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changes.mady.by.user Mariya Nekryata

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changes.mady.by.user Yulia Morozova

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Rus

For recognition it is necessary to make sure that frames with number plates fulfill the following characteristics:

  • for analog cameras the height of the symbols in the frame is to be not less than 14-20 px; 
  • for IP cameras the height of the symbols in the frame is to be not less than 20-30 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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