Transform Skip Residual Coding Flag Logic for Image Decoding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to a significant increase in the amount of information to be transmitted and stored, resulting in higher transmission and storage costs.
Innovation Solution
The proposed method and apparatus improve image coding efficiency by using a Transform Skip Residual Coding (TSRC) enabled flag to determine whether TSRC is enabled, based on dependent quantization and sign data hiding flags, and then obtaining and processing residual information accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted, then image quality is improved, but transmission cost increases
Solution Approach 1:
The patent extracts and transmits only the residual information (difference between original and predicted blocks) rather than complete image data. By using TSRC to selectively apply transform operations only when necessary (when residual energy is high), the method extracts and transmits minimal necessary information, reducing transmission cost while maintaining image quality.
Solution Approach 2:
The patent dynamically changes the coding parameter (transform application) based on the content characteristics of each block. The TSRC enabled flag allows the system to switch between transform and non-transform coding modes, adapting the compression strategy to local image characteristics, thereby optimizing the trade-off between quality and transmission cost.
2Manufacturing precision
If high-resolution and high-quality images are stored, then image quality is improved, but storage cost increases
Solution Approach 1:
The patent stores only the essential residual information needed to reconstruct high-quality images. By using TSRC to selectively transform residuals only when necessary, the method extracts and stores minimal necessary data, reducing storage cost while preserving image quality.
Solution Approach 2:
The patent dynamically adjusts the storage format based on residual characteristics. The TSRC enabled flag allows switching between transform-coded and non-transform-coded storage, optimizing storage efficiency while maintaining the ability to reconstruct high-quality images.
3Productivity
If TSRC enabled flag is obtained based on dependent quantization enabled flag and sign data hiding enabled flag, then residual coding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary determination of the TSRC enabled flag based on the states of dependent quantization and sign data hiding flags. This preliminary action allows the decoder to pre-determine whether transform skip residual coding should be applied, avoiding complex runtime decisions and reducing decoding complexity while maintaining coding efficiency.
Solution Approach 2:
The TSRC enabled flag is automatically determined by the decoder based on the received dependent quantization and sign data hiding flags, without requiring additional complex control logic. The system uses the existing flag information to self-determine the appropriate coding mode, reducing overall device complexity.
Data Source
AI summary
A method by which a decoding device decodes an image, according to the present document, comprises the steps of: acquiring a dependent quantization available flag about whether dependent quantization is available; acquiring a sign data hiding available flag about whether sign data hiding is available; and acquiring, on the basis of the dependent quantization available flag and the sign data hiding available flag, a transform skip residual coding (TSRC) available flag about whether TSRC is available.