摘要
基于摄像机在车道上方,车辆沿车道行驶的情况,利用车体上参考点在摄像机像面上竖直方向坐标和车辆行驶距离的关系,间接获得车辆行驶距离,从而鉴定车速。在一般车道上方摄像机参数(焦距、角度、高度)条件下,通过理论分析和实验验证,得出车体上参考点在摄像机像面上竖直方向坐标和车辆行驶距离的倒数近似成线性关系。选择车体前部或后部一个参考点,对车道上方摄像机进行现场标定,可得出参考点在像面上竖直方向坐标和车辆行驶距离倒数的线性拟合公式,利用该拟合公式即可进行车速测量工作。测量方法操作简便、测量结果可靠,可用于交通事故中车速的司法鉴定工作。
In the situation that a vehicle is driving along the lane and there is a camera above the lane.The relationship between the vertical coordinates of the reference point on car body on the image plane of the camera and the driving distance of the vehicle are used to obtain the driving distance of the vehicle indirectly,so as to identify the vehicle speed.Under the condition of general lane cameras’parameters(focal length,angle,height),through theoretical analysis and experimental verification,it is concluded that the vertical coordinate of the reference point on car body on the image plane of the camera has an approximately linear relationship with the reciprocal of vehicle driving distance.By selecting a reference point at the front or rear of the car body and calibrating the lane camera on site,a linear fitting formula of the vertical coordinate of the reference point on car body on the image plane and the reciprocal of the vehicle driving distance can be obtained,and then the vehicle speed can be measured.This method with easily operation and good measurement results can be used in the judicial authentication of vehicle speed for traffic accident.
作者
贾常明
JIA Changming(Forensic Science College,Criminal Investigation Police University of China,Shenyang 110035,China)
出处
《光学技术》
CAS
CSCD
北大核心
2021年第5期608-612,共5页
Optical Technique
基金
中国刑事警察学院校内课题资助(D2019037)。
关键词
视频方法
车速鉴定
线性拟合
video method
vehicle speed identification
linear fitting
