NUMBER-PLATE RECOGNITION SYSTEM
The number-plate recognition system is designed to control the entry and exit of vehicles through the parking area. Also, it helps to distribute the parking lots. The system controls the parking of cars at fixed places in the business center using the Merusoft Smart Office application. This system receives a video stream from each security camera that is installed at the entrance, exit, and the whole territory of the parking area. The number-plate recognition server processes the video stream. It determines the car in the captured image, the number-plate area, and the vehicle registration number. The number-plate in a digitized symbolic form is transmitted to the diagnostics monitoring and control system, and Smart office. This data is required to access business processes, control the time of entry and exit, calculate the cost of the parking, and others.
Technical specifications:
| Probability of number-plate recognition in real traffic: | |
| For automated accounting with an error probability of no more than 0.5%
(for the automatic compilation of notifications of offenses for real traffic flow and photographic materials from other systems) |
Not less than 75% |
| For visually distinguishable objects from a distance of 40 m (i.e. for clear numbers-plates that meet the requirements of the Vienna Convention of road traffic dated November 8, 1968) | Not less than 99% at the daytime
Not less than 99% at night (in the dark) |
| A possibility of recognition of dirty car number-plates | |
| With uniform impurities |
The minimum allowable contrast of the number-plate image is 10% (contrast distinguishability of symbols due to the background is 25 units with a 256-point scale)
|
| With non-uniform impurities |
The maximum allowable impurity is 12% (the correlation of the area of the dirty area to the whole plate area)
|
| Number of recognized types of number-plates |
More than 300 types, including:
|
| Supported input methods of images for recognition |
Standard analog CCTV Cameras
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| Characteristics of standard-issue used TV sensors | |
| Control zone width of one CCTV video camera |
3 m with a frontal camera |
| Control zone width of one digital camera with 1 MP definition |
6.5 m with a frontal camera
|
| Control zone width of one digital camera with 3 MP definition |
11 m with a frontal camera
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| The maximum possible slope of the camera without loss of recognition quality |
Vertical – no more than 30º |
| The maximum possible slope of the number-plate in correlation to the roadbed |
No more than 10º in any direction
|
| Illumination in the control area |
At least 50 lux for camcorders with 0.05 lux CCD matrix sensibility At least 20 lux for camcorders with 0.0002 lux CCD matrix sensibility 0 lux for camcorders with IR tap lights |
