Honeywell Rapid Eye, Руководство администратора

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Rapid Eye Multi-Media DVR System Administrator Guide
Document 800-02953V4 Rev A 133
03/10
Scene Changed. 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 and causes a momentary scene
change is not considered sabotage unless that person remains in the scene for more than
48 seconds. For more information see
Scene Changed Tamper Detection on page 133 .
To search the event log, use an Event search session. See Using an Event Session to
Search the Event Log on page 210 .
Scene Changed Tamper Detection
Good Image
A Good Image is reported (see Figure 7-12 , to the left of the Reset button) 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 Changed is selected, or its threshold changed, the Multi-Media unit learns
about the scene displayed by the camera.
Learning
is reported, to the left of Scene
Changed, for 2 to 3 minutes, depending on the complexity of the scene. Do not blind or
blur a camera while
Learning
is displayed. When the learning ends,
Running
is displayed
to the left of Scene Changed.
Reset is enabled when Scene Changed is enabled. Clicking Reset starts Learning again,
and should be used whenever the camera is moved intentionally to view a different scene,
or if the scene lighting or content changes dramatically. Reset has no effect on Blind and
Blur tamper detection.
Rows of Mobile Objects
Scene Changed is sensitive to large scale changes in a scene. For example, using Scene
Changed for a camera that shows many chairs in rows—such as in an airport or casino—
may not be effective. Clicking Reset while people are sitting makes the unit learn that sitting
persons are not to be considered as sabotage. When the chairs empty, the scene may have
changed enough for the unit to trigger a log entry or alarm. And if the operator makes the
unit learn when the chairs are empty, tamper detection may be triggered when people sit
in the chairs. The same can be said for a row of vehicles that are frequently moved, such
as a taxi stand or truck depot.
Alarms
After rearming an alarm produced by the Scene Changed type sabotage detection, move
the camera back to the scene that you need to monitor, and click Reset.