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

• height of the symbols is not less than 15 px, stroke width is not less than 2px;
• 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%.

Procedure of video cameras setup and mounting for the VIT software module is presented in the vendor documentation.

Basic characteristics of used video cameras are presented in the General requirements for mounting and configuring of cameras section.