Canon VB-S800VE Operation Manual page 170

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.
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.
1 Follow the steps below to configure the passing detection line in the video display area.
In the video display area, click the start point of the detection line.
▼
Click another point.
The passing detection line will be set between the start point and next point you clicked.
170
Change Ratio indicator
Profile lines of detected tampered object