Weighted Prediction Signaling for Video Compression
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality images and videos, particularly in fields like virtual reality and ultra-high definition, poses challenges for efficient compression, transmission, and storage due to the increased data requirements, leading to higher costs and signaling overheads.
Innovation Solution
A method and apparatus for enhancing video/image compression efficiency by efficiently signaling a prediction weighted table syntax and reducing signaling overhead through weighted prediction, which involves parsing a prediction weighted table syntax from a bitstream, deriving weightings for weighted prediction, and reconstructing pictures based on these weightings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution, high-quality image/video is transmitted and stored, then image quality and resolution are improved, but transmission and storage costs increase
Solution Approach 1:
The patent extracts only the essential prediction information needed for reconstruction by using weighted prediction with reference picture lists. Instead of transmitting all reference picture data, only the necessary weighted prediction parameters are extracted and transmitted, reducing the data amount while maintaining image quality.
Solution Approach 2:
The patent changes the parameters of prediction by introducing weighted prediction factors and reference picture list management. By adjusting weighting parameters and selectively managing reference pictures, the system achieves better compression efficiency while maintaining high-quality reconstruction, thus reducing transmission and storage costs.
2Measurement precision
If weighted prediction information is signaled in detail, then prediction accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the critical weighted prediction parameters that contribute most to prediction accuracy. By selecting and signaling only the essential parameters (such as reference picture list indices and weighting factors) rather than all possible prediction details, the signaling overhead is reduced while maintaining adequate prediction accuracy.
Solution Approach 2:
The patent applies partial signaling by providing weighted prediction information only when and where it is most beneficial. Instead of signaling complete prediction information for all blocks, the system selectively applies weighted prediction with appropriate signaling, reducing overall signaling overhead while maintaining prediction accuracy where it matters most.
Data Source
AI summary
A video decoding method performed by a video decoding device according to this document comprises the steps of: parsing prediction weighted table syntax from a bitstream; parsing information on the number of reference pictures in a reference picture list from the prediction weighted table syntax; deriving weights for weighted prediction on the basis of the information on the number of reference pictures; deriving prediction samples of a current block by performing weighted prediction for the current block on the basis of the weights; and reconstructing a current picture on the basis of the prediction samples, wherein the prediction weighted table syntax may be parsed from a picture header of the bitstream.