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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. |
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