For recognition o ensure the recognition of the state license plates using the VIT software module, it is necessary to make sure that frames with number plates fulfill the following characteristicsinstall 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:
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