背景为白纸，一支笔划过，检测出结果图。

应用：可以监视一个空教室里的人员出入，当有人进入时，此人就会被跟踪（用矩形框框起来），可利用来进行报警等等，同时将他进入的过程用视频保存。-The background is white, one stroke over the detected results Figure

Applications: an empty classroom personnel can monitor access, when someone enters, this person will be tracked (rectangular box) can be used to carry out the alarm, while he entered the video saved.