Bosch FW5.50 Software Manual page 72

72 en | Setting up VCA
Sensitivity and Trigger delay [s] can only be changed if
Reference check is selected.
Sensitivity
The basic sensitivity of the tamper detection can be adjusted
for the environmental conditions to which the camera is
subject. The algorithm reacts to the differences between the
reference image and the current video image. The darker the
observation area, the higher the value that must be selected.
Trigger delay [s]
Set delayed alarm triggering here. The alarm is only triggered
after a set time interval in seconds has elapsed and then only if
the triggering condition still exists. If the original condition has
been restored before this time interval elapses, the alarm is not
triggered. This avoids false alarms triggered by short-term
changes, for example, cleaning activities in the direct field of
vision of the camera.
Global change (slider)
Set how large the global change in the video image must be for
an alarm to be triggered. This setting is independent of the
sensor fields selected under Select Area. Set a high value if
fewer sensor fields need to change to trigger an alarm. With a
low value, it is necessary for changes to occur simultaneously in
a large number of sensor fields to trigger an alarm. This option
allows detection, independently of motion alarms, manipulation
of the orientation or location of a camera resulting from turning
the camera mount bracket, for example.
Global change
Activate this function if the global change, as set with the
Global change slide control, should trigger an alarm.
Scene too bright
Activate this function if tampering associated with exposure to
extreme light (for instance, shining a flashlight directly on the
objective) should trigger an alarm. The average brightness of
the scene provides a basis for recognition.
AM18-Q0611 | v5.50 | 2012.03 Software manual
Camera Browser Interface
Bosch Security Systems