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The LPR channel enables license plate recognition upon request

using the Camera of recognition upon request object. This object allows you to configure the camera so that it captures and sends a video image to the recognition module after a specific trigger activates.

 It can be, for example, a macro, a script, or some event.

In order to configure the recognition upon request, create the Camera of recognition upon request child object on the basis of the LPR channel parent object.

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On the settings panel of the Camera of recognition upon request object, in the Camera drop-down list, select the camera that will work on request from the list of cameras displayed in the Video capture device tree.

Configure the recognition upon request as follows:

1. Go to the Camera of recognition upon request settings panel under the LPR channel parent object.
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2. From the Camera dropdown list (1), select the camera that will work upon request. 

   Info
   title Note
   The same camera can be selected in several Camera of recognition upon request objects. If the camera has been selected on the settings panel of the Camera of recognition upon request object, it cannot be selected on the settings panel of the LPR channel object (see Selecting the video cameras to work with the LPR channel).

   
   

3. Set the Search area (2) checkbox checked in order to enable setting the search area border of the license plate in the frame. 
   In the Left, Top, Right and Bottom fields sets manually or using the Image Added button (3) - by clicking this button the interactive interface of setting search area borders of the license plate appears.

   Info
   title Note
   The values in the Left, Top, Right and Bottom fields are specified in percentage to the viewing tile size.

   
   

4. Set the maximum and minimum size of license plates in Detection settings:

   1. Set the Max.width and Max.height parameters manually or using the Image Added button (4) - by clicking this button the interactive interface of setting the zone parameters appears.

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   2. When required click the Stop video button, select the required area using the left-click and then click OK. 
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      Results of setting zone parameters will automatically appear in the Max.width and Max.height fields.
      Set the Min.width and Min.height parameters the same way as Max.width and Max.height.

5. For the Frame count (5) parameter set the number of frames that will be analyzed when recognizing the license plate.

   Info
   title Note
   It is recommended to set the number of frames to no more than 1.

   
   

6. Set the Zooming (6) checkbox checked in order to speed up the lpr for megapixel cameras without any quality loss .The request, which will trigger the camera, can be configured in two ways:

   Info
   title Note
   This checkbox is relevant only when the width oh the Search area is more than 150 pixels. The recognition speed increases:  - 2 times if the value of the Width parameter is more than 150 pixels; - 4 times if the value of the Width parameter is more than 400 pixels; - 8 times if the value of the Width parameter is more than 800 pixels.

   
   

7. Check the Select with best recognition accuracy box (6) to show the recognition results with the highest accuracy rate, as the bigger LP size does not always grant better recognition accuracy.
8. Check the Select with biggest LP box (7) to show the results with the biggest LP sizes.
9. From the Priority country drop-down list (8) select the country which LPs should be shown first.
10. Click the Apply button (9)

1. .

The request, which will trigger the camera, can be configured in two ways:

1. Using a macro. To do this, switch to the the Programming tab in  tab in Intellect and  and select the the Macros item  item in the programming tools tree. A window for creating a macro will open, enabling you to create an event of any complexity that will trigger the recognition upon request. An example of the simplest macro for recognition upon request is shown in the figure below. For details on working with macros, see Creating macros.

   

2. Using a script or the IIDK interface. To do this, switch go to the the Programming tab  tab in Intellect and select the the Scripts item  item in the programming tools tree. A window for creating a script will open, enabling you to create an event of any complexity that will trigger the recognition upon request.  For details on working with scrfiptsscripts, see see Creating a script.An example of a simple script for working with a camera for recognition upon request is shown below.

   Code Block
   language js
   QUERY_CAMERA|ID|RECOGNIZE

   where ID is ID of the camera in the the Intellect object  object tree. 

   For details on the IIDK interface, see Intellect Integration Developer Kit (IIDK).

   InfoAt the moment of this writing, the functionality described in this section works only with the CARMEN and VIT recognition modules

   License plate recognition upon request is now configured.