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-The background difference algorithm was studied，and a traffic flow measuring system for multilane road was designed