Vivotek VS8102 Instrukcja Użytkownika Pobierz pdf (Strona 60)

VIVOTEK

60 - User's Manual

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 dened threshold.

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 video server 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.

Percentage = 30%

B D

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 135 136

Brak uwag

Vivotek VS8102 Instrukcja Użytkownika Strona 60