Bosch 100 Series Справочное руководство - Страница 42
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Glossary of CCTV camera terms
"C" and "CS" Mount
Standard CCTV lens mount. "CS"
mounts normally used and have a flange
to sensor distance of 12.5mm. Older "C"
mount lenses, normally for larger format
sensors, can still be found with a flange
distance of 17.5 mm. Camera back focus
adjustment needs to be able to handle
either type.
Charged Coupled Device (CCD)
The most common type of solid state
image sensor used in CCTV cameras.
The sensor converts light energy to
electrical signals.
Coaxial Cable
The type of cable generally used for TV
signals where one conductor is arranged
around the other to provided a shield,
and reduce signal loss.
Composite Video
A video signal that combines the picture
signal, synchronizing pulses and vertical
and horizontal blanking.
Crosstalk
An unwanted signal from different cable
or channel that interferes with the video
signal.
Day/Night (IR sensitive)
Color cameras have a built in infrared
filter to improve color reproduction.
In low light situations in a Day/Night
camera the IR-cut filter in front of the
42
color sensor is removed restoring
the IR sensitivity of the camera.
DC Iris Lens
See Auto Iris Lens.
Depth of Field
The distance from the nearest to
furthest point which appears in focus.
The smaller the aperture used the
greater the depth of field.
Dynamic Noise Reduction (DNR)
Digital Video processing that measures
the noise in the picture and
automatically reduces it appropriately.
Electronic Iris
EI automatically adjusts the camera's
shutter speed to account for lighting
changes. In some cases eliminating the
need for an auto iris lens. Sometimes
referred to as AES.
F-Number
The standard measure of the Lens
aperture, the iris diameter divided by
the focal length of the lens. The lower
the maximum aperture, the more light
that passes through the lens, also
known as a faster lens.
F-Stop
See F-Number.
Focal Length
The distance from the optical center of
the lens to the image of an object located
at an infinite distance from the lens.