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arXiv 2406.01795eess.IV
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使用跨分量样本偏移的视频编码

Video Coding with Cross-Component Sample Offset

Han Gao, Xin Zhao, Tianqi Liu, Shan Liu

AI总结:

本文提出一种名为 CCSO 的无乘法非线性环路内滤波方法,利用亮度样本生成校正信号以提升图像和视频编码效率,已被 AOMedia 下一代视频编解码器采纳,在 PSNR 和 VMAF 指标上分别取得 3.5% 和 1.8% 的客观增益并改善主观视觉质量。

摘要:

除了探索图像和视频压缩中传统的空间、时间及主观视觉信号冗余之外,近期的研究已聚焦于利用跨颜色分量冗余来提升编码效率。跨分量编码方法受到不同颜色分量之间统计相关性的启发,例如在 Y'CbCr 颜色空间中,亮度(Y)颜色分量通常比色度(Cb/Cr)颜色分量展现出更精细的细节。受先前跨分量编码算法的启发,本文引入了一种名为 Cross-Component Sample Offset (CCSO) 的新型环路内滤波方法。CCSO 利用同位置及邻近的亮度样本,为亮度和色度重建样本生成校正信号。它是一个无乘法、使用查找表实现的非线性映射过程。该映射的输入是一组重建的亮度样本,输出则是应用于中心亮度或同位置色度样本的偏移值。实验结果表明,所提出的 CCSO 可应用于图像和视频编码,从而提升编码效率与视觉质量。该方法已被 Alliance for Open Media (AOMedia) 开发的超越 AV1 的实验性下一代视频编解码器所采纳,在随机访问配置下,PSNR 和 VMAF 质量指标分别实现了高达 3.5% 和 1.8% 的显著客观编码增益。此外,CCSO 显著提升了主观视觉质量。

英文摘要:

Beyond the exploration of traditional spatial, temporal and subjective visual signal redundancy in image and video compression, recent research has focused on leveraging cross-color component redundancy to enhance coding efficiency. Cross-component coding approaches are motivated by the statistical correlations among different color components, such as those in the Y'CbCr color space, where luma (Y) color component typically exhibits finer details than chroma (Cb/Cr) color components. Inspired by previous cross-component coding algorithms, this paper introduces a novel in-loop filtering approach named Cross-Component Sample Offset (CCSO). CCSO utilizes co-located and neighboring luma samples to generate correction signals for both luma and chroma reconstructed samples. It is a multiplication-free, non-linear mapping process implemented using a look-up-table. The input to the mapping is a group of reconstructed luma samples, and the output is an offset value applied on the center luma or co-located chroma sample. Experimental results demonstrate that the proposed CCSO can be applied to both image and video coding, resulting in improved coding efficiency and visual quality. The method has been adopted into an experimental next-generation video codec beyond AV1 developed by the Alliance for Open Media (AOMedia), achieving significant objective coding gains up to 3.5\,\% and 1.8\,\% for PSNR and VMAF quality metrics, respectively, under random access configuration. Additionally, CCSO notably improves the subjective visual quality.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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