Video Decoding Residual Sign Flag for Compression Efficiency
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Solution Overview
Problem
High-resolution and high-quality images require efficient compression techniques to reduce transmission and storage costs, as existing methods struggle with the increased amount of information needed for these images.
Innovation Solution
The proposed method improves image coding efficiency by introducing a flag that indicates whether all non-zero residual coefficients in a block have the same sign, allowing for adaptive sign information coding, which reduces the bit allocation for sign information and enhances overall residual coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality images are transmitted, then image quality is improved, but transmission cost and storage cost increase due to increased amount of information
Solution Approach 1:
The patent extracts and separately codes sign information for residual coefficients, allowing efficient representation of high-quality images by focusing only on the essential sign patterns rather than transmitting all coefficient details, thereby reducing transmission cost while maintaining image quality
Solution Approach 2:
The patent changes the parameter of sign information representation by using a flag to indicate whether all non-zero residual coefficients have the same sign, transforming the way sign information is encoded and transmitted to reduce bit allocation while preserving quality
2Measurement precision
If sign information is coded for each residual coefficient, then coding precision is improved, but bit allocation increases
Solution Approach 1:
The patent merges the sign information of multiple residual coefficients into a single flag that indicates whether all non-zero coefficients share the same sign, reducing the total bit allocation while maintaining coding precision through the combined sign representation
Solution Approach 2:
The patent changes the parameter of sign information representation by using a flag to indicate whether all non-zero residual coefficients have the same sign, transforming the way sign information is encoded and transmitted to reduce bit allocation while preserving quality
Data Source
AI summary
A method for decoding a video performed by a decoding device according to the present document comprises: a step for receiving residual information for a current block; a step for parsing one sign flag for a current sub-block of the current block, wherein the one sign flag indicates whether all signs of non-zero residual coefficients of the current sub-block are the same; a step for deriving the non-zero residual coefficients on the basis of sign information for the non-zero residual coefficients when the value of the one sign flag is 1; a step for deriving residual samples on the basis of the non-zero residual coefficients; and a step for restoring a current picture on the basis of the residual samples.