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License plate recognition is widely used in the management of highway vehicles. In the Electronic Toll Collection (ETC) system, it is also the main means to identify vehicle identities in conjunction with DSRC technology. 
In the parking lot fee management system, license plate recognition technology is also the main means to identify the vehicle's identity. In the Technical Requirements for the Collection and Transmission System of Vehicle Images and Number Plates for Parking Garages (Field) Constructed by the Shenzhen Municipal Bureau, [1] license plate recognition technology has become the main means for vehicle identification.
The license plate recognition technology combines with the electronic toll collection system (ETC) to identify vehicles. When passing vehicles pass through a crossing, there is no need to stop, that is, automatic identification of vehicles and automatic charging can be realized. In the yard management, in order to improve the efficiency of the entrance and exit vehicles, the Dragonfly Technology Intelligent Traffic Management System aims to build an unattended expressway for vehicles that do not need to collect parking fees (such as monthly trucks and free-of-charge internal vehicles) to exempt cards and stop parking. The access experience is changing the management mode of entering and leaving the parking lot. 
Here are some examples of applications:
——Monitoring alarms For vehicles that are included in the “black listâ€, such as vehicles that have been reported or reported missing, underpayment vehicles, vehicles that do not have annual inspections, accidents escaping and illegal vehicles, etc., simply enter their license plate number into the application system. The license plate recognition device is installed at a designated intersection or bayonet or is carried by law enforcement personnel as needed. The system will read all the license plate numbers of the passing vehicles and compare them with the “black list†in the system. Once the designated vehicle is detected, an alarm will be issued immediately. information. The system can work uninterrupted throughout the day, without fatigue, with a very low error rate; it can adapt to high-speed vehicles; it can complete tasks in the vehicle without affecting normal traffic; the driver will not be aware of the entire monitoring process and high confidentiality. . Applying such a system will greatly increase the efficiency of law enforcement.
- Speeding violation of license plate recognition technology combined with speed measurement equipment can be used for vehicle speeding violation punishment, generally used in highways. The specific applications are: setting speed monitoring points on the road, capturing speeding vehicles and identifying license plate numbers, sending license plate numbers and pictures of illegal vehicles to various exits; setting penalties at each exit, using vehicle number plate recognition devices to identify passing vehicles and adding numbers Compare with the number of speeding vehicles that have been received. Once the numbers are the same, an alert device is activated to notify law enforcement officers. Compared with traditional speed monitoring methods, this application can save the police force, reduce the work intensity of law enforcement personnel, and it is safe, efficient, and hidden. The driver must always remind himself that he can not speed, and greatly reduce the accident caused by speeding.
——Vehicle access management The license plate recognition equipment is installed at the entrance and exit, records the license plate number and the access time of the vehicle, and is combined with automatic door and barrier control equipment to realize the automatic management of the vehicle. Applied to the parking lot can realize automatic time-based charging, and can also automatically calculate the number of available parking spaces and give hints. The automatic parking fee management can save manpower and improve efficiency. The application to the smart community can automatically determine whether the entry vehicle belongs to the local cell and implement automatic timing and charging for non-interior vehicles. In some units, this kind of application can also be combined with the vehicle dispatching system to automatically and objectively record the vehicle's outbound condition. Longxuan's intelligent traffic management system uses license plate recognition technology to achieve no stopping and exemption of cards. Effectively improve the efficiency of vehicle access.
- Automatic release of the specified license plate information into the system, the system automatically read through the vehicle's license plate and query the internal database. For vehicles that need to be automatically released to drive electronic gates or barriers to allow them to pass, warnings will be given to other vehicle systems and handled by on-duty personnel. Can be used for special units (such as military administrative areas, confidential units, key protection units, etc.), road and bridge charge bayonet, and advanced residential areas.
—— Freeway toll management installs license plate recognition equipment at various entrances and exits of highways. When the vehicle enters, it recognizes the vehicle license and stores the entrance data into the toll collection system. When the vehicle arrives at the exit, it recognizes its license plate again and invokes the entrance data according to the license plate information. Information to achieve charge management. This application can realize automatic billing and can prevent cheating, thus avoiding the loss of receivables.
Expressway has begun to implement networking fees. With the expansion of the scope of networking, the difference between the price of different types of vehicles is also getting higher and higher. Drivers using existing loopholes in the system will use the loopholes in the existing toll collection system to avoid evading fees. License plate recognition technology is the fundamental method to solve such problems.
- Calculation of vehicle travel time In the traffic management system, the average travel time of a vehicle on a road can be used as a parameter for judging the road congestion condition. The license plate recognition equipment is installed at the start and end points of the road, and all passing vehicles are read and the license plate number is transmitted back to the traffic command center. Based on these results, the command center management system can calculate the average travel time of the vehicle.
- Automatic registration of license number The traffic supervision department handles a large number of illegal vehicle pictures every day. Usually, the number of the license plate is manually identified and then input into the management system. This method has a large workload and is prone to fatigue and misjudgment. Using automatic identification can reduce work intensity and can greatly increase processing speed and efficiency. This feature can be used for electronic * systems, road monitoring systems.
The license plate recognition car park management system automatically recognizes and converts the vehicle license plate number image captured by the camera at the entrance into a digital signal. To achieve one card and one vehicle, the advantage of license plate recognition is that it can associate the card with the car, so that the management can be improved by one grade. The corresponding advantages of the card and the car are that the long-term card must be used in conjunction with the car to eliminate the use of one card and multiple vehicles. Vulnerabilities improve the benefits of property management; at the same time, they automatically compare incoming and outgoing vehicles to prevent theft. The upgraded camera system can collect clearer pictures and save them as files, which can provide strong evidence for disputes. It facilitates management personnel to compare the vehicles when they appear on the market, which greatly enhances the security of the system.
The auto license plate recognition technology is a pattern recognition technology that uses the dynamic video or static image of the vehicle to automatically identify the license plate number and license plate color. Through the collection and processing of images, the automatic license plate recognition function is completed. The license plate image can be automatically extracted from an image, and the characters are automatically segmented to further identify the characters. The hardware basis generally includes the trigger device (monitoring whether the vehicle enters the field of view), Camera equipment, lighting equipment, image acquisition equipment, identification number processor (such as computers).
In the era of smart parking fees, do not want to escape the “eye†of the license plate recognition system.
The license plate recognition technology can extract and identify the license plates in motion from complex backgrounds, and identify vehicle license plate numbers through technologies such as license plate extraction, image preprocessing, feature extraction, and license plate character recognition. The current technology level is alphabetical and numerical. The recognition rate can reach 98.9%, and the recognition rate of Chinese characters can reach 97.9%.