Sony SNC-EMX Serie Manuel D'utilisation page 83

84 en | Configuration
Metadata is always created for a video content analysis, unless this is explicitly excluded.
Depending on the analysis type selected and the relevant configuration, additional information
overlays the video image in the preview window next to the parameter settings. With the
Motion+ analysis type, for example, the sensor fields in which motion is recorded are marked
with rectangles.
Aggregation time [s]
Set an aggregation time of between 0 and 20 seconds. The aggregation time always starts
when an alarm event occurs. It extends the alarm event by the value set. This prevents alarm
events that occur in quick succession from triggering several alarms and successive events in a
rapid sequence. No further alarm is triggered during the aggregation time.
The post-alarm time set for alarm recordings only starts once the aggregation time has
expired.
Alarm status
The alarm status is displayed here for information purposes. This means you can check the
effects of your settings immediately.
Click Configuration to set up the analysis type.
Tamper detection
Detect 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.
Reference check
Save a reference image that can be continuously compared with the current video image. If
the current video image in the marked areas differs from the reference image, an alarm is
triggered. This detects tampering that would otherwise not be detected, for example, if the
camera is turned.
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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.
Disappearing edges
The area selected in the reference image should contain a prominent structure. If this
structure is concealed or moved, the reference check triggers an alarm. If the selected area is
too homogenous, so that concealing and moving the structure would not trigger an alarm,
then an alarm is triggered immediately to indicate the inadequate reference image.
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Click Reference to save the currently visible video image as a reference.
Click Add mask and select the areas in the reference image that are to be ignored. Click
Set to apply.
Check the box Reference check to activate the on-going check. The stored reference
image is displayed in black and white below the current video image.
Select the Disappearing edges or Appearing edges option to specify the reference check
once again.
User manual
Network camera
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