X-Core Technology XCH17WM Service Manual page 8

Appendix
Installation Manual for Special Application: License Plate Recognition
1. A 5-55mm or other more than 10X suitable vari-focal auto iris lens is
recommended. Connect regulated DC12V power supply to the power input at the
rear panel of camera. Connect HD-SDI output to the HD monitor.
2. Fix the camera on the bracket. Adjust the viewing angle of camera according to
the below recommendations:
For capturing the front plate no.: Setting the camera at a 15° or less vertical
angle will achieve the best performance. Do not let the vertical angle exceed
20° (Figure 1).
For capturing the back plate no.: The vertical angle must not exceed 30°
(Figure 2).
Capture zone distance: Between 15~20 meters from the camera.
0°
<20°
15~20M
[Figure 2]
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[Figure 1]
0°
<30°
15~20M
3. Adjust the zoom of the vari-focal lens. The picture width should not exceed 1.5
traffic lanes at the capture zone.
Enter SETUP menu and select "DC" under LENS options.
4. In order to ensure a clear image under different light conditions, adjust the
settings once during the daytime and once during the nighttime is recommended
to achieve optimal results.
Daytime setting:
Adjust the lens focus to see a clear image both at the center and the upper /
down edges of the monitor. If the image on the monitor is too bright, adjust
the shutter speed accordingly.
Enter EXPOSURE sub-menu under SETUP menu and select "SHUTTER".
Select shutter speed according to the speed of vehicle.
Suggested Shutter Speed:
When speed of vehicle is less than 50km: 1/250 sec.
When speed of vehicle is less than 100km: 1/500 sec.
When speed of vehicle is more than 100km: 1/2000 sec.
Nighttime setting:
Adjust the lens focus to see a clear image at the upper / down edges of the
monitor (means focus at the center). According to the environment, adjust
AGC value to heighten the brightness signal when necessary.
Enter EXPOSURE sub-menu under SETUP menu and select "AGC".
AGC: LOW – MIDDLE – HIGH adjustable.
5. If the image is smeared and the license plate number is not captured clearly, adjust
the shutter speed until the image is clear.
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