Residual Coding Efficiency via Transform Skip Signaling
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Solution Overview
Problem
The increasing demand for high-resolution, 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
The method and apparatus enhance residual coding efficiency by establishing a signaling relationship between dependent quantization and transform skip enabled flags, allowing for reduced bit usage when transform skip is not enabled, and optimizing residual coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement 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 parameter changes by dynamically adjusting the transform skip mode based on block characteristics. By changing the processing parameters (transform vs. transform skip) according to local image features, the system achieves better compression efficiency without sacrificing overall image quality, thereby reducing transmission and storage costs while maintaining high-quality output
2Measurement precision
If residual coding is performed with detailed flag information, then coding precision is improved, but the amount of bits to be coded increases
Solution Approach 1:
The patent extracts only the necessary flag information (tsrc_enabled_flag) rather than transmitting all possible residual coding parameters. By selectively taking out only the essential control flags needed for transform skip mode indication, the system maintains coding precision while significantly reducing the bit overhead associated with signaling residual coding parameters
3Productivity
If transform skip mode is enabled for all blocks, then residual coding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamics by enabling transform skip mode selectively rather than uniformly across all blocks. The system dynamically adjusts the coding mode based on block characteristics, using the tsrc_enabled_flag to indicate when transform skip should be applied. This dynamic approach improves residual coding efficiency for suitable blocks while avoiding unnecessary complexity for blocks where standard transform is more appropriate
Data Source
AI summary
A method by which a decoding device decodes an image, according to the present document, comprises the steps of: acquiring residual information about the current block; deriving residual samples of the current block on the basis of the residual information; and generating a reconstructed picture on the basis of the residual samples.