In the contect of the 3GPP study on Film Grain Synthesis (FGS), this technical report documents the findings consequently to the following working objectives:

1. Define motivating use cases and scenarios for the use of Film Grain synthesis in 5G video services.
2. Document relevant existing Film Grain Synthesis technologies that are not included in 3GPP yet.
3. Provide evaluation, using the HEVC standard, of the benefits/drawbacks of any corresponding solutions, including the film grain characteristics SEI message (ITU-T H.274). Such an evaluation may include information on performance results, complexity and implementation aspects, interoperability, system integration, etc. following the example of TR 26.955 based on certain selected or newly defined scenarios.
4. Use the characterization framework in TR 26.955, when possible, and extend it, when necessary, i.e. with subjective tests results.
5. Study and identify relevant UE requirements for consistent usability of the technology.
6. Collaborate with MPEG/JVET and other organizations to ensure broad interoperability on film grain synthesis technologies across different ecosystems.
7. Identify relevant interoperability and system level aspects to potentially support film grain synthesis.
8. Identify if any new normative work would be justified and, if so, provide relevant conclusions.

The present document attempts to evaluate the performance and to justify any potential benefits of film grain synthesis technologies for video compression, a qualitative and quantitative analysis on what would be the costs and benefits of using such technologies would be needed. Clause 4 documents new content that could be used for the purpose of evaluating film grain synthesis technologies and provides some information on the content characteristics. Clause 5 describes a film grain synthesis tool named as the "FGC SEI message designer", which focuses on one particular film grain synthesis technology, i.e. the film grain characteristics (FGC) SEI message and the underlying film grain synthesis technologies it supports and permits the design and visualization of film grain synthesis parameters in the context of that technology. Clause 6 provides some suggestions on how to achieve interoperability using the FGC SEI message while Clause 7 proposes new scenarios that could be added in TR 26.955 for the evaluation of film grain synthesis technologies and provides some preliminary results not validated yet. Finally, Clause 8 introduces some initial considerations on UE requirements.

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

• References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.