Page History

...

1. The distance between the video camera and the carriage should be at least 1,5 meters (depends on the focal length of the camera lens), the optimal distance is 5-7 meters;

   Info
   title Note
   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.

   
   

2. the cameras height for reading the side number is 3–3,5 meters, the cameras height for reading the chassis number is 1,5 meters;
3. the width of the carriage plate number in the image should be about 30-35% of the total image width, in most cases this means the width of the camera control zone is 3-5 meters;
4. the optical axis of video camera should be perpendicularly to plane of carriage plate;
5. the position of the carriage in the frame should be strictly horizontal;

6. the infrared sensor and the video camera should be located in the same vertical plane.

   Info
   title Note
   If the analog video camera is used, then to prevent the video signal fading on the transmission line, it is necessary that the distance from the video camera to the digitizing device does not exceed 30 meters.

   
   

Image requirements:

1. The minimum character height in the frame should be at least 16 pixels, 30–50 20–50 pixels are recommended; the character line width should be at least 2-3 pixels;
   Image Added
2. the geometric distortion by optics ("barrels" and "pillows") should be reduced;
3. the image of the carriage plate numbers should be clear, contrast and readable.

...