Image Decoding Flag Signaling for Residual Bit Reduction
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Solution Overview
Problem
The increasing demand for high-resolution and 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
An image decoding method that enhances residual coding efficiency by establishing signaling relationships between flags such as TSRC, dependent quantization, and transform skip, thereby reducing the number of bits coded and improving overall 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 extracts and transmits only the residual information (difference between original and predicted blocks) rather than complete image data. By separating the prediction component (which can be reconstructed from reference blocks) from the residual component (which needs transmission), the system reduces the amount of data that must be transmitted while preserving image quality.
Solution Approach 2:
The patent performs prediction operations before transmission by generating predicted blocks from reference blocks. This preliminary action allows the decoder to reconstruct most of the image data locally, requiring only the residual differences to be transmitted, thereby reducing transmission bandwidth requirements while maintaining high image quality.
2Adaptability or versatility
If residual coding is performed with multiple flags (TSRC, dependent quantization, transform skip), then coding flexibility is improved, but the number of bits required for signaling increases
Solution Approach 1:
The patent implements dynamic flag signaling where the TSRC enabled flag is conditionally signaled based on the state of other flags (dependent quantization enabled flag and transform skip enabled flag). This dynamic approach allows the system to adapt the signaling overhead to the actual coding needs, providing coding flexibility when required while minimizing bit usage when the features are not applicable.
Solution Approach 2:
The patent applies partial signaling by only transmitting the TSRC enabled flag when necessary (when dependent quantization and transform skip are both disabled). This partial action approach avoids transmitting redundant flag information while maintaining the ability to use TSRC when beneficial, thus balancing coding flexibility with bit efficiency.
Data Source
AI summary
A method by which a decoding device decodes an image, according to the present document, comprises the steps of: acquiring prediction-related information about the current block; acquiring residual information about the current block; deriving a prediction sample of the current block on the basis of the prediction-related information; deriving a residual sample of the current block on the basis of the residual information; and generating a reconstructed picture on the basis of the prediction sample and the residual sample.