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1. Go to the settings panel of the Detection of moving against crowd flow object that is created on the basis of the Camera object on the Hardware tab of the System Settings window.
   
2. Click the Settings button. The Detection settings window opens.
3. Specify the area of interest on the video:
   1. On the Select area tab, click the Stop video button to pause the video.
   2. Click the Area of interest button.
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   3. On the captured video image, set the detection area using the mouse. To do that, specify the nodes of the polygon that restricts it. The area is considered to be specified when the last nodal point is consistent with the first one. You can add only one area. When you try to add the second area, the first one is deleted. After you add the area, the remaining part of the video image is darkened.

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      title Note
      To remove the area, click the Image Removed Image Added button to the right of the Area of interest button.

   4. Click the Size of person button. Set the required person size using the mouse. To do this, click the captured frame and extend the rectangle to the required size.

      Info
      title Note
      To remove the specified person size, click the Image Removed the Image Added button to the right of the Size of person button.

4. Set up the parameters of detection of moving against crowd flow:
   1. Go to the Parameters tab.
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   2. In the Detector sensitivity [0.0, 1.0] field, specify the detector's sensitivity to detecting moving objects in the area of interest. The optimal value of the parameter is selected experimentally by testing the detector for event generation in the required conditions. The range of values is from 0 to 1. The higher the sensitivity, the greater the probability of false alarms. The less the sensitivity, the greater the probability of missing an event.
   3. In the Number of people in crowd field, specify the minimum number of people moving in the direction of a crowd in which the detector must generate an event. The default value is 4.
   4. Set the Against crowd direction switch to the position corresponding to the object movement against a crowd on the video image: Up or Down.
   5. In theFrames processed per second [0.016, 100] field, set the number of frames per second that the detector processes in the range 0.016–100. The higher the value, the more accurately the detector works, but the higher the load on the CPU.
5. Click the OKbutton.

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