Configuring License plate recognition (RR)

To configure License plate recognition (RR), do as follows:

1. Download Addon RR LPR from the website and install it.
2. Create the detection object you need and select it (1). 
   

3. If you require using this detection tool for real-time number plate recognition (see Configuring real-time vehicle license plate recognition), set the corresponding parameter to Yes (2).

4. If you need to enable recording of metadata, select Yes from the Record Objects tracking list (3).
5. If a camera supports multistreaming, select the stream for which detection is needed. Selecting a low-quality video stream allows reducing the load on the Server (4).
6. Select your target country from the list (5).

7. Analyzed framed are scaled down to a specified resolution (2, 1920 pixels on the longer side). This is how it works:

   1. If the longer side of the source image exceeds the value specified in the Frame size change field, it is divided by two.

   2. If the resulting resolution falls below the specified value, it is used further.

   3. If the resulting resolution still exceeds the specified limit, it is divided by two, etc.

      Note

      For example, the source image resolution is 2048 * 1536, and the limit is set to 1000.

      In this case, the source resolution will be divided two times (down to 512 * 384): after the first division, the number of pixels on the longer side exceeds the limit (1024 > 1000).

8. Specify the maximum number of recognition threads (7). If the value is 0,the recognition process will occur in the same thread that starts it.
   

   Attention!

   The cumulative value of this parameters across all LPR detection tools must not exceed the number of CPU cores and is limited to 100.

9. Set minimum quality of ANPR (8). The higher the minimum recognition quality, the less false detections will occur.

10. Specify the time interval between the initial recognition and event registration in theTimeoutfield (12).Zerovalue sets the event registration to the moment when the track disappears from FOV.
    

    Note

    Skip this step with License plate recognition - Search in archive (RR).

11. You can configure an ANPR zone in FoV. The zone is resized by moving the anchor points . 
    

    Note

     For your convenience, you can click the  button and configure the mask on a still frame / snapshot. To undo, click this button again.

    Note

    Detection zone is displayed by default. You can click the  button to hide the zone. To undo, click this button again.

12. Click the Apply button.

Configuration of  License plate recognition (RR) is now complete.