说明：   该程序使用Kinect的人脸跟踪功能，跟踪视野内的人脸，当跟踪到人脸的时候在人脸上画网状格，跟 踪人脸丢失的时候，将原始的彩色图像显示在该窗口内，即当人脸丢失后对窗口内的图像进行更新。
(The program using the Kinect face tracking, face tracking vision, when tracking a person' s face when the human face painted mesh grid, tracking face lost when the original color image is displayed in the window i.e., when the human face is lost after the image within the window to be updated.)