Page History

...

1. Go to the Crowd detection tab.
   
2. In the Head size [3, 100] field, specify in the range 3–100 what part of the video image height is the human head. The specified fractional value is rounded to an integer value when you switch to another field or save the settings. The default value is 3.

3. In the Occupancy field, specify as a percentage the share of the detection zone area that must be filled in order for the detector to record the beginning of the Crowd event. If the occupancy remains longer than the time threshold specified in the Reaction time (s) field, the Crowd alarm event is generated on the detector. The default value is 50.

4. In the Reaction time (s) field, specify in seconds the time interval after which the Crowd alarm event is generated on the detector if the value of the Occupancy parameter remains equal to or above the set threshold. If during the specified period of time the value of this parameter drops below the threshold value, then the time counting stops and the counter is reset to zero. The default value is 100.

5. In the Time between alarms (s) field, specify in seconds the frequency of the Crowd alarm event generation. The default value is 180.

6. In the Number of analytics streams field, specify the number of video streams that are used for neural network analytics. The default value is 4.
7. To save the detector settings, click the OK button.
To save the changes, click the Apply button

The Postprocessing tab

You can use this tab to configure object filters or object counting filters according to the option selected from the Detection filtering drop-down list in the basic settings of the detector.

Object filter

1. To enable the object filter, select Object filter from the Detection filtering drop-down list in the basic settings of the detector.
2. Go to the Postprocessing tab.
3. From the Object filter list on the left, select one or more objects. When these objects are detected, the detector doesn't generate an event, and the event isn't displayed in the event viewer or on the screen.
   Image Added
   

   Info
   title Note
   To remove the filter, click it again.

   
   
4. To apply the filter, click the Apply filter configuration button.

Object counting filter

1. To enable the object counting filter, select Object counting filter from the Detection filtering drop-down list in the basic settings of the detector.
2. Go to the Postprocessing tab.
3. Click the Add count filter button. In the section on the right, select one or more object counting filters.
   Image Added
   
4. In the Min and Max fields, set the lower and upper threshold values for each object counting filter. If the number of objects of a given type in the detection area is within this range, the detector generates an event that is also displayed in the event viewer and on the screen. If the number of objects is greater or less than the set range, or there are no objects at all, then all events are filtered out and aren't displayed in the event viewer or on the screen.
   

   Info
   title Note
   To remove the filter, click the cross to the right of it.

   
   
5. To apply the filter, click the Apply filter configuration button.

Click the OK button to save all settings of the detector. The Detection settings window closes, and you return to the detector settings panel.

To save all changes, click the Apply button on the settings panel of the VI detection of crowd object.

...