基于车载式视频图像的车辆行驶速度鉴定

Vehicle speed identification based on the videos recorded by mobile video recorder

文章论述了基于车载式视频图像鉴定道路交通事故中目标车辆行驶速度的基本原理,提出一种依据射影几何学中的交比不变性原理测算目标车辆行驶距离的算法。该算法可以避免因车辆运动轨迹与视频摄录设备镜头光学轴线不垂直而产生的误差,从而提高了目标车辆行驶速度鉴定的精确度。最后根据一个真实案例,探讨了用车载式视频图像进行车辆行驶速度鉴定的方法、步骤以及主要注意事项,可为评价这一鉴定方法的准确性和科学性提供参考。

In this paper,we discoursed the basic principle of speed identification of the target vehicle based on the videos recorded by mobile video recorder in a road traffic accident,and further,proposed an algorithm for estimating the driving distance of the target vehicle according to the principle of projective invariant in the projective geometry.The algorithm can avoid the error caused by the movement trajectory of the target vehicle and non-verticality of the lens optical axis of the video recorder,so as to improve the accuracy of the target vehicle speed identification.In addition,we applied our proposed algorithm to a real case to discuss the method,procedure,and main attentions in the identification for the speed of the target vehicle involved in a traffic accident using a mobile video recorder,which can be a reference for evaluating the accuracy and scientific validity of the proposed identification method.