Adaptive Chroma Loop Filtering for Lower-Signaling Video Coding
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality image/video data, particularly in formats like 4K or 8K and immersive media, leads to higher transmission and storage costs due to the increased amount of information, necessitating a more efficient compression technology and effective signaling of adaptive loop filter (ALF) information.
Innovation Solution
An image decoding method that includes obtaining ALF information and residual information from a bitstream, generating reconstructed samples, and deriving filter coefficients for the ALF, with alternative filter information for the chroma component, to enhance compression efficiency and visual quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adaptive loop filter (ALF) techniques are applied to improve compression efficiency and visual quality, then image/video quality and compression efficiency are improved, but the complexity of signaling ALF-related information increases
Solution Approach 1:
The patent applies different filtering strategies to different color components (luma and chroma) based on their specific characteristics. Alternative filter information is specifically provided for chroma component, allowing differentiated treatment that optimizes compression efficiency for each component type while managing overall signaling complexity.
Solution Approach 2:
The ALF information is segmented into alternative filter information for chroma component and standard filter information for luma component. This segmentation allows independent optimization of signaling methods for different components, reducing the overall complexity by treating each component according to its specific requirements.
2Measurement precision
If high-resolution, high-quality image/video data is transmitted, then image quality is improved, but transmission cost and storage cost increase
Solution Approach 1:
The patent changes the parameters of the filtering process by providing alternative filter information for chroma component, allowing the decoding apparatus to apply more appropriate filtering parameters that maintain high image quality while reducing the bitrate required for transmission, thus lowering transmission and storage costs.
Data Source
AI summary
An image decoding method, according to the present disclosure may comprise: acquiring, from a bitstream, image information including adaptive loop filter (ALF) information including, alternative filter information for a chroma component of a current block, and residual information; generating reconstructed samples for the current block on the basis of the residual information; and generating modified reconstructed samples for the chroma component of the current block on the basis of the alternative filter information.