Canon ME20F-SHN Network Operation Manual page 125

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In [Change Ratio (%)], you can set the ratio of screen change for the entire video display area to determine as
tampering detection.
When the setting values or slider is changed, an indicator representing the ratio of the entire video display area is
shown for one second in the center of the video display area allowing you to check while specifying the setting.
Change Ratio indicator
Detection Status for Camera Tampering Detection
Moving objects detected are displayed with profile lines.
If an object is smaller than [Change Ratio (%)], its profile lines are white.
If the obscured area in the video exceeds [Change Ratio (%)], profile lines take on the same color as the detection
area, indicating that the camera has "detected" tampering.
Profile lines of detected tampered object
Note
Detection will not be possible for three seconds after the change ratio for camera tampering detection is changed, or when
switching to camera tampering detection settings from settings for another detection mode.

How to Configure Passing Detection
The detection line for passing moving objects is determined by setting the passing direction and object decision
point.
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