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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).
Percentage is a value that expresses the proportion of "alerted pixels" to all pixels in the motion
detection window. In this case, 50% of pixels are identified as "alerted pixels". When the percentage
is set to 30%, the motions are judged to exceed the defined threshold; therefore, the motion window
will be outlined in red�
For applications that require a high level of security management, it is suggested to use higher
sensitivity settings and smaller percentage values�
C
D
VIVOTEK
User's Manual - 99
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