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2026-08-29
A complete ANPR workflow includes four core stages: image capture, plate detection, character OCR recognition, and data output.
When a vehicle approaches the barrier gate, the ANPR camera triggers image capture. Triggers can be radar sensors, ground‑loop detectors or infrared sensors. The built‑in IR infrared fill light compensates for low‑light, night and backlight conditions to get clear plate pictures.
The algorithm locates the license plate area from the full‑frame image. It filters out irrelevant background such as trees, buildings and pedestrians, and locks only the plate region.
Optical Character Recognition (OCR) converts plate images into editable text numbers and letters. High‑performance on‑board chips process this calculation locally inside the camera, no cloud server required for basic access control.
The recognized plate number is sent to parking software. If the plate is on the whitelist, the parking barrier gate opens automatically. For visitor vehicles, the system records entry time for billing. Data can be transmitted via TCP/IP, 485 or 4G to local servers or cloud platforms.
Robot‑Series LPR camera
Accuracy is not only decided by camera hardware. Many field issues reduce real‑world performance:
Light condition: strong backlight, direct sunlight, heavy night glare
Vehicle speed: too fast passing will cause motion blur
Plate condition: dirty, faded, bent or covered license plates
Installation height & angle: wrong mounting position leads to distorted plate perspective
Working temperature: overheating inside outdoor camera housing causes performance drop
This is why our patented dust‑proof heat‑dissipation structure helps outdoor ANPR units maintain stable recognition performance in high‑temperature dusty environments.
dust‑proof filter patent
Most common for standard parking access. Camera, fill‑light, computing unit are built into one housing. Easy installation, good for commercial parking, residential compounds and business parks. Jieweishi Robot‑Series belongs to this category.
Image sensor and recognition box are separated. Used for multi‑lane, high‑flow large parking lots. Higher cost, for large‑scale commercial projects.
Even high‑quality ANPR hardware will under‑perform with poor installation. Follow these practical rules:
Mount height: 1.2‑1.6 meters above ground
Horizontal offset: keep 1‑3 meters distance from vehicle driving lane
Avoid direct facing sunrise or sunset to prevent backlight overload
Use radar or ground‑loop trigger instead of video motion detection for fewer false triggers
Ensure good ventilation for outdoor cameras; avoid sealed installation that causes overheating
Residential gated communities
Commercial shopping‑mall parking
Office business parks
Hotel parking lots
Industrial‑plant vehicle access control
Modern ANPR parking removes physical tickets and cards, cuts manpower cost and improves vehicle passing efficiency.
Recognition accuracy depends on hardware algorithms, thermal management and correct field installation. Choosing robust outdoor‑grade LPR hardware can greatly lower long‑term maintenance trouble.
Need reliable all‑in‑one ANPR camera for your parking project? 👉Contact Us
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