利用2dPCA算法实现的人脸识别程序，值得一看，效果比较好 -2dPCA algorithm using face recognition program, worth a visit, the effect is better

基于opencv的PCA程序，不是调用opencv的PCA函数，而是利用opencv的读写，根据主成分算法原理而写的！-PCA program based on OpenCV, OpenCV PCA function is not called, but to read and write using OpenCV, based on the algorithm of principal component and write!