Unit Installation Instructions
Document K14390V1 Rev A
Securing a Camera
Forethought about poor camera angles and the possibility of tampering with cameras or
vandalism can help to assist police if an area becomes a crime scene.
When placing video cameras, consider:
Dealing with environmental lighting situations that can render a system ineffective: direct
sunshine or other strong lighting, darkness and so on. See Camera Sabotage:
Environmental factors that can hamper cameras or the lens of cameras: dust,
condensation, grease (common in food preparation areas), excessive heat or cold.
Working around camera blind spots due to: architecture, mobile equipment, vehicle
docking, construction and so on
The details of camera lens selection, camera angle, maintenance and so on, are beyond the
scope of this guide. For an in-depth reference about the field of closed-circuit television in a
security setting, see:
Kruegle, Herman, CCTV Surveillance: Video practices and technology, Butterworth–
Heinemann, Newton (MA), 1995, ISBN 0-7506-9028-3, TK6680.K78
Camera Sabotage: Detection
If installers are called upon to help test camera sabotage detection (CSD), or to repair cameras if
sabotage has occurred. There are three types of CSD:
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 for more than 48 seconds.
Less time than this does not trigger an alarm or log entry. This is designed to calibrate CSD and to
reduce the number of false positives. Blinding a camera also triggers the Blur-type and Moved-
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, once set. 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.
Moved. After a Multi SA has rearmed an alarm produced by the Moved-type sabotage detection,
move the camera back to the scene that the organization needs to monitor.
The Blind type of CSD can be used for fixed cameras and for PTZ cameras.
Blur and Moved are CSD types designed for fixed cameras only, not for PTZ use. Using pan,
tilt or zoom triggers Blur and Moved.
Calibrating rows of mobile objects
Moved is sensitive to large scale changes in a scene. For example, using Moved for a camera that
shows many chairs in a row, close by, such as in an airport or casino, may not be effective. If a