The ANPR panel turns on number plate recognition with the handset’s camera, so the officer points the camera at a plate instead of typing it.
Automatic number plate recognition lets the handset camera read a plate instead of the officer typing it.
Enabled ANPR turns the reader on in the app. The officer then points the camera at the plate and the field fills itself, which is both faster and free of typing mistakes that break a later search.
ANPR Territories tells the reader which plate formats to expect. Getting this wrong is the usual cause of plates being misread or not recognised at all, so select the territories your traffic actually comes from.
LPR Last Read Cool Down Period is how long a plate that a camera has just read remains usable, entered as hours and minutes. The supplied value is five minutes.
It matters in two places, and neither of them is on this panel:
- Multi-factor checks at the checkpoint. Where a pass requires a plate and something the visitor holds, the officer only captures the second factor: the plate comes from the last read on the same access control point in the same direction. If the camera read the plate longer ago than this period, the product treats it as if nothing had been read, and the check is refused as no plate match while the handset is online. Too short a period and a driver who queued behind three other cars is refused for no visible reason; too long and a plate read from a vehicle that has since driven away can be paired with whoever presents a code next.
- ANPR auto-enrolment. The same window decides which plate is picked up by Add ANPR Credential to Visitor Registration on an access control point, which turns the last plate read into a credential for the visitor who has just checked in.
Set it to the realistic time between a vehicle passing the camera and the driver finishing at the checkpoint, then leave it alone. If it is set very high, a plate read is still considered current long after the vehicle has gone, and that is what lets a plate be paired with the wrong person.
