Documentation for Auto PSIM 1.0.1.

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To ensure the correct recognition of the railway container license plates, follow the requirements listed below.

Requirements for video camera characteristics:

  1. High definition cameras (720p recommended);
  2. Recommended frame rate per second is 24;
  3. The container motion speed must meet the camera operation speed. For a better recognition, it is necessary and it is enough to have 1-2 frames of a container number.
  4. it should be possible to set a fixed exposure value (shutter) on video camera of 1/2000 s or less;
  5. the video cameras should have high sensitivity (0,01 lx or more).

Requirements for video camera position:

  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;

    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.

    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 position of the container or wagon in the frame should be strictly horizontal;
  2. the size of the number symbols on the image should be between 20 and 40 pixels, i.e. not less than 4% of the image height;
  3. geometric distortions ("barrels", "pillows") introduced by the optics should be moderate.

Also it's required while video camera setup:

  1. Focus camera exactly to the container or wagon plate;
  2. It is recommended to turn off all the camera's smart features. For example, contrast adding mode.

Below is a diagram of the camera installation to ensure the most accurate recognition of license plates of freight containers.

Reference image received from correctly mounted and setup video camera is shown in the following figure.

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