Study On Analysis Method Of Road Traffic Accident Based On Video

Accurate traffic accident analysis plays an important role in improving the quality of accident handling.With the large number of applications of monitoring systems,the use of video for traffic accident analysis has become a convenient technical means.Using video data to analyze the whole process of collision of accident vehicles is a difficult point for comprehensive analysis of accidents.Therefore,the research in this paper has important practical and useful value.Firstly,through the investigation and research on the domestic and international accident reconstruction methods,this paper establishes a new vehicle speed calculation model based on the shortcomings of the current domestic standards,and integrates the acceleration of the vehicle between two adjacent frames into the model,forming an improved time.The interpolation method reduces the calculation error caused by the assumption made in the standard "the vehicle moves uniformly between adjacent frames" to calculate the vehicle speed before the collision.The trajectory reconstruction model of the accident vehicle is established by using the perspective transformation theory in computer vision.The motion parameters such as the vehicle's centroid position,vehicle azimuth and vehicle angular velocity are calculated,and the collision is calculated.And the speed of the car after collision could be obtained combined with the motion of centroid and the video frame rate.Using momentum moment and momentum conservation,the parameters such as vehicle speed,azimuth and angular velocity before and after collision are used as inputs to solve the vehicle speed at the time of vehicle collision.Secondly,in order to verify the accuracy of the established model,the calculation accuracy under different running speeds,shooting distances and vehicle acceleration was measured,and compared with the calculation method of vehicle speed without considering inter-frame acceleration.The results show that the shooting distance has little effect on the calculation results.The highest accuracy of the algorithm is that the vehicle has the most obvious improvement effect when braking at higher speed.At the same time,the GPS positioning module was used to carry out the real vehicle experiment.The latitude and longitude coordinates of the vehicle turning moment and the real-time azimuth of the vehicle were measured.Compared with the calculated centroid position and real-time azimuth,the maximum relative error of the trajectory calculation result was within 5%,the feasibility of the algorithm is proved.Then,based on the theoretical model of vehicle speed calculation,video-based accident reproduction software was developed using C# language,including video playback module,vehicle speed calculation module,track reproduction module and result output module.According to the time interpolation method,the vehicle speed calculation module is designed to obtain the continuous vehicle speed.Through the trajectory reproduction module,the position and azimuth of the vehicle are output and the vehicle trajectory is drawn,so that the accident process trajectory and the vehicle speed are continuously output.Finally,using the developed video-based accident reproduction software to reproduce a real accident,simultaneously output the trajectory of the accident vehicle and the vehicle speed,and use PC-Crash accident reproduction software for calculation,compared with the calculation results obtained by the software designed by this study.The results prove that the calculation results of the software developed by this study are compared with the calculation results of PC-Crash,and the maximum relative error of vehicle speed and trajectory are within 5%,which proves the effectiveness of the software.