ANPR works properly if the following camera specs, installation, and configuration requirements are met:

• character height at least 10p, preferably 20p or more;
• minimum resolution 1280*720, recommended 1920*1080;
• minimum frame rate for Slow mode 5 fps mode, for Fast mode 20 fps;
• maximum horizontal angle: 30°;
• maximum vertical angle: 45°;
• expected image contrast: the contrast difference between characters of the number plate and the background should be at least 20 units with an image brightness scale of 0 to 255.       

 If it is necessary to determine the direction of movement of the vehicle, the following additional requirements should be met:

• installation height of the camera is not less than 3 meters;
• the angle between the camera and the direction of the road is not more than 30°;
• minimum tilt of the camera.