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arXiv 2406.09017cs.CV
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一种用于自动化面部表情编码的基于 PCA 的关键点跟踪方法

A PCA based Keypoint Tracking Approach to Automated Facial Expressions Encoding

Indian Institute of Technology Delhi(印度德里理工学院)

Shivansh Chandra Tripathi, Rahul Garg

AI总结:

提出基于 PCA 与面部关键点跟踪的无监督方法,利用 DISFA 生成 PCA AUs,并在 BP4D-Spontaneous 和 CK+ 上验证其高方差解释率与泛化能力。

摘要:

用于研究面部表情的面部动作编码系统(Facial Action Coding System,FACS)是人工的,需要大量精力和专业知识。本文探索使用自动化技术来生成用于研究面部表情的动作单元(Action Units,AUs)。我们提出了一种基于主成分分析(Principal Component Analysis,PCA)和面部关键点跟踪的无监督方法,利用公开可用的 DISFA 数据集生成数据驱动的 AUs,称为 PCA AUs。PCA AUs 符合面部肌肉运动的方向,并且能够解释其他公开测试数据集(BP4D-Spontaneous 和 CK+)中超过 92.83% 的方差,表明它们具有泛化面部表情的能力。在测试数据集上所解释的方差方面,PCA AUs 也可与 FACS AUs 的基于关键点的等价形式相比。总之,我们的研究证明了自动化技术作为人工 FACS 标注替代方案的潜力,这可能带来心理学及相关领域中高效的面部表情实时分析。为促进进一步研究,我们已公开代码仓库。

英文摘要:

The Facial Action Coding System (FACS) for studying facial expressions is manual and requires significant effort and expertise. This paper explores the use of automated techniques to generate Action Units (AUs) for studying facial expressions. We propose an unsupervised approach based on Principal Component Analysis (PCA) and facial keypoint tracking to generate data-driven AUs called PCA AUs using the publicly available DISFA dataset. The PCA AUs comply with the direction of facial muscle movements and are capable of explaining over 92.83 percent of the variance in other public test datasets (BP4D-Spontaneous and CK+), indicating their capability to generalize facial expressions. The PCA AUs are also comparable to a keypoint-based equivalence of FACS AUs in terms of variance explained on the test datasets. In conclusion, our research demonstrates the potential of automated techniques to be an alternative to manual FACS labeling which could lead to efficient real-time analysis of facial expressions in psychology and related fields. To promote further research, we have made code repository publicly available.

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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