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

Mining trajectory data has been gaining significant interest in recent years. However, existing approaches to trajectory clustering are mainly based on density and Euclidean distance measures. We argue that when the utility of spatial clustering of