在一个视频图象上捕获目标，并且显示需要捕获的区域，它对于多目标的检测还不够完善，此外运行本程序需要安装DirectＸ．-In a video image captured the target, and shows the need to capture the region, its multi-target detection is also not perfect, in addition to running this program will need to install Direc