交通监视系统通过采集实时交通流量数据，为智能化交通运输服务和控制管理提供依据，在智能交通系统中有着极其重要的作用。
Traffic monitoring plays an important role in intelligent transportation systems. It can be used to collect real time traffic data concerning traffic flow.
在基于视频图像的交通监视系统中，由路边建筑、树木等物体引起的静态阴影和由运动物体如车辆引起的运动阴影，是导致车辆检测错误的一大主要因素。
Passive shadows resulted from roadside buildings or trees and active shadows caused by moving vehicles, are one of the factors that arise errors in video based vehicle detection.
描述：监视器：公共汽车信息管理系统跟踪城市公交车的位置，计算驾驶距离和时间、发布紧急交通事件信息。
Caption: Monitor: the bus Information Management System tracks the location of city buses, calculates driving distances and times, and addresses traffic emergencies.
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