Talking about the technology of Chongqing smart license plate recognition system
2023-12-05 14:09:29
License plate recognition is a pattern recognition technology that uses the dynamic video or static image of the vehicle to automatically recognize the license plate number and license plate color. The core of the technology includes license plate location algorithm, license plate character segmentation algorithm and optical character recognition algorithm.
How license plate recognition technology works
Vehicle detection: Buried coil detection, infrared detection, radar detection technology, video detection and other methods can be used to sense the passing of the vehicle and trigger image acquisition and capture.
Image acquisition: Real-time, uninterrupted recording and collection of passing vehicles through the high-definition camera capture host.
Pre-processing: noise filtering, auto white balance, auto exposure and gamma correction, edge enhancement, contrast adjustment, etc.
License plate location: Perform a row and column scan on the grayscale image after image preprocessing to determine the license plate area.
Character segmentation: After the license plate area is located in the image, the character area is precisely positioned by graying, binarization, etc., and then the character segmentation is performed according to the character size feature.
Character recognition: The segmented characters are scaled, feature extracted, and matched with the standard character expressions in the character database template.
Result output: The result of license plate recognition is output in text format.
License Plate Recognition <br> <br> a four applications, and application of parking entrance cell and cell entrance parking license plate recognition technology, mainly used for recording the license plate number of the vehicle, plate color, access time, automatic management of the vehicle In order to save manpower and improve efficiency; for example, the application to the intelligent community can automatically determine whether the entering vehicle belongs to the local community, and realize automatic time 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 departure status.
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 stations At present, China's highway construction and development has made rapid progress, highways extend in all directions, each exit has a toll station, on the one hand to facilitate charge management, on the other hand can also help traffic police to regulate traffic on the highway management. 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 the previous license plate, 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 station 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 is accompanied by the increase of highway mileage construction in China, the overall improvement of people's living standards, and now more and more people buy cars, causing various illegal problems for the highway. 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 solving crimes such as burglar-proof vehicles, deck vehicles, and illegal robbery vehicles.
IV. Application in Urban Transportation In recent years, with the rapid development of social economy and the rapid growth of the number of motor vehicles, road transportation has become more and more busy. The contradiction between the status quo and demand of traffic management has further intensified, and criminal and public security cases related to transportation have also increased year by year. Under this circumstance, how to use advanced scientific and technological means to enhance the public security management department's investigation and control of motor vehicles and drivers in the city, and to provide scientific and technological means for combating all kinds of illegal and criminal activities is an urgent problem for the public security traffic management department. .
In order to effectively curb the red light violations of vehicles in the city, various intersections in the city are now vigorously installing the detection system of bayonet-type red light illegal activities. The most important component of this system is the license plate recognition module. The license plate recognition system is mainly to determine the illegality. Vehicle information, by capturing the license plate information of all vehicles and comparing with the public security network database to analyze which vehicles are suspicious vehicles, reducing illegal activities can also control and reduce road traffic accidents, the application of road monitoring equipment combined with modern information network technology To form an intelligent network system for road monitoring, to better improve the dynamic management/control of roads and meet the business needs of new situations such as public security, criminal investigation and traffic management.
How license plate recognition technology works
Vehicle detection: Buried coil detection, infrared detection, radar detection technology, video detection and other methods can be used to sense the passing of the vehicle and trigger image acquisition and capture.
Image acquisition: Real-time, uninterrupted recording and collection of passing vehicles through the high-definition camera capture host.
Pre-processing: noise filtering, auto white balance, auto exposure and gamma correction, edge enhancement, contrast adjustment, etc.
License plate location: Perform a row and column scan on the grayscale image after image preprocessing to determine the license plate area.
Character segmentation: After the license plate area is located in the image, the character area is precisely positioned by graying, binarization, etc., and then the character segmentation is performed according to the character size feature.
Character recognition: The segmented characters are scaled, feature extracted, and matched with the standard character expressions in the character database template.
Result output: The result of license plate recognition is output in text format.
License Plate Recognition <br> <br> a four applications, and application of parking entrance cell and cell entrance parking license plate recognition technology, mainly used for recording the license plate number of the vehicle, plate color, access time, automatic management of the vehicle In order to save manpower and improve efficiency; for example, the application to the intelligent community can automatically determine whether the entering vehicle belongs to the local community, and realize automatic time 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 departure status.
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 stations At present, China's highway construction and development has made rapid progress, highways extend in all directions, each exit has a toll station, on the one hand to facilitate charge management, on the other hand can also help traffic police to regulate traffic on the highway management. 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 the previous license plate, 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 station 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 is accompanied by the increase of highway mileage construction in China, the overall improvement of people's living standards, and now more and more people buy cars, causing various illegal problems for the highway. 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 solving crimes such as burglar-proof vehicles, deck vehicles, and illegal robbery vehicles.
IV. Application in Urban Transportation In recent years, with the rapid development of social economy and the rapid growth of the number of motor vehicles, road transportation has become more and more busy. The contradiction between the status quo and demand of traffic management has further intensified, and criminal and public security cases related to transportation have also increased year by year. Under this circumstance, how to use advanced scientific and technological means to enhance the public security management department's investigation and control of motor vehicles and drivers in the city, and to provide scientific and technological means for combating all kinds of illegal and criminal activities is an urgent problem for the public security traffic management department. .
In order to effectively curb the red light violations of vehicles in the city, various intersections in the city are now vigorously installing the detection system of bayonet-type red light illegal activities. The most important component of this system is the license plate recognition module. The license plate recognition system is mainly to determine the illegality. Vehicle information, by capturing the license plate information of all vehicles and comparing with the public security network database to analyze which vehicles are suspicious vehicles, reducing illegal activities can also control and reduce road traffic accidents, the application of road monitoring equipment combined with modern information network technology To form an intelligent network system for road monitoring, to better improve the dynamic management/control of roads and meet the business needs of new situations such as public security, criminal investigation and traffic management.
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