Dahua XVR User Manual page 135

Note
 The face detection function is valid once your network camera or your DVR supports
this function.
 If your purchased DVR supports the face detection function, it supports one analog
channel. It is not for the digital channel.
System can detect and filter the human face via analyzing the video. When it detects
the human face in the specified zone, it can draw the rectangle around the human face
and trigger record, snapshot, alarm operation and etc. See Figure 3-133.
 Channel: Select a channel you want to enable face detect function.
 Alarm face number: Once the detected human face number reaches the threshold you
set here, system can generate an alarm.
 Human face RO (region of interest): Check the box, system can highlight the human
face region.
Enable: Check the box here to enable face detect function.

For detailed setup information, please refer to chapter 3.11.3.2.
3.11.3.4 Alarm
Important
Figure 3-133
126