Vivotek VS8801 User Manual page 66

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A green bar indicates that even though motions have been detected, the event has not been triggered
because the image variations still fall under the defined threshold.
This motion detection window will also be displayed on the Event Settings page. You can go to
Application > Event Settings > Trigger to choose it as a trigger source. Please refer to page 79 for
detailed information .
NOTE:
► How does motion detection work?
A
B
There are two motion detection parameters: Sensitivity and Percentage. In the illustration above,
frame A and frame B are two sequential images. Pixel differences between the two frames are
detected and highlighted in gray (frame C) and will be compared with the sensitivity setting. Sensitivity
is a value that expresses the sensitivity to moving objects. Higher sensitivity settings are expected to
detect slight movements while smaller sensitivity settings will neglect them. When the sensitivity is set
to 70%, the Network Camera defines the pixels in the purple areas as "alerted pixels" (frame D).
66 - User's Manual
Percentage = 30%
C
D