JVET-AG0013 JVET AHG report: Film grain technologies (AHG13) [W. Husak, P. de Lagrange (co-chairs), A. Duenas, D. Grois, Y. He, X. Meng, M. Radosavljević, A. Segall, G. Teniou, A. Tourapis (vice-chairs)]

Discussion

For this AHG period, there were three major topics of conversation. ISO/IEC 23002-9 DTR was edited to reflect feedback from ITU and ISO editors. The group also discussed content containing film grain for development, demonstrations, and testing of systems and processes. Also discussed were metrics and characterization for film grain synthesis. Finally, the group discussed potential future topics for the Technical Report.

Additional editing of the DTR continues due to comments that originated from the ISO and ITU editors. Most were changes due to editorial comments. Several comments related to references to AOM documents and github sites remain to be addressed.

An extensive amount of time was spent on content. Apple created a dataset using both content captured by Apple and content that is publicly available. The dataset is comprised of approximately 20 sequences with 27 variants and stored as YUV files along with proxies. Several people had copied the data and begun tests.

Disney reported on their tests on the Tears of Steel content. The tests are an effort to reduce the number of clips. The methodology and results were shared. In short, the method subtracted the original video from the video under test and analyzed the film grain characteristics. This method seems to be popular as it has been independently explored by a number of companies.

The group discussed there are outside organizations that would find value in the report. One observation is that the TR is background on film grain but not what would be considered an Engineering Guideline (EG) or a Recommended Practice (RP) in other organizations. JVET needs to consider perhaps doing best practices (ISO EG/RP) – as part of the AHG report v2. Capturing the experiences of the group and perhaps even the creatives could be useful to outside organizations.

Related contributions

Eight contributions related to AHG13 were identified as of 2024-01-26.

• One contribution was this AHG report:
  • JVET-AG0013 JVET AHG report: Film grain technologies (AHG13)
• Seven other contributions were uploaded at the time of the report drafting:
  • JVET-AG0101 Film grain adaptive SEI message
  • JVET-AG0140 FGS Extension SEI message for spatial adaptation
  • JVET-AG0153 Proposed FGS applications
  • JVET-AG0160 FGS Extension SEI message useful descriptors
  • JVET-AG0215 Region-dependent film grain characteristics
  • JVET-AG0228 source for scanned film test sequences
  • JVET-AG0290 Compressibility analysis of Film Grain test sequences
  • JVET-AG0295 On Film Grain Synthesis Subjective Evaluation

Contributions

The seven contributions uploaded other than the AHG report are summarized below.