On the Principle and Application of License Plate Recognition in Parking Lot System

Nowadays, with the gradual expansion of urban car users, many road intersections or parking lots have adopted intelligent license plate recognition technology, and the most prominent performance is that it is used in parking lots. Now many communities, commercial squares, shopping centers, airports and other major parking lots have been transformed successively, From the previous traditional card swiping parking lot system to the intelligent license plate recognition parking lot system, what are the principles and applications of license plate recognition in the parking lot system? Let's have a look. I. working principle of license plate recognition in parking lot system 1. Vehicle viewing: various methods such as buried coil viewing, infrared viewing, radar viewing technology and gate video viewing can be used to perceive the passing of vehicles and trigger image collection and capture. 2. Image collection: real time and uninterrupted recording and collection of passing vehicles through HD camera capture host. 3. Preprocessing: noise filtering, automatic white balance, automatic exposure, gamma correction, edge enhancement, contrast adjustment, etc. 4. License plate location: scan the army on the gray image after image preprocessing to determine the license plate area. 5. Character cutting: after the license plate area is located in the image, the character area is accurately determined through gray-scale gate and binarization, and then the character is cut according to the character scale characteristics. 6. Character recognition: the cut characters are scaled and feature extracted to match with the standard character expression in the character database template. 7. Effect output: output the effect of license plate recognition in text format. II. Four applications of license plate recognition in parking lot system 1. The application of license plate recognition technology in parking lot and community entrance and exit parking lot and community entrance and exit is mainly used to record the license plate number, license plate color and access time of vehicles, and complete the automatic processing of vehicles, so as to save manpower and forward power; For example, when applied to an intelligent community, it can automatically distinguish whether the incoming vehicles belong to the community, and automatically time and charge the gate for Non internal vehicles. In some units, this application can also contact with the vehicle dispatching system to automatically and objectively record the departure of their vehicles.

It is very difficult to manually record the license plate number and parking time of traffic vehicles at the entrance and exit of parking lot and community. Not only will there be errors, but also a lot of manpower needs to be invested. A small license plate recognition equipment can deal with many questions at the entrance and exit of the parking lot. It can also be analyzed and identified that the license plate is blocked, paint falling, cracking and blurring, so as to save many troubles for the staff at the parking lot and entrance and exit. 2. Expressway toll station at present, the construction of Expressway in China is developing rapidly. The expressway is unobstructed. Toll stations are set at each exit, which is convenient for toll processing on the one hand, and can also help the traffic police deal with the traffic on the expressway in a standard way on the other hand.

The application of license plate recognition technology at the entrance and exit of expressway toll station can greatly facilitate the traffic police to identify the number plate information of illegal trekking vehicles, and effectively deal with and arrest some illegal vehicles. The toll gate is generally located in the open environment, and some vehicles travel fast, so the request for license plate recognition technology is very high. The traditional license plate recognition is about 160p pixel license plate recognition. The useful image planning is small and the license plate missing rate is high, which can not meet the needs of the times of toll station bayonet. Now the application of high-definition license plate recognition has solved the problem of low license plate recognition rate, which provides a reliable basis for the laws of public security and traffic police. In the license plate recognition system at the entrance and exit of the toll station, when a vehicle enters, the system recognizes the vehicle license plate and sends the recognized license plate information to the designated base processing server, By comparing with the license plate information of the stolen and robbed suspicious vehicles in the database, we can judge whether the road gate vehicle driving into the entrance and exit of the expressway toll station is a stolen and robbed suspicious vehicle, which can greatly avoid the occurrence of illegal incidents and provide reference information for the work that has occurred. 3. With the increase of highway distance in China and the overall progress of people's living standards, the number of people buying cars is increasing, which poses all kinds of illegal questions to the highway.

As a necessary basis for illegal punishment of vehicles, license plate recognition technology can automatically view and recognize the vehicle license plate in the video. The most typical is the public security checkpoint system. The system assumes that without license plate recognition technology, there is no real intelligence. A perfect security checkpoint processing system should have three primary functions: automatic license plate recognition, checkpoint application system and base processing of canals. License plate recognition is the most important part.

The quality of license plate recognition directly affects the overall function of bayonet system, and the recognition speed is its most important technical index. The identification speed is fast, the system resources occupied by the system requirements are less, the possibility of manual intervention is less, and the work burden of the system network is reduced accordingly. License plate recognition is fast and accurate. License plate recognition system can effectively complete automatic comparison alarm and avoid many false alarms. It can provide powerful and reliable case solving information for anti-theft vehicles, fake vehicles, illegal seizure of vehicles and other illegal cases. 4. In recent years, with the rapid development of social economy and the rapid growth of the number of motor vehicles, the road traffic has become busier and busier.

The hostility between the current situation and demand of traffic treatment has further intensified, and traffic related criminal and public security cases have also increased year by year. In this case, how to use the preemptive scientific and technological means to strengthen the investigation and control of motor vehicles and drivers in the city by the public security processing part, and provide scientific and technological means to impact all kinds of illegal acts is an urgent question for the public security traffic processing part. Nowadays, the license plate recognition parking lot system is considered to be a set of car parking management system which is more convenient for management and fast traffic. Because it has the advantages of high recognition rate and fast traffic, it is favored by many users. However, car park car park car system is constantly upgrading and functions are increasing.

In order to better manage parking lots and parking problems, the license plate recognition technology is certainly not backward. License plate recognition system will inevitably have huge market and prospect in the Internet plus era trend, and it will also bring convenience to car park system management. Tigerwong parking equipment supplier has focused on parking equipment for many years! If you have any questions about the parking system, welcome to consult and communicate.