A certain camera position and view angle are required for high-quality number plate recognition.
Minimum requirements for parameters for number plate recognition cameras:
|Number of streams||Support for dual stream with independent configuration.|
|Stream resolution||At least 1920×1080px.|
|Frame rate||At least 25 f/s.|
|Focal length of the lens||With a recognition distance of 3.4m – from 3.8mm;|
With a recognition distance of 9.8m – from 8mm.
|Lens type||Motorized zoom lens.|
|Matrix||1/1.8’’ Progressive Scan CMOS.|
|Aperture||Manual ( optional – Auto).|
|S/N ratio||> 50 dB.|
|Photosensitivity||0.002lc (F1.2) – 0.00027lc (F1.4).|
|Image enhancement||Hardware WDR, 140dB (with the implementation of the transmission system).|
|IR illumination in the area of the plate number||at least 100 lc (at speeds up to 30 km/h);at least 200 lc (at speeds from 30 km/h and above);|
|Electronic shutter lag||from 1/250s – at car speeds up to 30 km/h;|
from 1/500s – at speeds up to 60 km/h;
from 1/1000c – at speeds up to 90 km/h;
from 1/5000s – at speeds up to 200 km/h;
support of slow shutter.
|Video bitrate||Constant bitrate – 4 Mb/s.|
|Environmental conditions||-40 °C…+60 °C, humidity not more than 95% (without condensation).|
|Protection||IP67, Thermal housing with heating is mandatory.|