Are there any requirements for number plate recognition cameras?

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 streamsSupport for dual stream with independent configuration.
Stream resolutionAt least 1920×1080px.
Frame rateAt least 25 f/s.
Focal length of the lensWith a recognition distance of 3.4m – from 3.8mm;
With a recognition distance of 9.8m – from 8mm.
Lens typeMotorized zoom lens.
Matrix1/1.8’’ Progressive Scan CMOS.
ApertureManual ( optional – Auto).
S/N ratio> 50 dB.
Photosensitivity0.002lc (F1.2) – 0.00027lc (F1.4).
Image enhancementHardware WDR, 140dB (with the implementation of the transmission system).
IR illumination in the area of the plate numberat least 100 lc (at speeds up to 30 km/h);at least 200 lc (at speeds from 30 km/h and above);
Electronic shutter lagfrom 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 bitrateConstant bitrate – 4 Mb/s.
Working conditions
Environmental conditions-40 °C…+60 °C, humidity not more than 95% (without condensation).
ProtectionIP67, Thermal housing with heating is mandatory.
Built-in heatermandatory.

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