VCS VideoJet 10 Handbuch Seite 186

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VideoJet 10
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Local sensitivity
The basic sensitivity of the video sensor can be adapted for the
ambient camera conditions.
The sensor reacts to brightness variations in the video image. The
darker the observation range, the greater the value that must be
selected here.
Adjust the sensitivity by moving the slider to the desired setting with
the mouse key held down.
Average n [frames]
It is possible to define the number of frames during which a move-
ment is monitored in order to generate an alarm. In this way, it is
possible to prevent generating a false alarm, e.g. by a bird flying
across the surveillance area.
Select the desired value by moving the slider to the desired position
with the mouse key held down.
Object min size [n*n blocks]
The number of sensor cells, which a moving object must cover in
order to generate an alarm, can be specified. In this way it is pos-
sible to prevent too small objects from producing an alarm.
For this, the minimum recommended value is 2 (2 × 2 sensor fields).
Select the desired value by moving the slider to the desired position
with the mouse key held down.
Alarm indicator
To prevent false alarms, a motion signal can be matched to a given
alarm threshold. In this way, for example, it is possible to filter out
effects caused by the background noise generated in the camera
itself.
The blue line indicates the alarm threshold. Any value greater than
this will produce an alarm signal. The components of the motion
signal generating the alarm are indicated in red. The alarm
threshold can be varied to suit individual requirements.
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