To ensure the recognition of the state license plates using the VIT software module, it is necessary to install and configure the video cameras in such a way that the following requirements are met:
| Camera specifications | |
| Video image | - The symbols height for IP cameras should be not less than 20-30 px, for analog cameras - not less than 14-20 px, the stroke width should be not less than 2 px;
- Minimum allowed contrast with evenly dirty number plate should not be less than 10% ) contrast differentiation of symbols to the background is 25 on 256 point scale);
- Maximum allowed uneven dirtiness is not more than 12% (ratio of the dirty area of the number plate to its whole area);
- Geometrical proportions of the number plate picture should not differ from such proportions of the number plate itself with more than 10%.
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| Camera positioning | - The camera should be installed permanently (for detailed installation information, see the vendor documentation);
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| Vehicle speed | |
Examples of LP images that will be recognized correctly and completely:
To ensure the correct recognition of the LP number, its image should not be:
- unequally lit;
- overexposed;
- blurred (due to incorrect shutter speed settings for the speed of the vehicle);
- distorted (due to incorrect placement of the camera);
- interlaced;
- dirty.
Any deviation from the above requirements reduces the likelihood of correct number recognition. |