Dahua NVR21-4KS3 Series User Manual page 280

2) Click
The system triggers an alarm only when the size of detected target is between the
maximum size and the minimum size.
3) Configure parameters.
Table 5-39 Parameters of missing object detection
Parameter
Preset
Name
Duration
4) Click OK.
Step 6 Configure alarm schedule and linkage.
Figure 5-153 Missing object
to draw the minimum size or maximum size to filter the target.
Description
Set the preset point for IVS detection according to the actual needs.
Customize the rule name.
Set how long the object stays until the alarm is triggered.
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