Video Coding Weighted Prediction Signaling
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality images/videos, especially in fields like VR, AR, and immersive media, necessitates a highly efficient compression technique to reduce transmission and storage costs, as existing methods are inefficient in handling the increased data requirements.
Innovation Solution
A method and apparatus for enhancing video/image coding efficiency through weighted prediction, where a flag determines the parsing location of a prediction weighted table syntax within a bitstream, allowing for efficient signaling and reduced redundant signaling in transmitting weighted prediction information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If weighted prediction information is always signaled in picture header, then prediction accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by differentiating the signaling location of weighted prediction information based on the picture type. For B pictures, the prediction weighted table syntax is signaled in the picture header, while for P pictures, it is signaled in the slice header. This localized approach ensures that weighted prediction information is provided where most needed (B pictures with higher prediction difficulty) while reducing unnecessary signaling in P pictures, thereby resolving the contradiction between prediction accuracy and signaling overhead.
2Productivity
If prediction weighted table syntax is parsed from picture header, then weighted prediction efficiency is improved, but bitstream complexity increases
Solution Approach 1:
The patent segments the bitstream structure into different hierarchical levels (picture header and slice header) and assigns the prediction weighted table syntax to different levels based on picture type. This segmentation allows efficient weighted prediction processing at the appropriate hierarchy level, improving prediction efficiency while avoiding unnecessary complexity in the overall bitstream structure by only including the syntax where required.
Data Source
AI summary
A video decoding method performed by a video decoding device according to the present document comprises the steps of: parsing a flag pertaining to a weighted prediction from a bitstream; parsing the syntax of a prediction weighted table from the bitstream based on the flag; performing a weighted prediction for the current block in the current picture based on the prediction weighted table syntax to generate prediction samples for the current block; generating residual samples based on residual information acquired from the bitstream; and generating reconstructed samples for the current block based on the prediction samples and the residual samples, wherein the prediction weighted table syntax can be parsed from the picture header of the bitstream based on the value of the flag being 1, and can be parsed from the slice header of the bitstream based on the value of the flag being 0.