License Plate Recognition (LPR/ANPR)

LPR uses dedicated cameras with fast shutters and IR so the plate is sharp even on a moving vehicle or at night. AI then reads the characters and checks them against allow and block lists.

Lao and foreign plates

Lao plates carry Lao script and the province name, and trucks from Thailand, Vietnam and China cross every day. Accuracy on Lao plates varies a lot between brands and models, and brochure figures are usually measured on other countries' plates. So we pilot with real vehicles at your site first, and design for an operator to confirm when the system isn't confident.

Mines have another problem: a truck plate caked in mud or dust can't be read by any camera. A wheel-wash before the gate often helps more than a better camera.

Installed properly

• Camera angle within roughly 30° horizontally and vertically
• Plate at least about 130–150 pixels wide in the image (check each vendor's spec)
• Vehicles in a defined lane, plate visible before the barrier
• A loop detector or sensor so the barrier never comes down on a vehicle. Never skip this.

Integration

LPR connects to barriers, parking systems, weighbridges (plate, weight and photo in one record) and the VMS for searching vehicles after the fact.