Bosch VIDEOJET X40 - Manual (Page 67)

VideoJet X40 Configuration Using a Web Browser | en 67
Bosch Security Systems Installation and Operating Manual V3.5 | 2007.12
5.23.6 Select area (MOTION+ only)
The areas of the image to be monitored by the motion detector can be selected. The video
image is subdivided into 858 square fields. Each of these fields can be activated or
deactivated individually. If you wish to exclude particular regions of the camera's field of view
from monitoring due to continuous movement (by a tree in the wind, etc.), the relevant fields
can be deactivated.
1. Click Select area to configure the sensor fields. A new window will open.
2. If necessary, click Clear all first to clear the current selection (fields marked yellow).
3. Left-click the fields to be activated. Activated fields are marked yellow.
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.
5.23.7 Tamper Detection
You can reveal 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.
5.23.8 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.
5.23.9 Trigger delay (s)
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.
5.23.10 Global change
You can 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 you to detect, independently of motion alarms, manipulation of the
orientation or location of a camera resulting from turning the camera mount bracket, for
instance.
i
NOTICE!
The options for tamper detection can only be set for fixed cameras. Dome cameras or other
motorized cameras cannot be protected in this manner as the movement of the camera itself
causes changes in the video image that are too great.
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NOTICE!
This and the following parameter are only accessible if the reference check is activated.