Metadata signal transmission and conversion for film grain coding

Film grain technology with metadata signaling and conversion methods addresses the challenge of encoding film grain, ensuring efficient compression and maintaining the film's aesthetic across different encoding formats.

JP7869238B2Active Publication Date: 2026-06-02DOLBY LABORATORIES LICENSING CORP
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Patent Information

Authority / Receiving Office
JP Β· JP
Patent Type
Patents
Current Assignee / Owner
DOLBY LABORATORIES LICENSING CORP
Filing Date
2022-03-31
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Film grain, inherent in analog film but absent in digital footage, poses challenges to image and video compression algorithms by reducing efficiency and altering the director's creative intent, necessitating improved techniques for encoding and synthesis.

Method used

Implement film grain technology (FGT) with metadata signaling and conversion methods to efficiently encode and simulate film grain, using autoregressive models and additive blending, enabling seamless integration across different encoding formats like AVC, HEVC, VVC, and AV1.

Benefits of technology

Maintains encoding efficiency while preserving the film's intended look, enhancing user experience by providing a consistent film-like aesthetic across various compression formats.

✦ Generated by Eureka AI based on patent content.

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Abstract

A method, system, and bitstream syntax for metadata signaling and conversion for film grain encoding and synthesis are described. Given a bitstream with MPEG film grain SEI messaging, for each picture, a processor detects if the film grain model is suitable for film grain synthesis using an AV1 autoregressive additive mixed noise model, transcodes the MPEG film grain SEI parameters to corresponding AV1 film grain parameters, and synthesizes and adds film grain to the decoded video picture according to the AV1 specification. An example process for converting AV1 parameters to MPEG film grain SEI messaging is also provided.
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