Dahua N41C1P User Manual page 171

Step 2 Select channel and Analytics+ type.
Step 3 Click Add to add a rule.
Step 4 On the Type list, select Crowd Gathering Estimation.
Step 5 Draw the detection rule.
1) Click to draw a rectangle on the security video image. Right-click the image
to stop drawing.
Figure 5-123 IVS
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User's Manual