Dahua DH-XVR5416L-X User Manual page 197

Step 2 Configure the settings for the face detection parameters. See Table 5-46.
Parameter Description
In the Channel list, select the channel that you want to configure
the face detection settings.
Channel
Only the analog channel 1 supports this function.
Enable Enable or disable the face detection function.
Click Setting to draw areas to filter the target.
You can configure two filtering targets (maximum size and
Rule
minimum size). When the target is smaller than the minimum size
or larger than the maximum size, no alarms will be activated. The
maximum size should be larger than the minimum size.
Define a period during which the detection is active.
Period For details, see "Setting Motion Detection Period" section in
"5.10.4.1 Configuring Motion Detect Settings."
Click Setting to display setting interface.
Enable alarm activation function. Select the alarm output port(s) to
Alarm Out which the peripheral alarm devices are connected. When an alarm
event occurs, the system links the peripheral alarm devices
connected to the selected output port.
Set a length of time for the Device to delay turning off alarm after
Latch the external alarm is cancelled. The value ranges from 0 seconds
to 300 seconds. If you enter 0, there will be no delay.
Figure 5-143
Local Configurations 181