使用OpenCV2.4.8，简单的人脸识别程序-Use OpenCV2.4.8, simple face recognition program

nao机器人自带的人脸识别功能的实现，以及基于人脸识别的人数统计。-Nao robot comes with the realization of the function of face recognition, as well as the number of statistics based on the face recognition.