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Network Video Recorder User Manual
126
Time Threshold: The time of the objects removed from the region. If the value is 10,
alarm is triggered after the object disappeared from the region for 10s. Its range is
[5s-20s].
Sensitivity: The similarity degree of the background image. Usually, when the sensitivity is
high, a very small object taken from the region can trigger the alarm.
18) Click Draw Region and draw a quadrilateral in the preview window by specifying four
vertexes of the detection region.
Step 7 Set the arming schedule. Refer to Chapter 11.1 Configure Arming Schedule.
Step 8 Set the linkage actions. Refer to Chapter 11.2 Configure Alarm Linkage Actions.
Step 9 Click Apply.
12.9 Audio Exception Detection
Purpose:
Audio exception detection detects the abnormal sounds in the scene, such as the sudden
increase/decrease of the sound intensity.
Step 1 Go to System > Event > Smart Event.
Step 2 Click Audio Exception.
Figure 12-10 Audio Exception Detection
Step 3 Select a Camera to configure.
Step 4 Optionally, check Save VCA Picture to save the captured pictures of audio exception
detection.
Step 5 Follow the steps to set the detection rules.
4) Select the Exception Detection tab.
5) Check the checkboxes of Audio Loss Exception, Sudden Increase of Sound Intensity
Detection, or Sudden Decrease of Sound Intensity Detection.
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