Method and apparatus for local illumination compensation based on gamma correction in video coding system

By introducing a local illumination compensation prediction model with Gamma correction into video encoding and decoding technology, the problem that linear models cannot accurately express the relationship between different frames is solved, thereby improving encoding and decoding efficiency and video quality.

CN122122903APending Publication Date: 2026-05-29MEDIATEK INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MEDIATEK INC
Filing Date
2024-10-31
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing video encoding and decoding technologies cannot accurately represent the relationship between different frames when dealing with changes in local lighting, resulting in limitations in encoding and decoding efficiency and quality.

Method used

A local illumination compensation (LIC) prediction model with Gamma correction is introduced. By adding a Gamma term to the LIC model and deriving the optimal parameters using regression methods, the accuracy and efficiency of local illumination compensation are optimized.

Benefits of technology

It improves the performance of video encoding and decoding, enhances the compensation effect for local lighting changes, and improves encoding and decoding efficiency and video quality.

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Abstract

A method and apparatus for video coding are disclosed. According to the method, input data associated with a current block is received, wherein the input data comprises pixel data to be encoded at an encoder side or data associated with the current block to be decoded at a decoder side, wherein the current block is coded in a non-intra mode. A LIC (local illumination compensation) prediction model is used, wherein the LIC prediction model comprises a gamma term associated with the input signal, and a gamma value of the gamma term is not equal to 1. The current block is encoded or decoded using coding information comprising the LIC prediction model, wherein when the LIC prediction model is selected for the current block, a predictor of the current block is generated by applying the LIC prediction model to a reference block.
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