ALPR

ALPR — Automatic License Plate Recognition — is the computer vision technology that reads vehicle license plates from camera video in real time and converts them into searchable text. It is also commonly called LPR (license plate recognition) or ANPR (automatic number plate recognition) depending on the region.

How It Works

An ALPR pipeline combines detection and text recognition:

1. Plate detection — a neural network finds the plate region in each frame.
2. Orientation correction — the plate image is rotated and straightened.
3. Character recognition — a second model reads the alphanumeric string, tuned for local plate formats.
4. Verification — multi-frame voting and checksum rules reject low-confidence reads.
5. Action — the plate is matched against watchlists, barrier rules, or analytics dashboards.

Production ALPR systems read plates on vehicles moving up to 200 km/h with 95–99%+ accuracy in controlled conditions.

Why It Matters

ALPR turns any camera on a road or gate into a structured data source for:

• Security — stolen or wanted vehicle alerts
• Access control — automatic barrier opening for registered vehicles
• Revenue — parking, tolling, and congestion charging without manual enforcement
• Operations — truck dwell time, delivery verification, logistics flow

IncoreSoft's ALPR module supports plate formats from 100+ countries and is widely deployed in Safe City programs and private corporate campuses alike.

Use Cases

• City traffic — red-light cameras, bus-lane enforcement, toll roads
• Law enforcement — BOLO alerts, forensic vehicle search
• Parking systems — ticketless entry and occupancy analytics
• Logistics yards — truck identification and dwell tracking
• Corporate security — automated vehicle access control

Frequently Asked Questions

Is ALPR the same as LPR or ANPR?

Yes, they refer to the same technology. ALPR is common in North America, ANPR in the UK and EU, and LPR is used globally. Functionality is identical.

How accurate is ALPR at night?

With infrared-capable cameras or dedicated ALPR cameras with IR illumination, nighttime accuracy is close to daytime. Standard daytime-only cameras drop significantly after dark.

Does ALPR need dedicated hardware?

Not necessarily. IncoreSoft's ALPR works with most IP cameras via RTSP. Dedicated ALPR cameras (with optimized shutter, lens, and IR) are recommended for high-speed or high-volume scenarios.