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Bosch Security Systems Installation Manual AR18-08-B010 | v1.0 | 2009.03
Glossary
A
AES
Automatic Electronic Shutter (see Electronic iris).
Aperture
The size of the opening in the lens iris that controls the amount
of light reaching the CCD Sensor. The larger the F-number, the
less light reaches the sensor. An increase of one F-stop, halves
the amount of light reaching the sensor.
AutoBlack
A technique of boosting the video signal level to produce a full
amplitude video signal, even when the scene contrast is less
than full range (glare, fog, mist, etc.).
Automatic Gain Control (AGC)
The electronics that regulate the gain or amplification of the
video signal. AGC is used in low-light conditions with the iris
fully open.
AutoIris
The lens iris opening is automatically adjusted to allow the
correct illumination of the camera sensor. With a direct drive
(DC) iris lens, the camera controls the aperture size. A video iris
lens has the control circuit in the lens itself.
Auto Level Control (ALC)
The adjustment of the video level to give the desired brightness
level. This can be done electronically or by means of an iris
control.
Auto White Balance (AWB)
A feature that allows a color camera to automatically adjust its