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Car Camera
Pen Spy Camera with built-in DVR
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USB 4-Channel DVRs
Budget Standalone 4 Channel DVR
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Standalone 4 Ch Full Spec DVR
Standalone 9 Channel DVR
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Standalone 16 Ch High Comp DVR
Camera Accessories
Video Baluns
Infrared Lamps
Camera Brackets & Housings
Basic Mounting Bracket
Outdoor Camera Housing
Camera Lenses
Basic Camera Lenses
Manual Iris Lenses
Auto Iris Lenses
Car Reversing System
Wireless Car Reversing System

We accept:

Glossary - G

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Gamma: Gamma is a correction of linear response of a camera. This is to compensate for the monitor phosphor screen non-linear response. This is measured with the exponential value of the curve describing the non-linearity. The typical Gamma for a monochrome monitor is 2.2, and the camera needs to be set to 0.45(which is the inverse of 2.2) in order for the overall system to be linear.
Gen-Lock: A way of locking the video signal of a camera to an external generator of synchronisation pulses (hence gen-lock)
GND: Ground (electrical)
Ground loop: An unwanted interference in the copper electrical signal transmissions with shielded cable, which is a result of ground currents when the system has more than one ground. For example, in CCTV, when we have a different earthing resistance at the camera, and the switcher or monitor end. The induced electrical noise generated by the surrounding electrical equipment(including mains) does not discharge equally through the two earthings(since they are different) and the induced noise shows up on the monitors as interference.
GUI: An abbreviation for Graphical User Interface, a computer term, which is becoming more and more popular in the Security Industry as the systems become more user friendly.

Copyright (c) 2004-2007 (Colourstory Pty Ltd T/a Footprint Security ABN 84 122 563 651)
PO Box 10662, Southport BC, Queensland 4215, Australia

Phone: 1300 852 400 (Local call Australia wide)