利用OpenCV打开笔记本电脑摄像头，测试拌线告警功能。
利用OpenCV打开笔记本电脑摄像头，测试绊线告警功能。
绊线也称为“穿越警戒线”、“越界”，是一般摄像头均支持的智能事件之一。该程序实现了从计算机的摄像头获取视频，进行绊线检测的演示。
1、用CMake解析OpenCV3.4.6源码（VS2015 x64），然后用Visual Studio 2015编译OpenCV。
2、为本项目添加OpenCV的头文件目录和附加库目录，编译本项目。
3、上述步骤可省略，OpenCV3.4.6的库文件和头文件已添加到本工程，但是使用者需自行编译动态链接库opencv_world346.dll/opencv_world346d.dll。
2019-7-10更新
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