US 12,452,441 B2
Metadata signaling and conversion for film grain encoding
Sean Thomas McCarthy, San Francisco, CA (US); Peng Yin, Ithaca, NY (US); Vijayakumar Gayathri Ramakrishna, Bengaluru (IN); Kishore Chamarthi, Tirupathi (IN); and Kaustubh Shripad Patankar, Bengaluru (IN)
Assigned to Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
Appl. No. 18/279,651
Filed by Dolby Laboratories Licensing Corporation, San Francisco, CA (US)
PCT Filed Mar. 31, 2022, PCT No. PCT/US2022/022958
§ 371(c)(1), (2) Date Aug. 31, 2023,
PCT Pub. No. WO2022/212792, PCT Pub. Date Oct. 6, 2022.
Claims priority of provisional application 63/249,401, filed on Sep. 28, 2021.
Claims priority of provisional application 63/210,789, filed on Jun. 15, 2021.
Claims priority of application No. 202141015755 (IN), filed on Apr. 2, 2021; and application No. 202141029381 (IN), filed on Jun. 30, 2021.
Prior Publication US 2024/0179330 A1, May 30, 2024
Int. Cl. H04N 19/34 (2014.01); H04N 19/40 (2014.01); H04N 19/46 (2014.01); H04N 19/85 (2014.01)
CPC H04N 19/34 (2014.11) [H04N 19/40 (2014.11); H04N 19/46 (2014.11); H04N 19/85 (2014.11)] 11 Claims
OG exemplary drawing
 
1. A method to process film grain metadata, the method comprising:
receiving an input video bitstream and associated input film grain information according to a first video coding standard;
parsing the input film grain information to generate input film grain parameters for film grain synthesis according to a film grain parameter set of the first video coding standard;
generating output film grain parameters for noise synthesis according to a film grain parameter set of a second video coding standard by transcoding the input film grain parameters, wherein the second video coding standard is different than the first video coding standard;
generating output film noise by using noise synthesis according to the second video standard based on the output film grain parameters;
decoding the input video bitstream according to the first video coding standard to generate decoded video pictures; and
adding the output film noise to the decoded video pictures to generate output video pictures;
wherein the input film grain information is received in an MPEG SEI message that comprises AV1 film grain parameters and the output film grain parameters according to the MPEG video coding standard are generated only if a flag is established indicating a fulfilling of constraints.