HEVC Quantization Parameter Determination for Multi-Format YUV
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Solution Overview
Problem
The HEVC video standard lacks flexibility in quantization parameter management for color components across different color formats, requiring additional memory to store specific tables and limiting adaptability to formats other than 4:2:0 YUV.
Innovation Solution
A method that associates each intermediate quantization parameter value with a corresponding chroma component quantization parameter using simplified tables for 4:2:0, 4:2:2, and 4:4:4 YUV formats, reducing memory requirements and allowing flexible function selection based on current color formats, with optional function insertion in bit streams for encoding and decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple specific tables are stored for different color formats (4:2:0, 4:2:2, 4:4:4), then the quantization parameter determination is precise for each format, but the memory requirements increase and the system complexity increases
Solution Approach 1:
The patent applies universality by designing a single quantization parameter determination table that can be used across multiple color formats (4:2:0, 4:2:2, 4:4:4 YUV). Instead of maintaining separate tables for each format, the invention creates a unified table structure that handles all formats, thereby reducing memory requirements while maintaining the precision needed for each specific format through appropriate parameter selection and calculation.
2Measurement precision
If multiple specific tables are stored for different color formats, then the quantization parameter determination is precise for each format, but the device complexity increases
Solution Approach 1:
The invention reduces device complexity by implementing a universal quantization parameter determination mechanism that serves multiple color formats. The single table approach eliminates the need for complex table selection logic and multiple data structures, simplifying the overall system architecture while preserving format-specific precision through unified parameter calculation methods.
Solution Approach 2:
The patent merges the functionality of multiple format-specific tables into a single comprehensive table. By combining what would have been separate data structures for 4:2:0, 4:2:2, and 4:4:4 formats into one unified table, the invention reduces structural complexity and simplifies the management of quantization parameters across different color formats.
3Quantity of substance
If a single universal table is used for all color formats, then the memory requirements are reduced and system complexity is reduced, but the adaptability to different color formats may be limited
Solution Approach 1:
The patent applies local quality by allowing the universal quantization parameter determination table to be configured with format-specific parameters and characteristics. Each color format (4:2:0, 4:2:2, 4:4:4) can utilize the same table structure but with locally optimized parameter values and calculation methods tailored to its specific requirements, thereby maintaining high adaptability while using a unified memory structure.
Solution Approach 2:
The invention enables adaptability to different color formats through parameter changes within the universal table framework. By adjusting quantization parameter values, offset values, and calculation parameters based on the specific color format being processed, the system maintains versatility and format-specific precision without requiring separate tables, thus preserving adaptability while reducing memory requirements.
Data Source
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AI summary
The value of a quantization parameter for at least one second color component of an image or image portion is determined using a current color format among several possible color formats. The determination comprises the steps of selecting at least one function associated with a possible color format, and determining the value of the quantization parameter for the second color component by applying said at least one function to a value of an intermediate quantization parameter which is based on the value of the quantization parameter of the first color component of the image or image portion. The at least one function is selected independently from the current color format.