Screen Content Chroma Compensation Using Adaptive Scale and Offset

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Solution Overview

Problem

Existing video coding standards struggle to effectively handle chroma local illumination compensation, particularly in screen captured content, leading to suboptimal video quality and efficiency.

Innovation Solution

Implement techniques for chroma local illumination compensation by determining and applying scale and offset parameters based on the presence of screen captured content, using derived parameters for encoding and decoding processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If existing video coding standards are used for chroma local illumination compensation, then general video coding functionality is maintained, but video quality and encoding efficiency deteriorate for screen captured content

Engineering Contradiction:

Improvevideo qualityVSAvoidadaptability to screen captured content

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent applies local quality by differentiating processing for screen captured content versus regular video content. It introduces a content type identifier that detects whether the input is screen captured content, and then applies specific chroma local illumination compensation parameters (scale and offset) only when needed. This targeted approach improves video quality for screen content without unnecessarily complicating the general video coding pipeline.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes parameters by introducing content-specific scale and offset parameters for chroma local illumination compensation. When screen captured content is detected, specific parameter values are applied that are optimized for the characteristics of screen content (such as uniform backgrounds and text), whereas regular video content uses different or default parameters. This parameter differentiation resolves the contradiction by adapting the coding standard to specific content types.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If chroma local illumination compensation is applied to all video content, then video quality improves, but encoding complexity and computational overhead increase

Engineering Contradiction:

Improvechroma compensation accuracyVSAvoidencoding complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by performing content type detection and parameter selection before the actual chroma local illumination compensation process. A content type identifier is established in advance to determine whether the input is screen captured content, and appropriate scale and offset parameters are pre-selected based on this classification. This preliminary classification avoids unnecessary computational overhead for regular video content that doesn't require specialized chroma compensation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies partial action by selectively applying chroma local illumination compensation only when screen captured content is detected, rather than applying it universally to all video content. The content type identifier enables this selective application, ensuring that the additional computational complexity is incurred only when it provides actual benefit, thus resolving the contradiction between quality improvement and complexity reduction.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If standard video coding techniques are used without content-specific optimization, then encoding simplicity is maintained, but encoding efficiency deteriorates for specialized content types

Engineering Contradiction:

Improveencoding efficiencyVSAvoidcoding system complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies universality by designing a coding system that can handle both regular video content and screen captured content through a unified framework. The content type identifier and conditional parameter selection mechanism allow the same basic chroma local illumination compensation structure to serve multiple content types, with automatic adaptation based on content characteristics. This multi-functionality improves encoding efficiency for screen content while maintaining compatibility with standard video coding for other content.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent applies dynamics by making the chroma local illumination compensation parameters adaptive rather than fixed. The scale and offset parameters are dynamically selected based on the detected content type, allowing the system to optimize encoding efficiency for screen captured content while maintaining standard performance for regular video. This dynamic adaptation resolves the contradiction by enabling efficiency improvements without permanently increasing system complexity.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260012602A1Systems and methods for performing local illumination compensation for screen captured content in video coding

Publication Date: 2026.01.08 SHARP KK

AI summary

A device may perform local illumination compensation. The device may determine whether video includes screen captured content. The device may derive a scale and an offset parameter for local illumination compensation based on whether video includes screen captured content. The device may perform local illumination compensation using the derived scale and offset parameters.