ANPR questions & answers
Answers for the systems around number-plate recognition.
Practical, vendor-neutral guidance for cameras, NVRs, VMS platforms, access control and metadata integrations.
These are general industry answers, not product support. Setting up ANPR Edge? Read the camera connection guide.
3 answerin API
How do I get Hikvision ANPR plate data via the HTTP API?
Many integrators discover that recent Hikvision firmware has deprecated traditional GET polling endpoints for plate data. Instead of polling the camera, you must configure the camera's HTTP Listening Server to actively push multipart XML payloads to a designated TCP server whenever a plate is detected.
Hikvision ISAPI Event Notification Integration
Why did my Dahua ANPR HTTP API stop working after a firmware update?
In recent firmware updates (late 2023 onward), Dahua intentionally deprecated and removed the local unencrypted HTTP/CGI endpoints that developers traditionally used to extract license plate events. This breaks custom third-party integrations that rely on these legacy scripts.
IP Cam Talk: Dahua Firmware Warning
Can ONVIF Profile S send ANPR metadata?
No. There is a universal misunderstanding across the industry that ONVIF Profile S supports metadata. Profile S only standardizes the transmission of RTSP video pixels and simple binary motion alarms. It cannot transmit license plate text or structured XML metadata.
ONVIF Profile M Overview and Specifications
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