Dahua NVR52-4KS2 Series User Manual page 290

Step 2 Select channel and AI type.
Click Add to add a rule.
Step 3
On the Type list, select Loitering Detection.
Step 4
Step 5 Draw the detection rule.
1. Click to draw a rectangle on the surveillance video image. Right-click the image to
stop drawing.
Figure 5-156 IVS
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User's Manual