4、表情识别（Expression Recognition）：是指对人的面部表情，如快乐、惊奇、愤怒、恐惧、厌恶、悲伤等进行分类识别，是计算机视觉研究的重要组成部分n 41。
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facial expression recognition 表情识别 ; 表情辨识 ; 面部表情识别 ; 识别
time expression recognition 时间表达式识别
Face Expression Recognition 脸表情识别 ; 面部表情识别 ; 人脸表情识别 ; 表情识别
subtle expression recognition 细微表情识别
micro-expression recognition 微表情识别
Temporal Expression Recognition 时间信息识别
mathematical expression recognition 数学公式识别
Human facial expression recognition is a very important but also difficult subject.
人脸表情识别是模式识别中一个非常重要却十分复杂的课题。
In this paper, Facial Expression Recognition of the four main areas were carried out research work.
本文在人脸表情识别的四个主要环节上均进行了研究工作。
A method of subtle expression recognition based on hybrid features and classifier tree is presented in this paper.
因此提出了基于混合特征和分类树的细微表情识别方法。
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