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Glossary - G

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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.

 

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