Bosch NDN-733 FW5.6 User Manual download pdf (Page 84)

Camera Browser Interface Setting up VCA | en 91

Bosch Security Systems Software manual AM18-Q0635 | v5.6 | 2013.01

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.

Scene too dark

Activate this function if tampering associated with covering the

objective (for instance, by spraying paint on it) should trigger

an alarm. The average brightness of the scene provides a basis

for recognition.

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Bosch NDN-733 FW5.6 User Manual Page 84