Vivotek 3GPP User Manual download pdf (Page 64)

VIVOTEK

64 - User's Manual

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

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 147 148

No comments

Vivotek 3GPP User Manual Page 64