Chroma Fusion Merge Coding to Cut Cross-Component Bit Overhead

Solution Overview

Problem

The existing video coding technologies, particularly in the H.266/VVC standard, suffer from reduced coding efficiency due to additional bit overhead incurred by incomplete consideration in the chroma prediction mode, specifically in cross-component prediction modes like chroma fusion merge technology.

Innovation Solution

A method is introduced to determine mode enable information for a current block, decoding or encoding a first syntax flag only when a weighted chroma fusion mode is used and the merge mode is enabled, constructing a parameter candidate list, and using model parameters for cross-component prediction, thereby reducing unnecessary bit overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If chroma fusion merge mode is always enabled and coded, then chroma prediction performance is improved, but bit overhead increases due to unnecessary coding when the mode is not actually used

Engineering Contradiction:

Improvechroma prediction performanceVSAvoidbit overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies dynamics by making the chroma fusion merge mode configurable and adaptive rather than fixed. The mode enable information allows the system to dynamically select whether to use the chroma fusion merge mode based on actual video content characteristics, balancing prediction performance with bit rate efficiency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter state of the chroma fusion merge mode from always-active to conditionally-active. By introducing mode enable information as a control parameter, the system can adjust the operational state of the merge mode based on whether it provides actual benefit, thereby reducing unnecessary bit overhead while maintaining prediction accuracy when needed.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If chroma fusion merge mode is conditionally enabled with mode enable information, then bit overhead is reduced, but coding complexity increases due to additional mode determination and syntax flag handling

Engineering Contradiction:

Improvebit overheadVSAvoidcoding complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent segments the chroma prediction process into distinct modes by introducing mode enable information. This segmentation allows the system to separate the chroma fusion merge mode from other chroma prediction modes, enabling selective application of the merge mode based on specific conditions without affecting other prediction pathways.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies dynamics by making the chroma fusion merge mode configurable and adaptive rather than fixed. The mode enable information allows the system to dynamically select whether to use the chroma fusion merge mode based on actual video content characteristics, balancing prediction performance with bit rate efficiency.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If incomplete consideration is given to chroma fusion merge technology, then device complexity is reduced, but coding efficiency deteriorates due to additional bit overhead

Engineering Contradiction:

Improvetechnology implementation complexityVSAvoidcoding efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent changes the parameter state of the chroma fusion merge mode from always-active to conditionally-active. By introducing mode enable information as a control parameter, the system can adjust the operational state of the merge mode based on whether it provides actual benefit, thereby reducing unnecessary bit overhead while maintaining prediction accuracy when needed.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies self-service by enabling the coding system to automatically determine whether the chroma fusion merge mode should be applied. The mode enable information allows the encoder to autonomously assess the suitability of the merge mode for given video content and make decisions without requiring complex external control or manual configuration.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260059102A1Coding method and storage medium

Publication Date: 2026.02.26 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A coding method and a storage medium are provided. The method includes the following. Mode enable information of a current block is determined. If the mode enable information indicates that a weighted chroma fusion mode is used for the current block and a chroma fusion merge mode is enabled for the current block, a bitstream is decoded to determine a value of first syntax flag information. If the first syntax flag information indicates that the chroma fusion merge mode is used for the current block, the bitstream is decoded to determine an index value of the current block. A parameter candidate list of the current block is constructed, and a model parameter of the current block is determined according to the parameter candidate list and the index value, where the model parameter is used for determining a first prediction value of the current block based on a cross-component prediction mode.