Chroma Quantization Parameter Tables for Higher Image Coding Efficiency
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in transmission and storage costs due to the large amount of information required, necessitating a more efficient image compression technique.
Innovation Solution
An image decoding method that determines a chroma quantization parameter table based on a flag, allowing for separate quantization parameters for Cb and Cr components, improving coding efficiency by adapting to image characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted or stored, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent applies different quantization parameters to different chroma components (Cb and Cr) based on their respective characteristics. By allowing separate quantization parameter tables for Cb and Cr components, the system optimizes compression for each component locally rather than applying a uniform quantization approach, thereby improving overall compression efficiency while maintaining image quality
Solution Approach 2:
The patent introduces a flag mechanism that enables dynamic selection between different quantization parameter configurations. When the flag indicates separate quantization parameter tables are used, the system changes the parameter structure to provide independent QP values for Cb and Cr components, adapting the quantization process to image characteristics and reducing redundant data transmission
2Productivity
If separate quantization parameters are applied to Cb and Cr components, then coding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements a dynamic quantization parameter table structure where the system can switch between different configurations based on a flag. The quantization parameter tables are dynamically selected during decoding - either using separate tables for Cb and Cr components or a unified table - allowing the system to adapt to different image characteristics without requiring permanently complex structures
Solution Approach 2:
The flag mechanism serves multiple functions: it indicates whether separate quantization parameter tables should be used, controls the decoding path selection, and enables the system to handle both separate and unified quantization scenarios with a single unified decoding framework. This multi-functionality reduces the need for separate dedicated structures for each case
Data Source
AI summary
An image decoding method performed by a decoding device, according to the present document, comprises the steps of: obtaining a flag indicating whether one chroma quantization parameter table is applied to chroma components; obtaining chroma quantization parameter data on the basis of the flag; deriving the chroma quantization parameter table on the basis of the chroma quantization parameter data; deriving a chroma quantization parameter for the chroma components on the basis of the chroma quantization parameter table; deriving residual samples for the chroma components on the basis of the chroma quantization parameter; and generating a reconstructed picture on the basis of the residual samples.