中文说明：本文件实现的功能是道路监控视频中的车流量统计，carnum文件用于对各个单车道的通过车辆数进行检测，main文件执行，进行视频上一些辅助线的绘制更便于检测代码的准确性。主题：图像视频处理
English Description：
The function of this file is the traffic flow statistics in the road monitoring video. The carnum file is used to detect the number of vehicles passing through each single lane. The main file is used to draw some auxiliary lines on the video, which is more convenient to detect the accuracy of the code. Subject: image and video processing