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Appendix-D
CCTV References:
Chroma: That quality of color which embraces both hue (Corresponds to colors such as red, blue,
etcetera) and saturation. White, black, and grays have no chroma.. Increasing the chroma level
will brighten up certain colors on the camera picture.
Color Temp: The white light is made up of all wavelengths in the visible spectrum. True white light has an
equal intensity at every wavelength. If any wavelength has a higher intensity than the rest, the
light takes on a hue related to the dominant wavelength. A simple definition of the hue cast of
white light is called “Color Temperature”. The one standard white lighting in photography
and photomicrography is 5000°K (D50) and is called daylight neutral white.
dB: Basically, a measure of the power ratio of two signals. In system use, a measure of the voltage
ratio of two signals, provided they are measured across a common impedance.
Dynamic Range: The difference between the maximum acceptable signal level and the minimum acceptable
signal level. Wide dynamic range enables the camera to adjust to a variety of lighting
conditions in an efficient manner.
Gamma: A numerical value, or the degree of contrast in a television picture, which is the exponent of
that power law which is used to approximate the curve of output magnitude versus input
magnitude over the region of interest. Gamma level can be manipulated to make the picture
more human eye perceptible.
Iris: An adjustable aperture built into a camera lens to permit control of the amount of light passing
through the lens.
Line Lock: Refers to multiple cameras being powered by a common AC (alternative current) source and
consequently have field frequencies locked to their same AC source frequency.
Lux: International System (Sl) unit of illumination in which the meter is the unit of length.
Resolution (horizontal): The amount of resolvable detail in the horizontal direction in a picture. It is usually
expressed as the number of distinct vertical lines, alternately black and white, which can be
seen in a distance equal to picture height.
Resolution (vertical): The amount of resolvable detail in the vertical direction in a picture. It is usually
expressed as the number of distinct horizontal lines, alternately black and white, which can
theoretically be seen in a picture.
S/N Ratio: The Signal-to-Noise ratio between useful television signal and disturbing noise or show