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Configuring the Transmitter Chapter 6
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Average [n frames]
It is possible to define the number of frames in which a movement is detected in
order to generate an alarm. This can help prevent false alarms from events such
as a bird flying through the surveillance area.
– Select the desired value by dragging the scroll thumb to the desired position.
Object min size [n*n blocks]
You can specify the number of sensor cells that a moving object must cover to
generate an alarm. This can prevent objects that are too small from triggering an
alarm.
A minimum value of 2 (2 × 2 sensor fields) is recommended.
– Select the desired value by dragging the scroll thumb to the desired position.
Alarm indicator
To prevent false alarms, a threshold can be applied to the motion signal. This
allows effects such as the background noise from the camera itself to be filtered
out.
The blue line in the illustration represents the alarm threshold. Any value above
this level will trigger an alarm. The parts of the motion signal line which will cause
an alarm are shown in red. The alarm threshold can be set higher or lower to suit
your needs.
– Observe the amplitude of the displayed movement signal over a longer period
of time under all the lighting conditions that may be encountered.
– Move the pointer over the blue line.
– Press the left mouse button in and drag the line to the desired level.
Motion tracking
In some situations you may want an alarm triggered only if movement takes place
in a particular direction. In such cases, enable motion detection and select the
direction of movement required to trigger an alarm.
– Select On to enable the motion tracking feature of the video sensor.