Vivotek IZ7151 User Manual download pdf (Page 50)

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50 - User's Manual

NOTE :

► In a privacy mask window, motion detection will not take effect.

WindowA

► How does motion detection work?

B D

There are two parameters for setting the motion detection: 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 sense a slight movement while smaller sensitivity settings

tend to neglect it. 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

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Vivotek IZ7151 User Manual Page 50