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54 en | Glossary of CCTV Terms AutoDome Modular Camera System
F01U064036 | 1.0 | 2007.01 VG4-200, VG4-300, VG4-500i Series User’s Manual Bosch Security Systems, Inc.
AutoScaling
As the camera zooms in to increase the size of objects on the monitor screen, the pan and tilt
speeds are reduced so that the relative speed on the screen remains constant for similar
joystick control positions.
AutoTrack
A patented technology that integrates motion detection into the camera allowing tracking of
an object and zooming in to optimize size and perspective.
Auto White Balance (AWB)
A feature that allows a color camera to automatically adjust its output color to give a natural
color independent of the lighting used.
B
Back Light Compensation (BLC)
Selectively amplifies parts of the image to compensate for large contrast differences when
only a portion of the image is brightly lit (e.g. a person in a sunlit doorway).
Balun (Balance Unbalanced)
A device that converts a balanced video signal (e.g. as used on twisted pair) line to an
unbalanced signal (e.g. as used on coax). In a balanced line, such as twisted pair, both wires
are electrically equal. In an unbalanced line such as coax, one line has different electrical
properties than the other.
Bilinx
A communications format that allows remote control, configuration and updates to be
performed over the video cable (Coax or Passive UTP).
Biphase
Pan/Tilt/Zoom protocol for Bosch products.
C
Cable Category
Application and bandwidth rating system for UTP cabling. Categories 1 through 6 are based on
EIA/TIA-568-B standards. Category is typically abbreviated CAT. UTP Category 5, 5e, and 6 are
used for Ethernet data cabling applications. Ethernet wiring distances are limited to a
maximum of 100m (328ft.) when using UTP wiring.
Cable Compensation
A technology that prevents image degradation caused by signal losses when transmitting
video over long cable lengths.
CCD Format
Indicates the size of the camera sensor used. In general, the larger the sensor, the more
sensitive the camera and the better the image quality. The format is quoted in inches, for
example 1/4" or 1/3". See Charge Coupled Device (CCD).
CCD (Charge Coupled Device)
The most common type of solid state image sensor used in CCTV cameras. The sensor
converts light energy into electrical signals.
CCTV (Closed Circuit TeleVision)
A video system that transmits television signals over a closed (non-broadcast) system.