The Design And Implementation Of The Lane Departure Warning System Based On Image

With the length of highways on operation increase and automobile quantity increasing by,the casualties that the road accident leads to and the quantity losing also rise rapidly.Have among them very large proportion is that the lane brings about b ecause the driver fatigue or distraction of their mind leads to the vehicle departure.The lane deflection early warning system can reduce the lane departure from the accident,which is the focus of the research and development of the whole world.The topic of this paper is the design and implementation of the lane departure warning system based on image.The main work includes the following aspects:In the lane deflects warning system,Identification and accurate to obtain road information is the premise a nd basic of ensuring accurate early warning.The paper offered a set of processes to extract the lane According to the characteristics of the image itself and the structure of the road.First,using Image enhancement and edge detection makes edge feature highlighted.Then use Hough transform to detect lane marking which the lane deflects warning system needs.In order to reduce the unnecessary computation and improve the real time performance of the algorithm,this paper establishes a sensitive area before Hough transform.O nly the lane in the region will be identified.In the lane departure decision part,the advantages and disadvantages of the lane departure decision algorithm without camera calibration are analyzed and compared.Finally,the algorithm without camera calibration is selected.The algorithm mainly uses the relative relationship between the lane coordinates and the vanishing point to realize the lane departure decision.Therefore,it is not necessary to calibrate the camera,and the computational complexity is lower.Considering the lane departure decision system is running in a vehicle holding computer system less similar to the resources available in the embedded computer,the paper chooses Linux as the developing and running environment,and make full use of the existing Open CV library and QT application framework to design and realize the system.After the performance bottleneck of the program is analyzed and measured,some common effective solutions including low cost instruction substitutio n,loop unrolling,multithreading are used to optimize the performance of the lane departure warning system when the code development completed.