人脸识别用双向2DPCA方法写得人脸识别代码，基于ORL的，自己写的，可运行，网上没有，分享给大家学习。-Face recognition using two-way code is written 2DPCA method, based on ORL, and his writing, can run, on-line did not, share with them to learn.

A fault detection and diagnose algorithm used in batch process.