Starting) test sequences may be swapped.
• The original capture frame rates for these same sequences is 100 fps. However earlier study on HDR in MPEG and JCT-VC, including verification testing in JCTVC-X1018, suggested that these sequences should be coded and viewed as if they were 50 fps.

In JVET discussion, the suggested fixes for these two issues were agreed.

Two input contributions were noted to be related:

• JVET-F0086AHG7: Information on CfE anchor generation for HDR content and comments on coding conditions [D. Rusanovskyy, A. K. Ramasubramonian (Qualcomm), E. François (Technicolor)]
• JVET-F0089 AHG7: Comments on metrics for extended colour volume content E. François, C. Chevance, F. Hiron (Technicolor), D. Rusanovskyy (Qualcomm)]

The AHG recommended to:

• Review all related contributions.
• Identify and discuss open issues related to the coding of HDR/WCG material.