The emergence of intelligent license plate recognition system not only solves the problems that can not be solved by the traditional parking system, but also adds the functions that the traditional parking system does not have, which can not be achieved by the traditional parking system. Intelligent license plate recognition system is generally composed of cloud parking access camera, intelligent gate, intelligent gateway, parking management server, cloud platform software, etc. According to the management requirements of buildings in various places, the system can implement automatic identification, access control, monitoring, parking guidance, parking billing, equipment automatic management and other comprehensive services for the vehicle entrance of the garage (yard), and become an organic part of the parking lot anti-theft system. It realizes a series of complete and fully automatic functions, such as rapid automatic vehicle identification, entry, rapid parking, rapid vehicle search, rapid payment and so on.

License plate recognition technology is a combination of image recognition, cloud computing and other technologies, which is used for vehicle identification in the parking lot. Although the traditional IC / ID card collection method seems to be a simple action, when the traffic flow is large, it will cause congestion at the entrance and exit of the parking lot, bring inconvenience to people's parking and waste a lot of parking time; The capacity of the card in the ticket box of the parking lot is limited, so the parking lot management personnel need to keep placing cards in the ticket box. For the car owner, the card is often lost due to improper storage of the card. Once the card is lost, the whole parking record cannot be checked, which brings some trouble to the parking lot management.

When license plate recognition is applied in the parking lot system, it will bring more convenience to the parking lot: for some fixed places, managers only need to input the vehicle information into the system in advance. When vehicles enter and leave the parking lot, the parking lot gate can realize the automatic opening function. For some foreign vehicles, it is necessary to manually manage the entry and exit of vehicles, This ensures the parking safety of vehicles. For some large parking lots like the commercial center, the entrance can be set to allow vehicles to enter the parking lot as long as the license plate information of vehicles can be recognized, and the vehicles can be released manually according to the entry information when leaving the parking lot, so that there is no need for personnel management at the entrance and vehicles can enter the parking lot automatically.

Due to the fast recognition speed, the vehicle owner can enter the parking lot in less than 1 second without going through cumbersome steps such as opening the door and picking up the card. It is simple and convenient.

License plate recognition is an automatic pattern recognition technology for license plate number and license plate color by collecting dynamic video or static images of vehicles. The core of the technology includes license plate location algorithm, license plate character segmentation algorithm and optical character recognition algorithm. A complete license plate recognition system should include vehicle detection, image acquisition, license plate recognition and so on. The parking lot can realize the automatic timing and charging of vehicles by installing the license plate recognition equipment at the exit, recording the license plate number and access time of vehicles, and combining with the control of automatic door and railing machine. When the vehicle detection section detects the arrival of the vehicle, it triggers the image acquisition unit to acquire the current video image. The license plate recognition unit processes the image, locates the license plate position, segments the characters in the license plate for recognition, and then forms the license plate number output. Compared with the traditional card collection and admission, the license plate recognition is free of parking and window opening, which improves the b-end user experience, reduces the cost of IC card loss and consumption in the parking lot, improves the traffic efficiency of C-end owners, and realizes the fast access of vehicles to and from the parking lot.

The key to the advantages and disadvantages of all-in-one license plate recognition machine is the recognition rate. Because the collected license plate images are diverse, and the images are affected by many factors, such as smoke and fog, rain and snow, different angles of sunlight and so on, license plate recognition is facing great challenges. However, with the development of technology, these problems are being gradually solved. The license plate recognition camera can adopt wide dynamic CMOS, local exposure based on license plate, fill light technology controlled by image algorithm, etc., which can automatically track light changes and effectively suppress forward and backward light. Especially at night, it can suppress the interference of car headlights, so as to clearly capture license plates, Then, the recognition rate is as high as 99.7%, ranking first in the industry. Of course, the high recognition rate is closely related to the license plate recognition algorithm. For example, Wentong technology intelligent license plate recognition all-in-one machine adopts the independently developed PC version algorithm, which is specially developed for the parking environment. It is suitable for the characteristics of slow speed, large angle and short recognition distance in the parking lot, especially the large angle, which is not available in other application scenarios.

The all-in-one license plate recognition machine is an important part of the parking lot intelligent management system, which is composed of license plate recognition, camera, front-end storage, fill light and so on. In practical application, the intelligent license plate recognition all-in-one machine captures images through the camera, automatically identifies the license plate number, license plate color, judges the vehicle type, records the entry and exit time and other information of the vehicle, and combines it with the control equipment of automatic door and railing machine to realize the automatic management of the vehicle. The equipment applied in the parking lot can not only realize automatic timing and charging, but also automatically calculate the number of available parking spaces and give tips, so as to realize the automatic management of parking charging, save manpower and improve efficiency. At the same time, it can also effectively maintain the order of the parking lot. Internal vehicles can enter and leave without parking, while external vehicles only need to pay for entering and leaving the site, without cumbersome processes such as card / ticket collection.