The license plate automatic identification system is a brand-new product introduced by C&T Technologies. As the subsystem of the intelligent parking system, it automatically recognizes and records the license plate through the computer's image processing, and it is the current recognition speed that distinguishes whether the same license plate is the same when entering or exiting the vehicle. Fast license plate recognition system. Its software module can be embedded in the intelligent parking lot system software, with the hardware to achieve the automatic license plate recognition function, making the parking lot system more complete and accurate.
The automatic identification core of XANTAC Technology license plate has absorbed the essence of the domestic and international license plate recognition algorithms, and has made optimization and improvement on the basis of this, which has greatly improved the speed and accuracy of positioning and recognition, especially for lighting. The demand, because too much reliance on the environment will undoubtedly create obstacles for installation and promotion. Due to the unfixed installation position, the license plate's reflection, backlight, backlight and other factors will directly affect the license plate recognition. The improved algorithm has greatly improved the recognition of the above license plate.
Product Introduction Automatic license plate recognition system, which is a special computer vision system targeting a specific target, can automatically extract the license plate image from an image, automatically divide the characters, and then identify characters, it uses advanced image processing, mode Recognition and artificial intelligence technology, to process the collected image information, can automatically and accurately identify the digital, letter and Chinese characters of the license plate in real time, and give the identification result directly, making the computerized monitoring and management of the vehicle a reality.
Detailed description The traditional parking lot mostly adopts a card reading method, and the IC card is distributed to the vehicles entering the parking lot to record the time of entry and exit of the vehicle as the main basis for billing. Whether it is a fixed vehicle or a temporary vehicle, access to the parking lot must be done at the entrance and exit card to enter and leave the parking lot. In the busy period of vehicles, this method often causes traffic jams, such as large-scale parking lots, large daily traffic, and the use of traditional parking management systems can not meet the needs of the rapid entry and exit of vehicles. In order to solve the problem that vehicles cannot enter and exit quickly, a set of license plate recognition system solutions based on license plate recognition technology is developed, which can realize the management of vehicles without parking and solve the problem of congestion due to excessive traffic volume.
Features 1. Strong lighting adaptability Due to the great difference in daylight and night lighting environments, different application areas also have different lighting environments. Therefore, a light control module that automatically adjusts the electronic shutter and exposure intensity is developed to adapt to different lighting conditions. surroundings.
2. High-speed algorithm and high-speed hardware platform are adopted for the adaptability of vehicles with ultra-high speed and ultra-low speed. The vehicle number can accurately identify the license plate number when it is running at high speed or at low speed, avoiding the low speed error and speed measurement of the coil during radar speed measurement. The problem of system instability.
3. Compared with the independence of the application system, the embedded structure is used to integrate the lighting, shooting, image acquisition, and license plate recognition algorithms. This structure makes the communication between the same application system only through the communication interface and communication protocol. Relationships occur.
Function 1, vehicle automatic monitoring: through the front-end camera.
2. Vehicle photo records: Using license plate recognition modules and cameras for each vehicle, and using license plate recognition and video speed measurement equipment to obtain a clear license plate image.
3, automatic lighting function: (1) The device itself has a lighting tool that can meet the needs of shooting license plates and recognition and speed measurement. (2) In order to get a clear picture of the vehicle at night, the device's built-in color camera is set to automatic gain control mode to get a good shooting effect.
4, with the basic model analysis function: use the license plate color information given after the identification (blue white, black yellow, black and white) to determine the initial model, and can set a different speed limit to make a difference Speeding alarm.
5. Database management related functions: After storing the basic data of the traffic vehicle (car direction, speed, traffic time, license plate number, vehicle type, and whether it is illegal) in the database, you can perform various comprehensive queries and management on the data:
(1) It has a traffic statistics function, which can collect daily, weekly, monthly, and yearly traffic data, traffic distribution, and other data, and can display, generate reports, print reports, etc. with charts.
