Adaptive Loop Filter Scope Signaling for Efficient Video Decoding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images leads to higher information sizes, resulting in increased transmission and storage costs due to conventional wired/wireless broadband and storage mediums.
Innovation Solution
An image decoding method that includes deriving filter coefficients based on adaptive loop filter (ALF) information from picture or slice headers, and generating modified reconstructed samples using these coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality image data is transmitted using conventional wired/wireless broadband lines, then image quality is improved, but transmission cost increases
Solution Approach 1:
The patent applies adaptive loop filtering with dynamically adjusted filter coefficients based on image characteristics and block types. This changes the processing parameters to optimize compression efficiency, allowing high image quality at lower bit rates, thereby reducing transmission cost while maintaining measurement precision
2Measurement precision
If high-resolution and high-quality image data is stored using conventional storage mediums, then image quality is improved, but storage cost increases
Solution Approach 1:
The patent modifies the image data through adaptive loop filtering and optimization parameters to achieve higher compression ratios. This reduces the quantity of data that needs to be stored while maintaining image quality, directly addressing the contradiction between storage cost and image quality
3Productivity
If Adaptive Loop Filter procedure is applied at picture level, then decoding efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the Adaptive Loop Filter application into different scopes: picture-level filtering and slice-level filtering. This segmentation allows flexible control where picture-level filtering provides overall efficiency improvements while slice-level filtering offers finer-grained control, managing the complexity by dividing the processing into manageable units based on actual needs
Data Source
AI summary
Proposed in an image decoding method according to the present disclosure is indication information regarding whether an adaptive loop filter (ALF) procedure to be applied to a current block is applied at a picture level or at a slice level.