完整的PCA 人脸识别的应用包括几个步骤：人脸图像预处理；读入人脸库，训练形成 特征子空间；把训练图像和测试图像投影到上一步骤中得到的子空间上；选择一定 的距离函数进行识别-We present an approach to the detection and identification of human faces and describe a working, near-real-time face recognition system which tracks a s