说明：  基于PCA的人脸识别matlab代码。建立特征脸空间，而后将预存人脸图像和待识别图像投影到特征脸空间上，可以得到较高的识别率
(Based on PCA face recognition matlab code. The eigenface space is established, and then the stored face image and the image to be recognized are projected onto the feature face space, and a higher recognition rate)