Inter Prediction Motion Update for Higher Image Coding Efficiency
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality images leads to higher transmission and storage costs due to the increased amount of information, necessitating a more efficient image compression technique.
Innovation Solution
A method and apparatus for updating motion information of a target block after decoding, using modified motion information to improve coding efficiency and reduce distortion propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional image transmission and storage methods are used for high-resolution images, then image quality is maintained, but transmission cost and storage cost increase significantly
Solution Approach 1:
The patent extracts and transmits only the residual information (difference between original and predicted blocks) rather than complete image data. This allows high-resolution image quality to be maintained while significantly reducing the amount of data requiring transmission and storage, thereby lowering costs.
Solution Approach 2:
The patent uses prediction blocks as copies or approximations of the actual image blocks. By creating prediction blocks from reference images and only transmitting the differences (residuals), the system maintains image quality while reducing data volume for transmission and storage.
2Productivity
If motion information is not updated after decoding, then decoding process is simple, but coding efficiency decreases and distortion propagates to neighboring blocks
Solution Approach 1:
The patent implements self-service by having the decoded block itself generate updated motion information that is then used to improve the prediction of neighboring blocks. The system uses its own output (decoded block) to enhance its subsequent processing, creating a self-improving loop that increases coding efficiency without requiring external intervention.
Solution Approach 2:
The patent introduces feedback by using the decoded block to generate updated motion information that feeds back into the prediction process for neighboring blocks. This feedback mechanism allows the system to continuously improve prediction accuracy by incorporating information from previously decoded blocks, thereby enhancing coding efficiency.
Data Source
AI summary
An image decoding method performed by a decoding device according to the present invention comprises the steps of: acquiring information on inter prediction of a target block through a bit stream; deriving motion information of the target block on the basis of the information on inter prediction; deriving a prediction sample by performing inter prediction for the target block on the basis of the motion information; generating a reconstruction block on the basis of the prediction sample; deriving modified motion information of the target block on the basis of the reconstruction block; and updating the motion information of the target block on the basis of the modified motion information. According to the present invention, modified motion information of the target block can be calculated, and the motion information of the target block can be updated on the basis of the modified motion information, so that the overall coding efficiency can be improved.