说明：  这可是由Takeo Kanade 撰写的人脸识别方面的文章。研究人脸表情识别与人脸识别的都需要这篇文章，这也是难得的国外资源啊！
(This is written by Takeo Kanade Face Recognition articles. Research on Facial Expression Recognition and Face Recognition need this article, this is a rare foreign resources ah!)