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Back Focus

A term used to illustrate the distance from the lens to the image device. This distance is critical for maintaining the proper depth of field through changing focal lengths and varying light conditions.

Bandpass
Specific range of frequencies allowed passing through a device

Bandwidth
The number of cycles per second (Hertz) expressing the difference between the lower and upper limiting frequencies of a frequency band; also, the width of a band of frequencies.  In effect, bandwidth indicates the amount of information and its complexity which can be carried over a signal.

Batteryrefers to a stored power device.

Battery Run Time indicates the amount of time a piece of electronic equipment can realistically be powered using a particular battery pack.

BLC
Black light compensation. A function that compensates for excessive light directed at the camera which causes the video to bloom or the images in from of the light to be unusable.

Blooming
The defocusing of regions of the picture where the brightness is at an excessive level, due to enlargement of spot size and halation of the fluorescent screen of the cathode-ray picture tube. In a camera, sensor element saturation and excess which causes widening of the spatial representation of a spot light source.

BNC
Bayonet Neil-Concelman or British Naval Connector. A connector widely used in the CCTV industry, usually for coaxial cable.

Bounce
Sudden variations in picture presentation (brightness, size, etc.,) independent of scene illumination.

Bridging
When a high impedance video line is paralleled, usually through a switch, to a source of video.

Brightness
The attribute of visual perception in accordance with which an area appear to emit more of less light. (Luminance is the recommended name for the photo-electric quantity which has also been called brightness.)

Brightness Control
The manual bias control on a cathode ray tube or other display device that controls the average brightness and the contrast of a picture.

Broadband
In television system use, a device having a band-pass greater than the band of a single VHF television channel.

Bps
Bits Per Second is the unit used for measuring line speed, the number of information units transmitted per second.

Biometrics
This is the method of identification of a user based on a physical characteristic, such as a fingerprint, iris, face, voice or handwriting.


 
 
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