HOMEINFORMATION
Title   Glossary of Terms CCTV
Date   2010-11-18
Hit   8657

Glossary of Terms Description
(AWB)
Automatic White Balance
The color camera used for surveillance cameras installed in the place usually in the morning and evening hours, depending on the color temperature 1700 (a) K from the 11,000 (a) K are changed to affect the color change of the monitor screen will be worse. To solve this problem, AWB (Auto White Balance) by adding the ability to automatically match the color balance is a natural ability to see the screen.
AGC
(Automatic Gain Control)
An electronic circuit that is used to boost the video signal in a camera in low light conditions.
Use of this feature will usually give a “noisy” or grainy picture. When comparing camera
specifications always use data with AGC off. 
ALC
(Automatic Light Control)
A feature of an Auto Iris lens used to adjust the between peak and average voltage which will emphasise detail in bright areas (peak), or shadows (average).
Angle of View Represents the area of a scene (maximum horizontal and vertical angle) that can be seen through a lens. Measured in degrees.
C-mount Standard lens mounting with a 17.526mm back flange (distance between the lens mount
and the focal point). Normally used on 2/3
and 1 cameras and lenses.
Contrast The difference in intensity between
CS-mount Standard lens mounting with a 12.5mm back flange (the distance between the lens mount
and the focal point) Normally used on modern ¼”, 1/3
, and ½” cameras and lenses.
Day / Night Day & Night feature underground parking and low-light or dark, vivid picture quality in an indoor space is used when you want to automatically detect light by day and IR Cut filter, clear night, IR Cut filter removes the ability to implement quality is.
Day / Night Camera A camera that is 'Day/Night' means it can capture video in both day and nighttime.
In low light conditions, the Sony Day/Night chipset switches from color to black & white at
night to enhance the picture quality 
Dome Camera A common indoor security camera, dome cameras are mounted on the ceiling.  Their two
main advantages are a more appealing visual appearance and being easily movable.  Their
drawback is a lack of usefulness during low light situations (therefore not effective when
the lights are off).
DSP Digital Signal Processing. Refers to an electronic circuit capable of processing digital signals. 
DVR This device transforms analog video signals from security cameras into digital format,
suitable for storage on a hard drive. It also helps the user manage the stored video files,
as well as providing motion detection settings and PTZ security camera control. DVRs can
often be remotely accessed over the Internet. 
Dynamic Range A camera with a wide dynamic range is able to operate in variable light conditions (known
as lux levels), especially those of low light.  A “dB” is usually the unit used to measure the
dynamic range of security cameras, with more being better.  A camera with a 60 dB dynamic
range would be well suited to clearly record a scene in low or high light levels. 
Field of View The height and width of view that can be seen through a lens. 
Fixed Focal Length Lens Lens focal length does not change. In addition to the standard lens telephoto lens activities such as wide-angle lens is.
In general, such as a zoom lens focal length mutable than the imaging resolution is good.
Flange Focal Distance To attach the base of the camera's lens, focal plane distance from the flange. Flanges are also
known as one hundred.
F-Number In lenses with adjustable irises, the maximum iris opening is expressed as a ratio (focal length of the lens)/(maximum diameter of aperture).  This maximum iris will be engraved on the front ring of the lens.
HLC
(HSBLC)
Report scheduled to highlight Backlight HSBLC (Highlight Suppressed BLC) feature a strong light, such as the headlights ability to block effectively, the user desires masked certain areas due to the dazzling lights and license plate recognition is subject to prevent the inhibition.
Horizontal Resolution The number of vertical lines that can be resolved in a picture. 
Image Size If the specifications as the lens has a size of the image, or to use the video camera is the size.
IP Rating Index of protection that refers to the level of protection provided by equipment housings,
against the ingress of dust or moisture. 
Iris Also known as Iris Manual Iris Auto Iris system and method is. In case of Auto Iris camera's video signal or control signal is adjusted by the lens aperture. Side of the camera lens aperture control circuit built-in DC Drive system and built-in lens, Video Drive way is on the side. Auto Iris way to the transition and in the original with the ability to perform manual control is nothing.
Motion Detection These devices are used to detect motion on security cameras.  Simple motion detection
triggers the camera to either record or set an alarm.  Motion detection by frame region
instructs the camera to respond only if a certain area of the screen/frame detects motion. 
Finally, advanced motion detection analyzes the type of motion to see if it warrants alarm
(such as crossing into a secure area).  One benefit of motion detectors is that cameras only
record when motion has been sensed, which saves disk space.
Privacy Image Masking Users are monitored to protect the area can be set off. Location and size of the area, this can be set to sleep.
S/N Ratio Signal-to-Noise ratio is calculated with the logarithm of the normal signal and the noise RMS value. 
Varifocal Lens Varifocal lens is a type of manual zoom lens with a small zoom ratio (ranging between 4mm to 12mm depending on brand). It is used when the focal length of the lens needs to be fine tuned to meet the requirements of the actual scene. 
WDR Users are monitored to protect the area can be set off. Location and size of the area, this can be set to sleep.
Zoom Ratio Zoom in or variable focus lens focal length and maximum ratio between the minimum focal length, you can change the shooting angle indicates the degree levels.