Digital Video Recorder User Manual 
 
153 
 
Please refer to the Chapter 9.4 Intrusion Detection for operating steps to configure the 
unattended baggage detection.   
 
The Threshold [5s-20s] in the Rule Settings defines the time of the objects left over in the 
region. If you set the value as 10, alarm is triggered after the object is left and stay in the 
region for 10s. And the Sensitivity defines the similarity degree of the background image. 
Usually, when the sensitivity is high, a very small object left in the region can trigger the 
alarm. 
 
Up to 4 rules can be configured.   
10.12 Object Removal Detection 
Purpose 
Object removal detection function detects the objects removed from the pre-defined region, such 
as the exhibits on display, and a series of actions can be taken when the alarm is triggered. 
   
 
Please refer to the Chapter 9.4 Intrusion Detection for operating steps to configure the 
object removal    detection.   
 
The Threshold [5s-20s] in the Rule Settings defines the time of the objects removed from 
the region. If you set the value as 10, alarm is triggered after the object disappears from 
the region for 10s. And the Sensitivity defines 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. 
 
Up to 4 rules can be configured.   
10.13 Audio Exception Detection   
Purpose 
Audio exception detection function detects the abnormal sounds in the surveillance scene, such as 
the sudden increase/decrease of the sound intensity, and some certain actions can be taken when 
the alarm is triggered. 
   
The audio exception detection is supported by all analog channels.   
Step 1 Go to Menu > Camera > VCA. 
Step 2 Select the camera to configure the VCA.   
You can check the checkbox of Save VCA Picture to save the captured pictures of VCA 
detection.   
Step 3 Select the VCA detection type to Audio Exception Detection.