利用视频图像计算车辆速度

Calculating Vehicle Spead by Using Video Images

交通事故车辆行驶速度的确认,是分析事故发生原因及认定事故责任的重要依据。在交通违法案件处理过程中,车辆行驶速度超过道路规定限制值的多少,也决定了驾驶人所受处罚程度的轻重。利用固定式视频图像计算车辆行驶速度时,通常需要在目标车辆同侧车身表面距地等高位置上,选取两个至车辆纵向对称面等距离的特征点,二者之间的距离为被鉴定车辆的行驶位移。当视频图像模糊不清晰,难以准确选取前述的特征点时,仅能依靠车辆同侧车身易于识别的特征位置,对车辆行驶速度进行粗略的估算,计算结果的精度较低。通过建立数学模型,对一起交通事故车辆的行驶速度进行分析研究,并通过调整相关参数提高鉴定结果的精准度。

The confirmation of the driving speed of vehicles in traffic accidents is an important basis for analyzing the causes of accidents and determining the responsibility.In the process of handling traffic violation cases,the amount by which the vehicle's speed exceeds the prescribed limit on the road also determines the severity of the punishment imposed on the driver.When calculating the driving speed of a vehicle using fixed video images,it is usually necessary to select two feature points that are equidistant from the longitudinal symmetry plane of the vehicle at a height equal to the ground on the same side of the body surface of the target vehicle.The distance between the two points is the driving displacement of the identified vehicle.When the video image is blurry and unclear,and it is difficult to select the aforementioned feature points according to standards,only relying on the easily recognizable feature positions of the vehicle body on the same side can make a rough estimation of the vehicle's driving speed,and the accuracy of the calculation results is relatively low.By establishing a mathematical model,analyze and study the driving speed of a vehicle in a traffic accident,adjust relevant parameters to improve the accuracy of the identification results.