Chroma QP Offset Signaling for Joint CbCr Residual Coding
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Solution Overview
Problem
Current video coding standards face challenges in efficiently adjusting chroma quantization parameters for joint CbCr components at the coding unit level, particularly in hybrid video coding systems, which affects compression performance and bandwidth usage.
Innovation Solution
The proposed solution involves determining whether joint CbCr residual coding is enabled and signaling syntax elements to adjust chroma quantization parameters for the joint CbCr component at the coding unit level, allowing for more precise control and optimization of chroma QP values within the video processing system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If joint CbCr residual coding is enabled with CU level chroma QP adjustment, then coding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent enables independent chroma QP adjustment at CU level specifically for joint CbCr residual coding, allowing different QP values to be applied to different regions (Cb and Cr components) based on local characteristics. This local quality control improves coding efficiency by optimizing compression for each chroma component independently while maintaining manageable device complexity through selective application of the feature.
2Productivity
If chroma QP adjustment is signaled at CU level, then compression performance is improved, but bandwidth usage increases
Solution Approach 1:
The patent segments the chroma QP adjustment into separate syntax elements for Cb and Cr components at CU level, allowing selective signaling only when joint CbCr residual coding is enabled. This segmentation improves compression performance by enabling precise local optimization while controlling bandwidth usage through conditional signaling that avoids redundant information transmission.
Solution Approach 2:
The patent applies partial action by signaling chroma QP adjustment syntax elements only when joint CbCr residual coding is enabled, rather than unconditionally for all coding units. This selective application improves compression performance where needed while minimizing bandwidth consumption by avoiding unnecessary signaling in cases where the feature is not utilized.
Data Source
AI summary
The present disclosure provides method and systems for signaling information regarding chroma quantization parameter (QP) offsets. According to some disclosed embodiments, the methods include: determining whether a joint CbCr residual coding is enabled; and in response to the joint CbCr residual coding being determined to be enabled, signaling a syntax element for adjusting chroma quantization parameter (QP) for joint CbCr component at coding unit (CU) level.