Image Decoding Residual Coding TSRC Flag Signaling
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality images leads to increased transmission and storage costs due to the high amount of information required, necessitating a more efficient image compression technique.
Innovation Solution
The proposed method and apparatus enhance image coding efficiency by deriving residual samples and generating reconstructed pictures, establishing a signaling relationship between dependent quantization and TSRC enabled flags to reduce bit usage and improve residual coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution and high-quality images are transmitted or stored, then image quality is improved, but transmission cost and storage cost increase due to increased data amount
Solution Approach 1:
The patent extracts and transmits only the essential residual information needed for image reconstruction rather than transmitting complete high-resolution image data. By separating and coding only the residual samples that contain the critical difference information between predicted and actual image blocks, the system achieves high-quality reconstruction with reduced data transmission requirements.
Solution Approach 2:
The patent changes the parameter representation by using residual coding with transform skip and dependent quantization techniques. Instead of transmitting full pixel data, the system transforms the image data into residual coefficients and applies adaptive quantization, changing the data representation from spatial domain to frequency domain parameters, thereby reducing the amount of data needed to maintain image quality.
2Measurement precision
If residual coding is performed with detailed flag signaling, then coding precision is improved, but the number of bits to be coded increases
Solution Approach 1:
The patent applies dynamic signaling where the TSRC enabled flag is coded conditionally based on the state of the dependent quantization enabled flag. Rather than always coding the TSRC flag, the system dynamically adjusts the signaling based on the current coding mode, coding the TSRC flag only when dependent quantization is not enabled, thereby reducing unnecessary bit transmission while maintaining coding precision when needed.
Solution Approach 2:
The patent implements partial signaling by only coding the TSRC enabled flag under specific conditions (when dependent quantization is not enabled). This partial action approach avoids the excessive coding of flags that would never be used, reducing the bit amount while maintaining sufficient coding precision for the actual residual reconstruction needs.
Data Source
AI summary
A method, performed by a decoding device, for decoding an image according to the present document comprises the steps of: acquiring residual information of a 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.