说明：  This matlab code implements the face recognition system. It uses the AT&T database. You need to download the database before running the code. Instruction to download the database is in the comment section of the file. 这个Matlab程序使用eigenface系统实现人脸识别，它使用AT&T的数据库，运行代码实例前，请阅读其中的comment，下载该数据库。
(This matlab code implements the face recognition system. It uses the AT )