Network Camera User Manual 
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Figure 10-17 Configuring Defocus Detection 
2.  Check the checkbox of Enable to enable the function. 
3.  Click-and-drag  the  slider  to  set  the  detection  sensitivity.  The  sensitivity  value 
ranges from 1 to 100, and the higher the value is, the more easily the defocus 
image can trigger the alarm. 
4.  Select  the  linkage  methods  for  defocus,  including  Notify  Surveillance  Center, 
Send Email and Trigger Alarm Output. 
5.  Click Save to save the settings. 
10.2.3 Configuring Scene Change Detection 
Purpose: 
Scene change detection function detects the change of surveillance environment 
affected by the external factors, such as the intentional rotation of the camera. Some 
certain actions can be taken when the alarm is triggered. 
Note: Scene change detection function varies according to different camera models. 
Steps: 
1.  Enter the Scene Change Detection settings interface, Configuration > Event > 
Smart Event > Scene Change Detection.