Detailed explanation of the working principle of the license plate recognition parking system

Vehicle License Plate RecogniTIon (VLPR) is an application of computer video image recognition technology in vehicle license plate recognition. License plate recognition is widely used in highway vehicle management. In the electronic toll collection (ETC) system, it is also the main means to identify the identity of vehicles in combination with DSRC technology.

The license plate recognition technology requires that the sports license plate can be extracted and recognized from the complex background, and the vehicle license plate, image pre-processing, feature extraction, license plate character recognition and other technologies are used to identify the vehicle grade, color and other information, and the latest technical level. The recognition rate for letters and numbers can reach 99.7%, and the recognition rate for Chinese characters can reach 99%.

In parking lot management, license plate recognition technology is also the main means of identifying vehicle identity. In the "Technical Requirements for Vehicle Image and Number Plate Information Collection and Transmission System of Parking Garage (Field)" constructed by Shenzhen Public Security Bureau, license plate recognition technology has become the main means of vehicle identification.

The license plate recognition technology is combined with the electronic non-stop toll collection system (ETC) to identify the vehicle. When the passing vehicle passes through the crossing, there is no need to stop, that is, the vehicle identity can be automatically recognized and automatically charged. In the management of the yard, in order to improve the traffic efficiency of the entry and exit vehicles, the license plate recognition is for vehicles that do not need to collect parking fees (such as monthly trucks, free internal vehicles), and build an unattended fast-track, free of access and non-stop access experience. Change the management mode of access to the parking lot.

Nowadays, with the increasing number of urban car users, many roads or parking lots have adopted smart license plate recognition technology, and the most outstanding performance is the use in parking lots. Now many communities, commercial plazas, shopping centers, airports, etc. The major parking lots have been transformed successively. From the traditional traditional card parking system to the smart license plate recognition parking system, what are the principles and applications of license plate recognition in the parking system? Let’s take a look.

1. Vehicle view: You can use the buried coil view, infrared view, radar view technology, gate view video and other methods to perceive the passage of the vehicle and trigger image capture and capture.

2, image collection: through the high-definition camera capture host to the real-time, uninterrupted record and collection of vehicles.

3. Pre-processing: noise filtering, automatic white balance, automatic exposure and gamma proofreading, edge enhancement, contrast adjustment, etc.

4. License plate location: Force scanning is performed on the gray image after image preprocessing, and the license plate area is determined.

5. Character cut: After the license plate area is located in the image, the digitized gate gate, binarization and the like are processed to finely determine the character region, and then the character cut is performed according to the character scale feature.

6. Character recognition: The character after the cut is scaled and extracted, and the standard character expression form in the character database template is matched.

7. Effect output: The effect of license plate recognition is output in text format.

The use of parking lot and community entrance and exit license plate recognition technology is mainly used to record the vehicle license plate number, license plate color, entry and exit time, and complete the automatic processing of the vehicle in order to save manpower and forward power; for example, it can be automatically differentiated into the vehicle when used in a smart community. Is it due to the community, the automatic timing of the non-internal vehicles is completed. In some units, this application can also be in contact with the vehicle dispatching system to automatically and objectively record the vehicle's departure status.

Parking lot and community entrance and exit processing It is very difficult to manually record the license plate number and stop time of the vehicle. It is not only wrong, but also requires a lot of manpower. A small license plate recognition device can handle many questions "in one hundred" at the entrance and exit of the parking lot. The license plate is blocked, the paint is cracked, the blur is unclear, etc. It can also be analyzed and identified, saving a lot of troubles for the parking lot and the entrance and exit staff.

Nowadays, China's expressways have been built for a long time, and the expressways are unimpeded. Each exit has a toll station. On the one hand, it is convenient for charging, and on the other hand, it can help the traffic police to standardize the traffic on the expressway. The use of license plate recognition technology at the entrance and exit of highway toll stations can greatly facilitate the traffic police to identify the number plate information of vehicles that violate the regulations, and to perform useful treatment and arrest on some illegal vehicles.

The toll booth bayonet is generally located in an open air environment, and some vehicles have a faster trek, so the request for license plate recognition technology is very high. The traditional license plate recognition is about the recognition of the license plate of 160P pixels. The useful image planning is small, and the license plate miss rate is high, which cannot meet the needs of the toll station bayonet. Now the use of high-definition license plate recognition has dealt with the problem of low recognition rate of license plates, thus providing a reliable basis for the law of public security and traffic police.

At the toll gate entry and exit equipment license plate recognition system, when a vehicle enters, the system recognizes the vehicle license plate and transmits the identified license plate information to the designated base processing server, and compares with the license plate information of the stolen vehicle in the database. It can be discriminated whether the vehicle that enters the entrance and exit of the highway toll station is a smuggling of suspicious vehicles, which can greatly avoid the occurrence of illegal and illegal incidents and provide information on the work that has already occurred.

With the increase in the roads created by China and the overall advancement of the people's living standards, the number of people buying cars is increasing, posing a variety of illegal doubts for the roads. As a necessary basis for illegal vehicle disposition, license plate recognition technology can automatically view and identify the vehicle number plate in the video. The most typical one is the security bayonet system. The system assumes that there is no license plate recognition technology, there is no real intelligence. Turn.

A perfect security bayonet handling system should have three primary functions: automatic license plate recognition, bayonet application system and base processing channel. License plate recognition is the most important part of it. The quality of license plate recognition directly affects the overall function of the bayonet system, and the recognition speed is its most important technical indicator. The recognition speed is fast, the system resources occupied by the system requirements are small, the possible barriers of manual intervention are small, and the work load of the system network is correspondingly reduced. The license plate recognition speed is fast and accurate, and the license plate recognition system is useful to complete the automatic comparison alarm to avoid many false positives. It can provide powerful and reliable information for the burglar-proof vehicles, deck vehicles, illegally plundering vehicles and other illegal cases.

In recent years, following the rapid development of the social economy, the rapid increase in the number of motor vehicles has increased, and road transportation has become more and more busy. The hostility of the current situation and demand for traffic has further intensified, and criminal and public security cases related to transportation have also increased year by year. Under this circumstance, how to use the preemptive scientific and technological methods to enhance the investigation and control of motor vehicles and drivers in the city by the public security processing section, and to supply scientific and technological methods for all kinds of illegal and illegal acts, is an urgent need for public security traffic processing. .

Nowadays, the license plate recognition parking lot system is currently considered as a parking lot management system which is more convenient for management and faster vehicle traffic. Because of its advantages of high recognition rate and fast traffic, it has been favored by many users. However, in order to better manage the parking lot and the difficulty of parking, the parking lot system is constantly upgrading, and the functions are also increasing. Of course, the license plate recognition technology cannot be lagging behind. The license plate recognition system will have a huge market in the current era of Internet+. And the prospects will also bring a lot of convenience to the management of the parking lot system.

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