Research On Around View Monitor System For Commercial Vehicles

Commercial vehicles are the most popular,convenient and effective transportation carriers.It gives people the convenience also brought a lot of trouble.The difficult problem of commercial vehicles parking has become increasingly serious.In order to let an inexperienced driver smooth and safe completion of parking in narrow spaces,more and more consumers are concerned about parking assist system products.AVM can improve the efficiency and safety of car parking.Most of the AVM products on the market are installed in the small cars,SUVs and passenger cars.But the basic for blank installed on commercial vehicles.So this thesis provides an applied to commercial vehicles on the AVM and fisheye cameras installation methods.In terms of the characteristics and dynamics of the commercial vehicles parking,analyzes the performance requirements of AVM.According to two carriages and more than two carriages of commercial vehicles,this thesis designs the overall scheme of the commercial vehicles AVM system.Fisheye cameras installation in car concrete experimental analysis in detail,including fisheye cameras at length,the width of the commercial vehicles position.The main axis of cameras in the up and down,left and right sides offset range.Establish interested area around in commercial vehicles,obtain the main axis of cameras in the up and down offset angle and the optimization of the relationship between installation altitude.In addition,the algorithm for the commercial vehicles AVM is optimized.Commercial vehicles have two or more than two carriages profile image stitching line were determined.Specific for two carriages of commercial vehicles,commercial vehicles steering wheel to play to the limit to determine the carriages left and the right of the stitching lines,respectively.For more than two carriages of commercial vehicles,this thesis adopts the method of convex side judgment get car ownership information of each pixel,and install an angle sensor in each size to get the angles between each carriage.Through mathematical model calculations show that the relationship between the actual pixels panorama and pixels of the first splicing.To achieve the panoramic display of commercial vehicles steering.Also this thesis designed a map on commercial AVM of multi-compartment multi-camera,so as to satisfy the requirement of real-time commercial vehicles AVM.Finally,because the commercial vehicles special structure and loading form are easy to cause each camera exposure difference.This thesis proposes a global brightness control method,this method has a good effect for the global brightness adjustment by Matlab.This thesis combining with the characteristics of AVM and the realistic requirement of the system are installed on commercial vehicles,AVM installed on commercial vehicles optimization scheme is established.For the system installed on commercial vehicles in the future provide many of the proposals.