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changes.mady.by.user Alina Luchkina

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ANPR works properly if the following camera installation requirements are met (for a list of supported countries, visit the web-site of the recognition module's manufacturersee License plate recognition (VT) features and specifications):

  • a camera should be installed in a horizontal position (refer to manufacturer's documentation);

  • character height is at least 15px, stroke width is at least 2px;
  • minimum allowable contrast for uniformly contaminated license plates should be at least 10% (contrasting visibility of characters relative to the background is 25 on a 256-point scale);
  • maximum allowable non-uniform contamination is no more than 12% (the ratio of the contaminated area to the total area of the license plate);
  • the geometric proportions of the image shall not deviate by more than 10% from the real geometric proportions of the license plate.

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Some example number plate images that should be recognized fully and properly:

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