Efficient coefficient film grain synthesis for codecs without film grain synthesis
US11765372B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2021 |
| Grant date | Sep 19, 2023 |
| Priority date | — |
| Expiry date | Aug 26, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Techniques for emulating frequency coefficients of film grain for video (e.g., frame) encoding are described. According to some embodiments, a computer-implemented method includes receiving a request to encode a video with film grain at a content delivery service, performing a film grain synthesis on a frame of the video with film grain to generate film grain metadata for the frame and generate a degrained frame from the frame, determining film grain emulation frequency coefficients based at least in part on the film grain metadata for the frame, performing a frequency transform on the degrained frame to generate frequency coefficients for the degrained frame, encoding the frame into an encoded frame, by the content delivery service, based at least in part on the frequency coefficients for the degrained frame and the film grain emulation frequency coefficients, and transmitting the encoded frame from the content delivery service to a viewer device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.