Multiple Adaptive Loop Filter Sets for Video Coding Efficiency
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Solution Overview
Problem
Current video encoding and decoding technologies face limitations in adapting to varying content and resolution, leading to suboptimal coding efficiency due to the use of fixed adaptive loop filter sets and limited filter sets, which can result in increased computational complexity and storage requirements.
Innovation Solution
The implementation of multiple adaptive loop filter sets that can be signaled with low overhead, allowing for dynamic selection and application of the best-suited filter sets for different regions of a video frame, improving coding efficiency and reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed adaptive loop filter sets are used, then device complexity is reduced, but coding efficiency deteriorates due to inability to adapt to varying content and resolution
Solution Approach 1:
The patent divides the video content into different regions (e.g., homogeneous regions, edge regions, texture regions) and applies different adaptive loop filter sets to each region. This segmentation allows the system to use multiple specialized filter sets rather than one general-purpose filter set, improving content adaptation while managing complexity through region-based classification
Solution Approach 2:
The patent introduces dynamic selection of adaptive loop filter sets based on content characteristics and resolution. Instead of using a fixed filter set, the system dynamically determines which filter set to apply by analyzing local content properties (such as gradient magnitude, texture complexity) and resolution level, allowing adaptation to varying content while maintaining manageable complexity through conditional selection
2Adaptability or versatility
If limited filter sets are used, then storage requirements are reduced, but coding efficiency deteriorates due to insufficient filter options for different content types
Solution Approach 1:
The patent applies different filter characteristics to different local regions of the video content. By classifying regions into types (e.g., smooth, edge, texture) and selecting filter sets optimized for each type, the system achieves high filter set variety where needed while using fewer filters in homogeneous regions, thereby improving coding efficiency without proportionally increasing storage requirements
Solution Approach 2:
The patent designs adaptive loop filter sets that can serve multiple content types through parameterized filtering operations. The filter sets are constructed with adjustable parameters that allow them to adapt to different content characteristics, reducing the need for completely separate filter sets for each content type and thereby managing storage requirements while maintaining filter set variety
3Productivity
If multiple adaptive loop filter sets are implemented, then coding efficiency is improved through better content adaptation, but computational complexity increases
Solution Approach 1:
The patent applies adaptive loop filtering selectively to only those regions where it provides significant benefit. By classifying video regions and applying complex adaptive filtering only to non-homogeneous regions (edges, textures) while using simpler methods for homogeneous regions, the system improves coding efficiency for important content areas while limiting computational complexity through partial application
Solution Approach 2:
The patent changes filtering parameters (such as filter kernel size, strength, type) based on local content characteristics and resolution level. By adjusting parameters dynamically rather than applying fixed complex filtering everywhere, the system achieves better coding efficiency where needed while reducing computational complexity through parameter adaptation rather than structural complexity
4Adaptability or versatility
If multiple adaptive loop filter sets are signaled, then adaptability is improved, but signaling overhead increases
Solution Approach 1:
The patent performs preliminary classification of video content into regions and pre-determines which adaptive loop filter sets are appropriate for each region before actual filtering. By preparing region classifications and filter set selections in advance based on content analysis, the system enables efficient signaling of only the necessary filter set identifiers rather than transmitting complete filter parameters, thereby improving adaptability while reducing signaling overhead
Data Source
AI summary
A video encoder may be configured to encode multiple adaptive loop filter sets in an adaptation parameter set associated with the video data. A video decoder may receive the multiple adaptive loop filter sets in the adaptation parameter set associated with video data, determine one or more adaptive loop filters from the multiple adaptive loop filter sets, and apply the determined one or more adaptive loop filters to the video data.