说明：  人脸表情识别是模式识别领域中一个非常活跃的研究方向。人脸表情识别包括:从背景图像中检测人脸 在视频中对人脸进行跟踪 提取表情特征 表情识别。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。
(Facial expression recognition is the field of pattern recognition in a very active research direction. Facial Expression Recognition include: background image from the detected face in the video face tracking for facial expression extraction characteristic expression recognition. In this paper, Facial Expression Recognition of the four main areas were carried out research work.)