Package Description for License Plate Recognition (LPR)

Real-time recognition events are received from a camera using either the VAPIX or ONVIF protocol. These events provide relevant information related to license plate recognition, without including the actual image data. To learn more about the usage and implementation of these protocols, you can refer to the Axis VAPIX Library at https://www.axis.com/vapix-library/#/ and explore the "Event Data Streaming" section.

When subscribing to the LPR events, the following data is sent to the subscriber:

Field name	Description
text	License plate text
country	3 letter country names, according to the Alpha-3 ISO-3166    (https://en.wikipedia.org/wiki/ISO_3166-1_alpha-3)
height	The height of the license plate measured in pixels
width	The width of the license plate measured in pixels
left	Left coordinate of the license plate measured in pixels
top	Top coordinate of the license plate measured in pixels
listName	The name of the list. It is empty if the plate text cannot be found in the list and labelled as either a “Block list” or “Allow list” if it exists.
Action	Set to either “Opened” or “No action” depending on whether an application configuration has occurred or not.
consumedTime	License plate recognition time measured in milliseconds (ms).

                                                                                                                                                                                                       

• Related Articles

• Managing License Plate Blacklist and Whitelist

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• Confidence level (recognition issue)

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• Application Installation and OFFLINE License Activation (*upd.24.10.23)

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• Package sample

  <tt:MetadataStream xmlns:tt="http://www.onvif.org/ver10/schema"> <tt:Event xmlns:tt="http://www.onvif.org/ver10/schema"> <wsnt:NotificationMessage xmlns:tns1="http://www.onvif.org/ver10/topics" xmlns:tnsaxis="http://www.axis.com/2009/event/topics" ...

• License key deactivation

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