According to the definition of the standard "JT-T604-2004 Automobile Number Plate Video Automatic Recognition System", the vehicle number plate recognizer is a system for image capture, analysis and recognition of the vehicle number plate, and finally output the vehicle number plate information.
The vehicle license plate recognizer uses a special imaging system that includes intelligent fill light technology. It analyzes the captured license plate image based on computer image processing technology, and automatically recognizes the vehicle license plate through the processes of positioning, rotation, correction, segmentation, and recognition.
Introduction of Automobile License Plate Recognition Technology
Automobile license plate recognition system mainly includes five parts: trigger module, imaging module, recognition module, communication module and application module. Among them, the imaging module and the recognition module are the key to the automobile license plate recognition system.
Trigger module: Automatically detects the vehicle's presence in a specified area. Common trigger methods include coil trigger, video trigger, infrared trigger, radar trigger, and laser trigger. At present, the most commonly used triggering method in charging systems is coil triggering.
Imaging module: Use imaging control and fill light technology to make the camera clear all-weather imaging.
The recognition principle of combining directional reflection and natural light improves the license plate recognition rate and positioning rate. The higher the positioning rate, the higher the recognition rate. The camera imaging control technology and intelligent fill light technology ensure the imaging quality, so that it is not affected by the headlights and the brightness of the light, and the imaging is clear and the recognition rate is high.
Recognition module: It is used to capture vehicle images, and uses image processing and pattern recognition technology to analyze and recognize the captured images.
The application of license plate recognition technology to the urban road congestion charging system does not require the installation of any on-board equipment, which can reduce a large initial investment, but the congestion charging system requires very high accuracy for license plate recognition.
Highway toll management
1. Network charging system
There are some problems in the current toll system: such as changing cards between drivers, etc., causing toll losses; toll collectors cheating and reducing models, causing toll losses; toll collectors lose license plates by hand, the workload is heavy, and it is easy to make mistakes; free There is no information management for cars and blacklist cars. ,
The system installs a car license plate recognizer in the entrance and exit lanes, which can solve the above problems, prevent drivers from changing cards and avoid toll losses; assist in the classification of car models, automatically establish a one-to-one correspondence between car licenses and car models, and prevent downshifting of car models; Automatic identification, check by toll collector to avoid mistakes; establish a free vehicle database, only vehicles in the free vehicle database can be released for free; establish a blacklisted vehicle database, when the blacklisted vehicles pass through the exit, the system will automatically alarm to prompt related deal with.
2. Multi-path identification split account system
In the construction of the networked charging system, all face the problem of multi-path identification and settlement. In a networked toll environment, there is inevitably a highway loop situation, that is, vehicles can start from one point in the network through different lines to reach the destination. In a road network environment with diversified investment entities, path identification not only involves how to calculate the toll for each toll vehicle, but also considers the problem of which toll unit to split the income toll to. Related to the legitimate interests of various highways.
In order to solve the above problems, automobile license plate recognizers are installed in the entrance lanes and exit lanes of all toll stations in the highway network; and the portal frame automobile license plate recognition system is installed at the key points of the ambiguous path. The system maximizes the role of license plate recognition, provides professional and practical management decision-making and service information for path recognition, and greatly improves the efficiency of charging and supervision. Figure 7 shows the network composition structure and various functions of the multi-path recognition split account system .
Highway overrun control
1. Fast detection system of overrun detection station
When a freight vehicle passes a highway control station, it often causes traffic jams due to the complicated detection process. Most of the highway overrun detection stations also use manual input methods. On average, it takes 2-3 minutes to detect a freight vehicle. Some traffic overpass stations often have traffic jams.
After the automatic license plate recognition system is installed, the license plate number, load capacity and other elements of the detected vehicle will be automatically entered into the computer, eliminating the manual input process. It only takes 10 seconds for each truck to be detected, which greatly saves Detection time improves work efficiency and transparency of law enforcement.
2. High-speed pre-check weighing system
On highways with large traffic flow, many lanes and fast speeds, install a high-speed pre-inspection weighing system to carry out pre-inspection of the weight of cargo vehicles traveling normally on the carriageway. If the vehicle exceeds the load limit set by the system, The vehicle ’s license plate number, vehicle image, and detection data are all transmitted to the overrun and overload law enforcement station in front of the vehicle. However, after being pre-detected by the high-speed pre-inspection system, the vehicle that satisfies the regulations is driven normally without entering the law enforcement station.
The combination of high and low speeds and dynamic weighing system is a good solution to deal with overloading and overloading on highways with large traffic flow, many lanes, and fast speeds. It has the characteristics of high detection efficiency and strong detection pertinence, which reduces both The detection pressure of low-speed weighing in law enforcement stations also ensures that road traffic will not be congested due to law enforcement detection.
other
1. Vehicle management of parking lot and unit entrance
How to guarantee the safety of vehicle parking is a problem that has always troubled parking lot managers. The current solution is to issue cards and check out. The verification of the card is carried out in two aspects. The verification of the admission identity relies on the computer, and the verification of the conformity of the passenger and vehicle is carried out by the security guard. Recognize and deal with people's memory and sense of responsibility. The problem is that because people's memory and sense of responsibility vary from person to person, whether or not an error occurs in actual work will vary from person to person, and each new person must be retrained.
The above-mentioned problems can be solved by installing a vehicle license plate recognizer in the entrance and exit lanes. Automatically recognize the license plate information; automatically establish a one-to-one correspondence between the license plate and the identity card. When the vehicle comes out, the system will automatically check it to prevent people without the entrance status from driving and people with the entrance status from driving other people's cars; establishing free Vehicle database, only vehicles in the free vehicle database can be released for free; establish a blacklisted vehicle database, when the blacklisted vehicles pass through the exit, the system will automatically alarm and prompt relevant processing.
