User Manual

Network Video Recorder User Manual
UM NVR v4.xx 111717NA 135
Time Threshold: The time of the objects removed from the region. If the value is 10, alarm
will be triggered after the object disappears from the region for 10s. Its range is
[5s-20s].
Sensitivity: The similarity of the background image. If the sensitivity is high, a very small
object taken from the region will trigger the alarm.
3) Click Draw Region and draw a quadrilateral in the preview window by specifying
four vertices of the detection region.
Step 7 Set the arming schedule. Refer to Chapter 12.1 Configuring Arming Schedule.
Step 8 Set the linkage actions. Refer to Chapter 12.2 Configuring Alarm Linkage Actions.
Step 9 Click Apply.
13.9 Audio Exception Detection
Purpose
Audio exception detection detects abnormal sounds in the surveillance scene such as a
sudden increase/decrease in sound intensity.
Step 1 Go to System > Event > Smart Event.
Step 2 Click Audio Exception.
Figure 13-9 Audio Exception Detection
Step 3 Select a camera to configure.
Step 4 Optionally, check Save VCA Picture to save the captured audio exception detection
pictures.
Step 5 Set the detection rules: