研究了背景差分算法，并设计了一种对多车道路段的车流量检测系统。首先通过背景差分的方法，实现了运动前景和背景的分割；进一步使用虚拟检测线实现了多车道车流量的检测。系统平台用Visual C++结合OpenCV进行编程实现。对实际道路环境下的大量的图像序列进行了测试，取得了较好的效果。

The background difference algorithm was studied， and a traffic flow measuring system for multilane road was designed. First， the background difference method was used to achieve the segmentation of moving foreground from background. Then， a virtual test line was used to measure the traffic flow. Visual C++ and OpenCV were used together for the programming. The system was used for testing a large number of road image sequences of the actual environment， and the result showed the effectiveness of it.