film grain synthesis algorithm

[Hungchih Lai]

Is there a document or pdf or paper describing the film grain synthesis algorithm implemented in libgav1? 

[jz...@google.com]

Hi,

On Monday, October 30, 2023 at 9:39:53 AM UTC-7 Hungchih Lai wrote:

Is there a document or pdf or paper describing the film grain synthesis algorithm implemented in libgav1? 

The film grain synthesis process is described in the AV1 bitstream specification [1]. The libgav1 code references sections of that document in comments.

I'm not aware of any public documentation around the development of the process. This was conducted as part of the Alliance for Open Media Codec Working Group. libaom has some examples related to noise modeling [2][3].

[1]: https://aomediacodec.github.io/av1-spec/#film-grain-synthesis-process 

[2]: https://aomedia.googlesource.com/aom/+/refs/tags/v3.7.0/examples/noise_model.c

[3]: https://aomedia.googlesource.com/aom/+/refs/tags/v3.7.0/examples/photon_noise_table.c

[Hungchih Lai]

Appreciated, very useful information.