VCS VideoJet X.21, Manual

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Advanced Features
70
VideoJet X.21/G.703
Manual
Video Motion Detection Feature
The
VideoJet
es
transmitter has the ability to autonomously
check the video input for significant motion in the scene and to trig-
ger an alarm in case the detected motion exceeds a preset thresh-
old. Motion detection is activated with
NCTerminal
in the dialog
“Alarm inputs” under “Motion detection sensitivity” with the selec-
tion button “On” and then confirmed with the “Set” button.
The sensitivity of the motion detector can be selected in the same
menu. This parameter needs to be adapted to the requirements of
the particular application. The best setting should be determined
experimentally.
The motion detector can be switched on and off and its sensitivity
altered with
NCTerminal
.
If motion is detected in a picture and an alarm is triggered, it is pos-
sible, for example, to switch a relay at the receiving end in order to
trigger an alarm in a surveillance centre.
Note that higher sensitivity will result in a lower robustness against
noise and spurious motion in the scene. This may lead to unwanted
erroneous detections and consequently increase the rate of false
alarms.