To configure the LPR channel detector, do the following:

  1. Go to the settings panel of the LPR channel object corresponding to the activated software module (see Activating the software module used for identifying license plates).

    The availability of the parameters depends on the activated software modules (for details, see The settings panel of the LPR channel object).

  2. Specify the Area search threshold parameter.

  3. Specify the Max. width and Max. height parameters:

    1. Click the button next to the parameters. An interactive interface for setting up parameters of an area opens. It represents an image from the corresponding camera.

    2. At the required moment, click the Stop video button, then select the required area using the left mouse button and click the OK button.

      You can select the required area in the same way in the Live video mode. 

      Results of setting area parameters are automatically entered in the Max. width and Max. height fields.

      We don't recommend setting maximum sizes greater than required, as this slows down the processing but doesn't improve the recognition quality.

  4. Specify the Min. width and Min. height parameters similarly to the Max. width and Max. height parameters using the button.

  5. If necessary, set the Cut image with vehicle checkbox.

    The Cut image with vehicle option is used only when you work with megapixel surveillance cameras.

  6. If necessary, set the Allow recognition by request checkbox.

    Image recognition by request works only for the RR (see Searching for a license plate by image) and VT (see Search for a license plate by image for the VT recognition module) modules. For this, use the POST http://IP address:port/lprserver/FindNumbersByImage query.
    The response can contain the following errors:


    1. In this case, the Allow recognition by request checkbox isn't set.


    2. In this case, an image of the incorrect base64 format is used: you must convert the video frame to the JPEG format and not save it in the JPG format.


    3. In this case, you used the Uragan module during the operation; image recognition by request isn't supported.
  7. Click the Apply button.

Configuring the LPR channel detector is complete.