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- Size of each image in sequence is not less than 320 dpi in width and not less than 240 dpi in height.
- Height of LP symbols on the image is not less than 16px (noninterlaced scan) or 32px (interlaced scan).
- License plate consists of latin symbols and digits.
- Brightness of field of LP symbols is changed not more than on 15 units (from 255 gradations);
- Brightless of field of license plate is chsnged not more than on 30 units (from 255 gradations);
- Only single-line plates can be recognized;
- Difference of symbol sizes on the vehicle direction in the frame is not more than 3 units.
- Each license plate is to be presented in the input data not less than in 3 frames.
Basic characteristics of used video cameras are presented in the General requirements for mounting and configuring of cameras section.
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Recommended video stream speed for the AxxonSoft software module is 3 fps, i.e. the license plate should be entirely displayed and read at least in three frames for the correct LP recognition and determining the directions of vehicle moving. |
Main parameters required for mounting video camera for working with the Axxonsoft software module are presented in the following table.
Parameter | Maximally allowed value |
Vertical angle of video camera excursion to plate of road | 30° |
Angle of horizontal video camera excursion from direction of vehicle moving | 20° |
Angle of license plate heel to the bottom border of frame | 5° |
The closer specified parameters to null, the higher probability of recognition.
Maximal values of excursion are presented in the following figure.
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