Vivotek SD8322E User Manual download pdf (Page 99)

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User's Manual - 99

► How does motion detection work?

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 denes 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 identied as “alerted pixels”. When the percentage

is set to 30%, the motions are judged to exceed the dened 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.

B D

NOTE:

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Vivotek SD8322E User Manual Page 99