Vivotek FD8335H Manuel d'utilisateur télécharger pdf (Page 107)

VIVOTEK

User's Manual - 107

NOTE

► 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

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Vivotek FD8335H Manuel d'utilisateur Page 107