Encoding method, decoding method, bitstream, encoder, decoder, and storage medium

By determining the reference block and LIC model parameters of the current block, the problem of high bitstream overhead caused by the transmission of LIC flag bits for local illumination compensation is solved, thereby improving encoding and decoding efficiency.

WO2026143534A1PCT designated stage Publication Date: 2026-07-09GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD
Filing Date
2024-12-31
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

In existing technologies, the transmission of the identifier bit in Local Illumination Compensation (LIC) results in high bitstream overhead, low encoding/decoding efficiency, and reduced encoding/decoding performance.

Method used

By determining the reference block corresponding to the current block, including adjacent reconstructed blocks, non-adjacent reconstructed blocks, or blocks filled based on preset values, the system determines whether the current block uses the LIC model based on the LIC identifier of the reference block, and determines the model parameters of the LIC model, directly deriving the predicted value of the current block, thus avoiding the transmission of the LIC identifier of the current block in the bitstream.

Benefits of technology

It saves on codeword overhead, improves encoding and decoding efficiency, and enhances encoding and decoding performance.

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Abstract

Disclosed in embodiments of the present application are an encoding method and a decoding method, comprising: determining a reference block corresponding to a current block, wherein the reference block comprises at least one of the following: one or more neighbor reconstructed blocks corresponding to the current block, one or more non-neighbor reconstructed blocks corresponding to the current block, and one or more blocks filled on the basis of a preset value; on the basis of an LIC identifier corresponding to the reference block, determining whether the current block uses an LIC model, wherein the LIC identifier is used for determining whether the reference block uses the LIC model; and when it is determined that the current block uses the LIC model, determining model parameters of the LIC model, and determining a predicted value of the current block on the basis of the model parameters.
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