The biggest role of intelligent transportation is identification and analysis. Image recognition technology is a technology that humans use computer to analyze and understand real images. Studying this technology is of great significance for promoting social progress and human development. Over the years, people have made remarkable achievements in the field of image recognition, and successfully applied this technology in people's daily lives. The applications in ITS are very broad, including road identification, obstacle detection, vehicle detection, license plate recognition and vehicle identification.
The automatic identification of license plate is one of the important research directions of image recognition technology in the field of intelligent transportation, and it is an important link to realize intelligent traffic management. In the license plate recognition system of high-definition video technology, the video full-area dynamic detection and tracking technology is the most advanced technology for intelligent traffic computer operation. It is used for all vehicles or objects moving in different directions and at different speeds in different regions. Different types of complex detection, using improved filtering methods for tracking, and then comprehensive techniques for complex traffic rules for traveling trajectories or objects. Usually, this is a combination of frame rate difference detection and license plate detection and recognition. It can be used to track the vehicle's travel trajectory, so that the vehicle can be judged in straight, left, and right directions.
Smart license plate recognition parking is popular
"'The parking time is 2 hours, the charge is 6 yuan.' I have been driving for so many years and have been to hundreds of parking lots. This parking lot is the most intelligent and user-friendly parking management system I have ever seen." Expressed to. The parking lot mentioned by Mr. Zhang is located beside the South Second Ring Bridge in Xi'an. There are more than 540 parking spaces, which are open 24 hours. The Wentong Express No. Intelligent License Plate Recognition System is used. The vehicles entering and exiting this parking lot have no manual. Registering license plates does not require parking cards, but is free to move in and out. The efficiency of entering and leaving the parking lot is very high.
I believe that everyone has the same parking experience. Traffic jams on the road are very upset. Many times they have to queue up in the parking lot, and some parking lots use manual recording license plate timing, which is time-consuming and laborious and sometimes inaccurate. China's automobile industry has developed to today, the number of car ownership has soared, and the parking charge management has been put tough test. The use of smart license plate recognition technology to achieve safe and efficient charge management will become the main development direction of the parking management industry.
For the parking lot, the license plate number is the only “ID card†of the vehicle. Both the parking lot and the parking lot need to identify the license plate quickly and effectively. The traditional card swipe and manual identification recording operation is not only slow, the error rate is high, and the system management is more time consuming. Laborious, but also invisibly make the waiting car owners more annoying. When the vehicle enters the parking lot using the smart license plate recognition system, the system quickly recognizes the license plate through the camera and automatically takes a picture, and realizes the automatic lifting of the shift lever, without the need to swipe the card to take the card; when the parking lot is out, the camera automatically recognizes the license plate number. By comparing with the system whitelist, if it is a fixed vehicle, the gate will automatically lift the lever. If it is a temporary vehicle, the system will automatically calculate the fee. After paying the fee, the lever will be released for one or two seconds to automatically complete the vehicle identification. The entire process of vehicles entering and leaving the parking lot does not require manual operation, which greatly reduces our workload, while the management efficiency is significantly improved,†said Miss Zhao, the parking fee collector.
License plate recognition technology is applied in three major areas:
1. Parking lot and community entrance and exit
The application 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, access time, and realize automatic management of the vehicle, so as to save manpower and improve efficiency; for example, it can be automatically used to identify the entering vehicle in the intelligent community. Whether it belongs to the community, automatic timing charging for non-internal vehicles. In some units, this application can also be combined with the vehicle dispatching system to automatically and objectively record the vehicle's exit situation.
It is very difficult to manually record the license plate number and stop time of the vehicle and the entrance and exit management of the parking lot and the community. It will not only make mistakes, but also require a lot of manpower. A small license plate recognition device installed in the entrance and exit of the parking lot can solve many problems "once and for all". It can also analyze and identify the license plate being blocked, the paint is broken, and the blur is unclear, which saves many troubles for the parking lot and the entrance and exit staff.
Second, highway toll station
At present, the development of expressway construction in China has developed by leaps and bounds. The expressways extend in all directions. Each exit has a toll station. On the one hand, it is convenient for charge management. On the other hand, it can also assist the traffic police to regulate the traffic on the expressway. The application of the license plate recognition technology at the entrance and exit of the highway toll station can greatly facilitate the traffic police to identify the number plate information of the illegally-traveled vehicles and effectively manage and arrest some illegal vehicles.
The toll gates are generally located in an open-air environment, and some vehicles travel faster, so the requirements for license plate recognition technology are very high. The traditional license plate recognition is for the license plate of 160P pixels. The effective image range is small, and the license plate miss rate is high, which can not meet the needs of the toll station bayonet. Now the application of high-definition license plate recognition solves the problem of low recognition rate of previous license plates, which provides a reliable basis for the enforcement of public security and traffic police.
A license plate recognition system is installed at the entrance and exit of the toll booth. When a vehicle enters, the system recognizes the vehicle license plate and transmits the identified license plate information to the designated central management server, and compares with the license plate information of the stolen vehicle in the database. It can be judged whether the vehicle entering the entrance and exit of the expressway toll gate is a suspicious vehicle, which can greatly avoid the occurrence of illegal crimes and provide reference information for the incidents that have occurred.
Third, the application in the highway bayonet
Along with the increase in the construction of highway mileage in China, the overall improvement of people's living standards, and now more and more people buy cars, causing various illegal problems for the road. As the necessary basis for vehicle illegal punishment, license plate recognition technology can automatically detect and identify the vehicle number plate in the video. The most typical one is the security bayonet system. If there is no license plate recognition technology, there is no real intelligent intelligence. .
A perfect security management system should have three main functions: automatic license plate recognition, bayonet application system and central management platform. License plate recognition is one of the most important parts. The quality of license plate recognition directly affects the overall performance of the bayonet system, and recognition speed is one of its most important technical indicators. The recognition speed is fast, the system needs to occupy less system resources, the possibility of manual intervention is small, and the operating load of the system network is correspondingly reduced. The license plate recognition speed is fast and accurate, and the license plate recognition system can effectively realize the automatic comparison alarm to avoid a large number of false alarms. It can provide powerful and reliable information for crime detection, such as anti-theft vehicles, deck vehicles, illegal robbery vehicles, etc.
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