3
Enter a descriptive name in the Label box.
4
Enter a value (in seconds) for the Sampling duration.
This parameter enables you to capture the background of a scene only and have specific
elements such as moving objects filtered out of the image. With a longer time span for
the sampling duration, persons passing in front of the camera, for example, or cars
driving on a highway can be smoothed out to prevent them from triggering a changed
scene alarm.
5
Click the Sample reference button.
The current image is sampled.
Reference image 1 created
11.11.3.2
Mask the ROI
You can use the ROI settings section to exclude portions of the image from monitoring, as
explained earlier in the Region of Interest section.
Region of less interest masked
11.11.3.3
Compare images
Tamper Detect compares the current scene with all available reference images. If a match is
found a green crosshair is superimposed on the image in the Feedback view. Information
about the matched image and the match level is displayed under the Feedback view.
The small green circle in the middle of the image indicates the amount of camera movement
that is allowed. A position alarm is raised when the green circle is outside the crosshair
centre. For information about adjusting the amount of allowed camera movement, see
Position Measurement.
If no match is found a BLOCKED OR CHANGED SCENE alarm is raised.
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