2. Vehicle inspection line of vehicle management office
The automatic detection system of the motor vehicle is equipped with a vehicle license plate recognition system, the degree of automation is further improved, the total detection time is shortened, and the queue length of the vehicle to be checked is reduced, and obvious social and economic benefits are obtained.
Development trend of automobile license plate recognition system
The development trend is embodied in the following aspects:
· Video image processing is developed from industrial control computer to DSP and then to smart camera. The machine integrates the development of high-speed DSP processing chip; video image transmission will be transmitted from the image data to the back-end host for image collection, recognition processing, data storage, etc. All are carried out inside the camera, that is, the image collection, processing, storage and communication of the high-definition camera are integrated;
The license plate recognition software is constantly updated, the accuracy rate is increased to 98%, the types of recognized license plates are continuously increased, and special license plates such as agricultural license plates, civil license plates, and overseas license plates can be recognized;
· The monitoring scope extends from the motor vehicle license plate to the characteristics of the car body, the characteristics of the driver and passengers;
· Further application of video detection technology represented by body color recognition;
· The way of supplementary light changes from constant lighting to flash lamp to LED lamp;
· Vehicle detection method developed from ring coil detection to video detection;
· The range and accuracy of vehicle speed measurement have been continuously improved, from coil speed measurement to video-assisted speed measurement;
· License plate recognition has evolved from single capture recognition to multiple recognition of video streams;
· Pay attention to environmental protection and energy saving, reduce the impact on drivers;
· License plate recognition is more professional, equipment maintenance is more convenient, after-sales service is more professional, and network coverage is wider.
New technology application of automobile license plate recognition system
This article will introduce the new technology application in the automobile license plate recognition system in combination with the previous successful cases.
1. High-performance embedded processing system
In a traditional high-definition system, the system sends the pictures taken by the camera to a processing system such as an industrial computer for recognition processing and storage. This requires very high transmission and processing equipment, and it is difficult to meet the design and processing capabilities of the system.
The new intelligent HD camera embedded processing solution can effectively solve the above problems. Each lane is equipped with a 2 million pixel intelligent high-definition camera with a resolution of up to 1600 × 1200 pixels. It is responsible for the facial feature capture of the front and rear passengers of the vehicle, automatic identification of the license plate and automatic recognition of the body color, etc., and the processing results are passed through the Ethernet The network is sent to the intelligent high-definition camera terminal server.
The terminal server adopts an embedded Linux special system, which is responsible for receiving, storing and uploading vehicle traffic information. At the same time, users can view and manage all front-end equipment through the terminal server. Each smart high-definition camera terminal server can simultaneously connect up to 20 smart high-definition cameras. Greatly improve system processing performance.
2. Integrated design of image acquisition and processing
The intelligent high-definition camera integrates an industrial-grade progressive scan CCD and high-speed DSP chip to independently complete the entire image capture, license plate recognition, body color recognition, speed acquisition and other functions. After the vehicle information is obtained, the result assembly and communication module are packaged and uploaded through Ethernet The terminal server enhances the processing capacity of the system, making the system structure clear and concise, and easy to expand.
3. All-weather high-definition imaging with feedback control
The entire imaging system is a precision system composed of intelligent high-definition cameras, intelligent fill lights and imaging control software. The orderly coordination and feedback control between them make the vehicle images captured during the day and night have high definition, ensuring the body, license plate and The facial features of the driver and passengers in the front row of the vehicle are clearly identifiable.
The system integrates the light reflection characteristics of the front windshield of the vehicle, the filming situation, and the ambient light exposure situation. It uses a special lens, a special imaging control strategy and a supplementary light method. At the same time, a reasonable equipment layout method is arranged to make the system all-weather It can effectively solve the problems such as the reflection of the front windshield and the direct light of various types of vehicles, and ensure that the facial features of the body, license plate and front passengers of the vehicle are clearly distinguishable.
4. Body color recognition
It can automatically recognize the shades of body colors and 10 common body colors, providing a new scientific and technological means for public security inspections and criminal investigation cases.
The system can automatically distinguish whether the vehicle is a dark vehicle or a light vehicle; and recognizes 10 common body colors, including white, silver, gray (including gray and silver gray), black, red (including red and dark red), dark blue , Blue (including blue and cyan), yellow (including golden and yellow), green (including green and dark green), brown (including light brown and brown), colors other than 10 colors (including color vehicles) are other colors .
The accuracy rate of the depth classification is not less than 80%; the accuracy rate of the 10 common body color recognition is not less than 60%.
5. Video auxiliary trigger, auxiliary speed measurement
Using video trigger as an auxiliary trigger, when the coil trigger fails, it can alarm in a shorter time and replace the coil for triggering work. In this way, the user can get the fault information in the first time, and can still effectively monitor the road operation status before the problem is solved, and can achieve uninterrupted monitoring and timely response.
6. Independent front-end and back-end proprietary network structure
Two independent network structures are adopted, that is, the network between the terminal server and the intelligent high-definition camera and the network between the terminal server and the center are independent of each other. This can reduce the occupation of the IP address of the public security network. It is more convenient to add equipment or change the IP in the monitoring point, and the network security is also greatly improved.
Conclusion
The new generation of integrated car license plate recognition system based on high-definition intelligent industrial cameras will play a greater role in the field of intelligent transportation and urban security, and will show the advantages of its advanced technology in various applications.
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