Adaptive Recognition Einar, Руководство пользователя

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EINAR USER MANUAL
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ANPR detector and ANPR engine
The ANPR detector and the ANPR engine jointly perform the reading of license plates.
7.12.3. ANPR engine
You can choose between the Onboard ANPR Engine running on the camera or the Carmen Cloud ser-
vice for license plate recognition.
You can create a mask on the image, after which license plates will be detected only in the selected
area. It is recommended to select the area where license plates are expected to appear on the image.
The expected area of license plates can be plotted on the image with a polygon that contains a given
number of vertices.
In the case of Onboard ANPR, you can adjust the primary functions of the ANPR engine:
•
Engine: It shows the current ANPR version and region.
•
Minimum confidence: Use the slider to define what reading confidence percentage should trig-
ger an event. A low value potentially results in more reading errors. A high value potentially
leads to missed reading cases. Therefore, values between 50-70% are recommended. Check
the "ANPR Status" OSD layer to see the detected license plate numbers and their confidence
values and then set the desired minimum confidence level based on the results.
•
Ignore same plate for (s): Set a time limit for previously-read license plates. This value deter-
mines a waiting time in seconds before the same license plate is read again.
•
Country preference: The selected region is prioritized and read with a higher confidence value
by the license plate reading system. In comparison, license plates from other regions are ma-
naged with a lower confidence value.
Both the detector and the engine must be present on the camera to operate the system. They are
only available for cameras designed to read license plates.
Although the ANPR engine recognizes the license plates in the image, to make it work properly, the
area around the license plate must be visible (front or rear of the vehicle).