打开摄像头，进行图像预处理和灰度化，两种二值化方法-Open the camera, image pre-processing and grayscale two binarization method

在matlab上运用PCA的方法进行人脸识别，包括灰度处理，二值化。-In the use of PCA on the method of PCA face recognition, including gray processing, binarization.