Image Decoding Adaptive Offset Processing for Color Difference Signals
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Solution Overview
Problem
Current image compression methods, such as H.264/AVC, do not effectively improve coding efficiency for color difference signals, limiting their application in high-resolution image compression, especially in environments with limited bandwidth like the Internet.
Innovation Solution
Incorporating a color difference adaptive offset processing section in image decoding and encoding devices, which performs adaptive offset processes based on data generated from brightness adaptive offset processing, to enhance coding efficiency for color difference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional image compression methods (H.264/AVC) are used, then coding is supported for standard resolutions, but coding efficiency for color difference signals in high-resolution images is insufficient
Solution Approach 1:
The image signal is segmented into brightness signal and color difference signal, with separate adaptive offset processing applied to each. The brightness adaptive offset processing section processes the brightness signal independently, while the color difference adaptive offset processing section processes the color difference signal independently, allowing optimized handling of each signal type's specific characteristics
Solution Approach 2:
Different offset processing strategies are applied to different signal components based on their local characteristics. The adaptive offset values for brightness and color difference signals are calculated and applied separately, with the color difference processing utilizing data generated from brightness processing to enhance local quality in chroma regions
2Productivity
If adaptive offset processing is applied only to brightness signal, then brightness coding efficiency is improved, but overall image coding efficiency remains limited
Solution Approach 1:
The brightness adaptive offset processing and color difference adaptive offset processing are merged into a unified processing framework. The color difference processing section utilizes data generated from the brightness processing section, combining the benefits of both processing streams to achieve improved overall coding efficiency while maintaining color accuracy
Solution Approach 2:
Data generated from the brightness adaptive offset processing is fed back into the color difference adaptive offset processing section. This feedback mechanism allows the color difference processing to benefit from the brightness signal analysis, improving color difference coding efficiency without requiring completely independent processing
3Loss of energy
If compression rate is increased for mobile phone applications, then bandwidth usage is reduced, but image quality deteriorates
Solution Approach 1:
The invention changes the processing parameters by applying adaptive offset compensation to both brightness and color difference signals. This parameter change in the decoding process improves image quality at lower bit rates by compensating for quantization errors in the chroma components, which are particularly affected at high compression ratios
Data Source
AI summary
An image decoding apparatus includes a brightness adaptive offset processing section and a color difference adaptive offset processing section. The brightness adaptive offset processing section performs a brightness adaptive offset process with regard to brightness signal of an image to be decoded. The color difference adaptive offset processing section performs a color difference adaptive offset process with regard to a color difference signal based on data generated by the brightness adaptive offset process by the brightness adaptive offset processing section to generate a decoded image.