Calibration Of Tamper Detection; Scene Change-Type Tamper Detection: Learning - Honeywell rapid eye System Administrator Manual

Enhancing Video for Security

Calibration of Tamper Detection

Fig. 7–15. Calibration of Blind-type tamper detection.
Detection meter
Above each slider for setting the detection threshold of Blind, Blur and Scene Change, a meter
shows the tamper detection activity. The meter is green when activity is below the threshold, and
red when the activity is above. If there is no activity, the meter is empty. See figure 7–15.
Blind. A camera can be blinded by too much light or too little. To calibrate, cover the camera with
an opaque cloth or box, or prop a strong light in front of the camera. Blinding a camera also
triggers the Blur-type and Scene Change-type of sabotage. Note that turning lights on/off at the
scene can indirectly blind a camera. Panning a PTZ camera from a light colored scene to a darker
scene (or vice versa) can also have that effect. Lowering the threshold can compensate.
Blur. It is not recommended to alter a camera's focus after installation. To simulate sabotage of
focus, use a lens-like sheet of glass or plastic, or a transparent container of water, and prop it in
front of the camera, during calibration.
Scene Change. See the next section.
Forty-eight seconds
Activity in a scene that could be considered as sabotage drives the meter from green to red. If
such activity lasts less than 48 seconds, it does not trigger an alarm or log entry. This is designed
to calibrate tamper detection and to reduce the number of false positives. For example, a person
walking by a camera at close range and blinding the camera is not considered sabotage unless
that person remains in front of the camera for more than 48 seconds.
Event log
To search the event log, use an Event session. See

Scene Change-type Tamper Detection: Learning

Good Image
A "Good Image" is reported, to the left of Reset, when a scene has enough features for the unit to
detect if someone or something has moved the camera, and sabotage can be inferred. A "Bad
Image" is reported when the image is indistinct, for example, if the camera is pointed at a wall of
uniform color.
From Learning to Running
When Scene Change is selected, or its threshold changed, the Multi-Media unit "learns about" the
scene shown by the camera; "Learning" is reported, to the left of Scene Change, for 2 minutes to
a maximum of 3 minutes. Do not blind or blur a camera while "Learning" is displayed. When
learning ends, "Running" is displayed to the left of Scene Change.
122
Event Session: to Search the Log of Events, p. 198.