A Study Of Surveying And Mapping Accident Scene Elements Based On Geometric Corrected Images

With the rapid development of the national economy in recent decades, China’s vehiclepopulation rapidly increases, so does the road traffic flow. The road traffic environment is inworse conditions, the lower driver’s quality and poor traffic management, resultingfrequently in road traffic accidents. It does not only threaten the safety of people, but alsocause huge economic losses, having become a social hazard over the world.At present, the traffic accident scene diagram is drawn mainly by hand, supplementedby site photos and videos. Manual drawing method not only has large workload and lowprecision, but also may causes secondary traffic accident since it takes up a lot of time. Theimprecision and inefficiency of the traditional traffic accident scene investigation measuringmethod could cause the chain reaction and lead to more indirect economic losses. Domesticand foreign experts have taken the photogrammetry technology and image processingtechnology into the accident site survey in order to meet the requirements of traffic accidentinvestigation. In recent years, new technologies and methods are used in the analysis ofaccident scene, such as Total Station, GPS, Laser measuring device and so on. Althoughthese new methods and new technology have played a positive role in improving theefficiency and automation of the accident scene investigation, however, due to high price ofequipments and inconvenience to carry, they are difficult to be widely applied. In responseto these issues, this thesis aims to study on surveying and mapping accident scene based ongeometric correction images, which can shorten the time of surveying and mapping accidentscene, improve the quality and lessen workloads.Based on the image processing technology, focus on the research of the imagetwo-dimensional geometric correction processing technology. According to thecharacteristics of road traffic accident scene, determine the two-dimensional imagecorrection methods. Its purpose is to transform the perspective photo images of the accidentscene into orthogonal projection image. According to the camera’s pinhole imagingprinciple, the thesis builds the image two-dimensional geometric correction model anddeduces the linear transformation equation of two coordinate systems. Obtain the spatiallocation coordinates of the calibration points quickly by the four-point positioning method, get the image location coordinates of the calibration points through mouse point, thusreconstruct the scene of the accident, reflects the distance between each element of theaccident scene directly. For large scene of traffic accident, the thesis provides a solution bytaking pictures piecemeal and stitching the correction images to get a complete accidentscene.The surveying and mapping technology of the accident scene was focused on in orderto rapidly survey the traffic accident, rely on the subject "Quick survey and disposaltechnology for serious traffic accidents", research and development of traffic accident scenemapping program. Select the appropriate application development tools. Design the overallstructure, main functions and data structures of the program according to the designprinciples. Then illustrate the work process and operational approach, and describe thedetailed design processes at last.Design tests on the basis of the actual situation of traffic accident, checking the validityof geometric correction model and the feasibility of images stitching method.Design simulation scene of the accident to test the accuracy of the program at minimalinfluence of the error of corrected image and other external interferences. Verify thefeasibility, operability and accuracy of the program by practical application. And analyzefactor’s errors in detail.