说明：  实现功能：TigerBoard开发板模拟下人脸检测门禁系统，以继电器开关带代替门禁上电磁锁的开关，通过LED灯观察状态
(Realization of function: TigerBoard development board simulation under the face detection access control system, with the relay switch to replace the access control on the electromagnetic lock switch, through the observation of the state of LED lights )