Dahua NVR100 series User Manual page 433

Click to draw filter object. See Figure 5-75.
Select the blue line and then use mouse to adjust zone size.
Note
Each rule can set two sizes (min size/max size). Once the object is smaller than the min size or larger
than the max size, there is no alarm. Please make sure the max size is larger than the min size.
Click Ok to complete the rule setup.
Figure 5-74
Figure 5-75
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