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
Real-time Events API (VAPIX or ONVIF)
To receive real-time recognition events from the camera, you can utilize either the VAPIX or ONVIF protocol. These protocols allow you to access event data packets containing relevant information without the actual image. The packet structure for ...
Managing License Plate Blacklist and Whitelist
CAMMRA offers the functionality to add license plates to both the blacklist and whitelist. You can conveniently add license plates directly through the web interface or import them from a CSV file. Here's how to manage the lists: Web Interface ...
Confidence level (recognition issue)
If you are experiencing frequent missed license plates, consider lowering the recognition confidence setting by 0.1 or 0.05. After adjusting the confidence level, monitor the system and review the results after 100-150 license plate events to gather ...
API FF Integration Events \ HTTP Multipart POST
New Event: This event occurs when a vehicle is detected for the first time. The direction of the vehicle is undefined. Update Event: This event occurs when there is a change in the data package. It can include updates to the recognized license plate, ...
Advanced Settings
To access the advanced settings in CAMMRA and customize the application according to your needs, follow these instructions: Plate Size Min. and Max. (Default): The plate size settings determine the minimum and maximum size of license plates that ...