Application Research Of Highway License Plate Recognition System

License plate recognition system of highway toll system is a very important link, the highway has been gradually used in not only reduced the burden of fees, but also provided a support for the operation and management units of split toll, special vehicle information query, etc., because of the license plate recognition system of the expressway due to working in the harsh environment of the all-weather, ordinary license plate recognition instrument in the all-weather, bad weather unable to meet normal requirements of the charging system, study and solve the influence the recognition rate of the factors and it is particularly important to solve.This paper first introduces the basic principle and technology of license plate recognition system hardware modules and the expressway license plate recognition system, the technical process of license plate recognition for vehicle detection license plate capture-license plate recognition-license plate pretreatment and character segmentation character recognition character output, and for each link are introduced; because of the special bad weather conditions and the license plate recognition system need to work around the clock, the recognition rate will be affected, the factors affecting the recognition rate is divided into internal environmental factors (algorithm, network problems, vehicle detector coil, etc.) and external factors (bad weather, illumination, license plate, according to the different factors of fouling) effect, put forward the solution to the problem, to improve the recognition rate has certain effect.Finally, in view of the highway toll system function of a single, unable to meet the requirement of charging management unit, put forward in the existing toll collection system with license plate recognition system to increase the functional module, such as black list module, free car module, pour card vehicle module and so on, needle of different can module could achieve in toll lane is verified by experiment, the experiment verified the system extended the feasibility of functional modules, with the certain practical application value, has a certain reference role to upgrade the future Lane software system.