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The Licence Plate Recognition channel enables license plate recognition upon request. This is enabled by the dedicated functionality included in the the Licence Plate Recognition channel that  that enables configuring cameras that capture images and pass send them to the recognition module after a specific trigger activates. It can be, for example, a macro, a script, or some event. This functionality is implemented on the basis of a separate object in Auto-Intellect.In order to configure the recognition upon request, create the specific object - Camera of recognition upon request - in Auto-Intellect.

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titleNote

For now this functionality is implemented for CARMEN and VIT recognition modules only.

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When using the Camera of recognition upon request object along with the VIT recognition module disable VodiCTL_VPW_DYNAMIC_ENABLE in the tweaking, i.e. set the False value of this parameter, in order to prevent repeated recognition.

Configure the recognition upon request as follows:

  1. Create the Camera of recognition upon request child object
on the basis of the
  1. under the LPR channel
parent
  1.  parent object.

2. On the settings panel of the the Camera of recognition upon request request object, in the Camera drop-down the Camera (1) dropdown list, select the camera that will work on upon request from in the list of cameras displayed in the Video  Video capture device tree tree.  

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The same camera can be selected in several Camera of recognition upon request objects.

In this case do not select camera on the LPR channel object settings panel.

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The camera cannot be selected on the settings panel of the LPR channel object if it has been selected on the settings panel of the Camera of recognition upon request object. 

3. Set the Search area checkbox checked in order to enable setting the search area border of the license plate in the frame (2). 

  • In the Left, Top, Right and Bottom fields sets manually or using the Image Added button - by clicking this button the interactive interface of setting search area borders of the license plate appears. 

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

4. Set the Zooming checkbox checked in order to speed up the lpr for megapixel cameras without any quality loss (3).The request, which will trigger the camera, can be configured in two ways:

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This checkbox is relevant only when the width oh the Search area is more than 150 pixels (see step 2). 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.

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

  • Set the Max.width and Max.height parameters manually or using the Image Added button - by clicking this button the interactive interface of setting the zone parameters appears.
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  • When required click the Stop video button, select the required area using the left-click and then click OK
    Image Added
    Results of setting zone parameters will automatically appear in the Max.width and Max.height fields.

6. Set the Min.width and Min.height parameters the same way as Max.width and Max.height (see step 5).

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

8. Click the Apply button (6).

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 scrfipts, 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
    languagejs
    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.