说明：  利用OpenCV进行人脸检测的训练，特征提取，和分类器等，在ＶＣ环境下的开发详细过程，可供刚接触计算机视觉的朋友参考和学习。
(Use OpenCV for face detection training, feature extraction, and classification, etc., in the VC environment, the development of detailed process available to a friend new to computer vision, reference and learning)