(2) It can search for historical records according to time, speed, model, direction of travel, license plate number, etc., display related data of relevant vehicles, and generate reports, print, etc.
(3) The database has an automatic maintenance function, which can ensure long-time, large-capacity storage, can automatically refresh, without manual management.
6. Other functions of the system software:
(1) It has a user operating authority management mechanism to prevent unrelated personnel from operating.
(2) System management and query software can be run remotely, and remote query, statistics and system maintenance functions can be realized through remote media such as the Internet and Modem.
(3) System management and query software can perform multi-task scheduling, monitoring, querying and printing will not affect each other.
(4) Various parameters can be set to facilitate the installation and use of the system.
In the process, the license plate recognition camera and the sense coil are installed at the entrance and the exit respectively. When the vehicle arrives at the entrance, the sense coil is triggered. The license plate recognition camera is used to capture and process, and then the license plate number, license plate picture, etc. License plate recognition software is sent to the data server. When the vehicle arrives at the exit, it triggers the sense coil, the license plate recognition camera takes snapshots and handles it, and then transmits the license plate number, license plate image and other information to the software. The software will retrieve the entrance information of the vehicle in the data server and analyze the vehicle automatically. Nature, and automatically calculate the charge amount according to the set rate, send the charge information to the data server and the fee display screen, and the chargeer will charge according to the system prompt and raise the barrier release.
Details of the SZJA license plate automatic identification system:
First, the system description:
1) Vehicle access:
1, the vehicle enters the license plate camera capture area, triggering the sense coil.
2. The license plate recognition system automatically captures the image of the vehicle and recognizes the license plate identification number, and then obtains the vehicle category by searching the database.
3, through the license plate number data to determine whether the internal vehicle, so that the barrier automatically open. Outside vehicles need to be confirmed manually. Blacklist comparisons.
4. Open the gates and note the time of vehicle entry. The entire process is automated and no staff intervention is required. The vehicle is always in driving condition and there is no pause.
2) The vehicle leaves:
1, the vehicle enters the license plate camera capture area, triggering the sense coil.
2. The license plate recognition system automatically captures the image of the vehicle and recognizes the license plate identification number, and then obtains the vehicle category by searching the database.
3. If the vehicle belongs to an internal vehicle, the gate will be automatically opened and released. The computer retrieves the captured image of the car when entering the stadium, the time of entry, etc. 4. If the vehicle is blacklisted, regardless of whether it is a temporary or fixed vehicle, the gate will not be opened and the system will send an alarm signal to inform the staff .
5. The vehicle passes over the entrance and exit, enters and leaves the parking lot, and the system notes the departure time of the vehicle.
Second, technical parameters:
Number plate recognition rate: ≥ 97.8% during the day and ≥ 96% at night
Number plate detection rate: ≥ 99.9% during the day; ≥ 99.7% at night
Accommodate speed: 0-150 km/h Output information Vehicle characteristic image, license plate image, license plate number, color, type, passing time data Interface method: 10/100M Ethernet TCP/IP
Image Sensor: 1/3" CMOS
Effective pixels: 720P
Minimum illumination: 0.1 Lux (standard)
Signal to noise ratio: >50db
Electronic shutter: 1/1 to 1/10000 second, 22-speed shooting range: 3-10 meters Light source lighting frequency: 50Hz
Protection class: IP66
Working temperature: -25°C~70°C
Working humidity: ≤ 90%
Power supply voltage: DC 7-24V, ripple <200mV
Dimensions: 452×145×133mm
Weight: 2Kg
Total power consumption: 7W
Storage temperature: -50°C~120°C
Snapshot picture resolution: 1920*1080768*576, 720*576, 704*576;
Image gray scale: 256 levels;
Image color level: 24 bit true color;
Recognition time is less than 0.3 seconds / vehicle times;
Average failure free running time MTBF ≥ 30000 hours;
Third, the scope of application: port, community, toll stations, enterprises and institutions, such as the entrance
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