Chroma Illumination Compensation for Screen Content Video Coding
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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 deriving scale and offset parameters based on the presence of screen captured content, refining these parameters if their product is below a threshold, and applying local illumination compensation using these derived parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If local illumination compensation is applied to screen captured content, then video quality is improved, but coding complexity increases
Solution Approach 1:
The patent applies local illumination compensation specifically to chroma components in screen captured content, rather than applying it uniformly to all video data. This selective application improves video quality for the specific problem area (chroma in screen content) while limiting the overall complexity increase to only where needed.
Solution Approach 2:
The patent modifies existing video coding parameters by introducing scale and offset parameters for chroma local illumination compensation. These parameter changes enable the compensation to be applied adaptively based on the presence of screen captured content, balancing quality improvement with complexity management through parameter-based control.
2Productivity
If chroma local illumination compensation is implemented, then coding efficiency is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary detection to identify screen captured content before applying the full chroma local illumination compensation process. This preliminary action allows the system to skip unnecessary processing for non-screen content, improving overall coding efficiency while reducing processing time by avoiding redundant operations.
Solution Approach 2:
The patent applies chroma local illumination compensation partially, only to the chroma components and only when screen captured content is detected. This partial application improves coding efficiency for the specific case of screen content while minimizing the processing time overhead by not applying the full compensation process to all video data.
3Measurement precision
If scale and offset parameters are refined, then compensation accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent employs feedback mechanisms to refine scale and offset parameters for chroma local illumination compensation. By using feedback from the video data to adjust these parameters, the system achieves higher compensation accuracy while managing computational complexity through iterative refinement processes that converge on optimal parameter values.
Data Source
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 the video includes screen captured content. The device may perform local illumination compensation using the derived scale and offset parameters.