一个webcam摄像头监控辅助工具，可以间隔检查拍到的内容有没有变化，通过对比现在的图像和前一秒的，如果发现变化，会执行一些你设置的行为，比如锁你的电脑，保存一个jpg图像，播放声音来提醒你，或者运行你自己的程序（比如自动在监控的地方四周启动机关，把变化的位置包围起来..把小偷抓住...哈哈）

Move Action is an open source application that monitors your webcam and can take some action when movement is detected. The action could be to lock your PC (requiring a password to reactive it), save a JPG image to disk, play a WAV sound file or run an external application. It checks the webcam at particular intervals and compares the current image with the previous one. If there is a significant change detected between images the program will take the configured action(s).