利用PCA提取人脸特征，。利用PCA技术降低维数去除了原始原始数据之间的关联性。-Using PCA face feature extraction,. Using PCA technology to reduce dimension in addition to the original connection between the original data.

Matlab 平台使用2DPCA对二维图像数据进行降低图片的维度。提高图像处理速度。(The Matlab platform uses 2DPCA to reduce the dimension of the image data for two-dimensional image data. Improve the speed of image processing.)