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Galvanometer:
is a type of auto iris lens in which the DC motor drive is
contained in the camera rather than in the lens. This lens is cheaper
but it cannot be used with cameras which do not have this in built DC
motor drive.
Gamma correction:
is a correction built into the camera to adjust for the
brightness characteristic of the monitor. The gamma value ranges from
0.6 to 1.0
Geometric distortion:
is an error which causes the reproduced picture to be
geometrically different from the original picture.
Graded index cable:
is a type of fibre optics cable which reduces transmission
error by means of a cladding having a graded index of refraction.
Ground loop current:
is an AC current produced in a video cable when the two ends of
the cable do not have the same ground potential.
Ground loop insulator:
is an isolation transformer which can eliminate ground loop
currents by removing any direct connection between the inputs and
outputs.
GUI Graphical User Interface:
interfaces the computer with the matrix switcher. Hot areas on
the computer screen can be programmed to activate a matrix switcher, VCR
etc. It helps in making the CCTV system more user friendly. |