mexDDGrab.dll　一定要将其放在WORK目录下。以下文件也一样。 mmread 可读取各种视频格式的文件，用法在M文件中。 avermatrix　提取静止的背景。 frame2bmp　将视频帧存为BMP格式。 show 仔细阅读，可单步输入MATLAB命令窗口运行。-mexDDGrab.dll must put WORK directory. Following the same document. mmread can read a variety of vide

功能：本程序演示MATLAB常用命令的基本操作 用法：运行该程序后，切换到命令窗口，按提示进行操作-Function: This procedure commonly used MATLAB command demonstrate the basic operation Usage: Run this program, the switch to the command window, according to instructions