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Requirements for video camera installation:
| - | Passenger railway carriages | Cargo railway carriages | UIC railway carriages | Railway containers |
|---|
Character height in the frame | At least 10 pixels; >= 16 pixels are recommended | |||
Possible places for reading numbers | ||||
| Carriage number |
Carriage number, number on the chassis |
| Carriage number, number on the chassis |
крыша и стороны контейнера
Roof and sides of container | ||||
| Number of control cameras | 1–2; 2 are recommended | 1–4; at least 2 are recommended; 4 – if there are platforms | 1–4; at least 2 are recommended; 4 – if there are platforms | 1–6; at least 2 are recommended |
Width of camera control zone | 5–10 meters | 5–10 meters | 5–10 meters | 4–8 meters |
Camera horizontal angle | <= 20° | |||
| Camera vertical angle | <= 30° | |||
| Camera angle of view | <= 5° | |||
The camera height relative to the top of the railroad tracks | 3–3.5 meters | 3–3.5 meters for reading the side numbers, 1.5 meters for reading the chassis number | 1.7–2.3 meters | 2.5–3.4 meters |
| Distance between the camera and the carriage | 1,5–10 meters (depends on the focal length of the camera lens), the optimal distance is 4-6 meters | 1,5–10 meters (depends on the focal length of the camera lens), the optimal distance is 5-7 meters | 1,5–10 meters (depends on the focal length of the camera lens) | 1,5–10 meters (depends on the focal length of the camera lens) |
To simplify the setting, it is recommended to use the varifocal lenses. The focal length variation range should be selected in each case of the system installation. | ||||
If you use the camera with an integrated lens with a focal length of 2.8 mm or less, then there may be strong geometric distortions on the image. As a result, the recognition quality may go down. To avoid this, it is necessary to use special removable lenses with an aspherical lens, which eliminate these distortions. | ||||
Minimum required lighting of a number | Depends on the camcorder used | |||
. Typical value is 50 lux. To illuminate the control zone at night, it is recommended to use LED lamps with a direction zone of maximum light intensity of about 90 degrees. You can use a typical halogen spotlight with a capacity of 1–1,5 kW if the spotlight is mounted in distance 5-7 meters from the railway. Locate the spotlight as shown in the figure below. Such location allows to avoid the following:
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| Schematic representation of the spotlights and video cameras location for the correct license plate recognition |
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Example of successfully recognized numbers |
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