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Bosch Security Systems Operating Instructions V 2.5 | 2007.6
4. If necessary, click Select all to select the entire video
frame for monitoring.
5. Right-click any fields you wish to deactivate.
6. Click OK to save the configuration.
7. Click the close button (X) in the window title bar to close
the window without saving the changes.
7.12.5 Tamper detection
You can detect the tampering of cameras and video cables by
means of various options. Run a series of tests at different
times of the day and night to ensure that the video sensor is
operating as intended.
Sensitivity
The basic sensitivity of the tamper detection can be adjusted
for the environmental conditions to which the camera is sub-
ject. The algorithm reacts to the differences between the refer-
ence image and the current video image. The darker the
observation area, the higher the value that must be selected.
Trigger delay
You can set delayed alarm triggering. 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 allows you to avoid false alarms triggered by
short-term changes, for example cleaning activities in the direct
field of vision of the camera.
Scene too bright
Activate this function if tampering associated with exposure to
extreme light (for instance, shining a flashlight directly on the
i
NOTE!
This and the following parameter are only accessible if the
reference check is activated.