Chrominance Quantization Parameters by Transform Unit Size
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Solution Overview
Problem
Existing picture compression technologies struggle to efficiently encode and decode high-resolution and high-definition images, particularly in flexible network environments with varying bandwidth, necessitating improved quantization methods for chrominance components.
Innovation Solution
A method and apparatus that determine chrominance component quantization parameters based on transform unit size information, using decoding and mapping relationships to apply different quantization parameters for each transform unit, enhancing encoding/decoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single quantization parameter is used for all transform units, then the encoding process is simple, but the compression efficiency deteriorates when handling high-resolution images with varying transform unit sizes
Solution Approach 1:
The patent applies different quantization parameters to different transform units based on their sizes. Specifically, it determines separate quantization parameters for first transform units (e.g., 4x4, 8x8) and second transform units (e.g., 16x16, 32x32), allowing each region to be quantized according to its specific characteristics and size, thereby improving compression efficiency without excessive complexity
Solution Approach 2:
The patent segments the transform units into different categories based on size and applies different quantization parameters to each segment. This segmentation allows the encoder to optimize compression for each transform unit size independently, balancing the complexity of parameter determination with the benefits of improved compression efficiency
2Productivity
If different quantization parameters are applied to different transform units, then compression efficiency improves, but the bit stream size increases due to additional parameter information
Solution Approach 1:
The patent applies different quantization parameters only to transform units that require it (i.e., larger transform units), while using a default or unified parameter for smaller transform units. This partial application approach improves compression efficiency for the most demanding regions without the overhead of specifying parameters for all transform units, thus controlling bit stream size growth
3Productivity
If chrominance component quantization is performed without considering transform unit size, then the processing is faster, but the picture quality and compression performance deteriorate
Solution Approach 1:
The patent dynamically adjusts the quantization parameters based on the transform unit size during the encoding process. Instead of using a fixed quantization approach, it adapts the quantization strength according to the specific transform unit being processed, allowing for optimized picture quality while maintaining reasonable encoding speed through efficient parameter determination
Data Source
AI summary
Disclosed are a method for determining a color difference component quantization parameter and a device using the method. Method for decoding an image can comprise the steps of: decoding a color difference component quantization parameter offset on the basis of size information of a transform unit; and calculating a color difference component quantization parameter index on the basis of the decoded color difference component quantization parameter offset. Therefore, the present invention enables effective quantization by applying different color difference component quantization parameters according to the size of the transform unit when executing the quantization.