CCTV镜头选择工具，通过监控范围来选择合适的镜头焦距。也可通过镜头的焦距，以及镜头跟监控目标的距离，来计算出视频的范围。-CCTV lens select tools.it use to select the focus of the lens by monitoring Area.also can counter the area of video by focus and distance.

在matlab环境下讲视频文件读入,程frames状,基本上所有的视频格式都支持,(In the matlab environment, read the video file, cheng frames, basically all the video format support,)