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Tech Terms

Terms Descriptions

Auto Gain Control (AGC)

Automatic Gain Control, an electronic circuit that amplifies the video signal when the strength of the signal falls below a given value.

Auto Iris (Optical)

Automatically controls the shuttle speed 0~1/300,000 sec and adjusts the LUX sensitivity by the motor circuit. Which makes the light-receiving hole on a lens larger or smaller according to the amount of light received into the lens. Automatic Iris lenses are generally more efficient than the electric shutter since they actually control the amount of light reaching the sensor as opposed to simply adjusting shutter speed.

Auto White Balance (AWB)

Auto adjustment that makes sure the white color we view directly will also appear white in the image is referred to as white balance.

Back Light Correction (BLC)

A feature of the camera used to help correct an image with more light behind the subject being viewed and the subject appears dark without backlight compensation.


CCD Cameras are much more sensitive to power fluctuations, due to the fact that the CCD Sensors have 4 integrated processors compared to the one processor found on a CMOS sensor. CCD cameras usually have much better picture quality, resolution and color balance.


CMOS?cameras have a less-expensive image sensor than CCD cameras and the other benefits of CMOS are small size and low-power consumption.

Day Visibility

A visible range of camera sees clearly under the normal daylight condition that light intensity level (LUX) is equal or more than the camera specified minimum illumination LUX level.

Electronic Shutter

Controls the shuttle speed 1/60~1/100,000 sec and adjusts the LUX sensitivity by electronically. Recommended to use the cameras has a electronic shutter in the urban area or inside house, but not good for the bright places like beach.
Electronic Light Control (ELC) Compensatesfor moderate light changes in indoor applications without the use of auto iris lenses. Select this mode when a fixed iris lens or manual irislens is used.

Field of View (FOV)

The horizontal or vertical scene size at a given length from the camera to the subject.

The HAD sensor is an abbreviation of the Hole-Accumulation Diode sensor newly developed by Sony. It is a photo sensor consisting of a hole accumulation structure added to an n+P diode.

Infrared Lighting (IR)

Frequency of light, invisible to the human eye, used for covert surveillance and low light camera use.

IR Filter

A filter that filters out the red light to keep the image colors looking natural.


Light emitting diodes, commonly called LEDs, are real unsung heroes in the electronics world. Basically, LEDs are just tiny light bulbs that fit easily into an electrical circuit. But unlike ordinary incandescent bulbs, they don't have a filament that will burn out, and they don't get especially hot. They are illuminated solely by the movement of electrons in a semiconductor material, and they last just as long as a standard transistor.

Invisible 950NM IR-LED
(Shows no sign when LED's on and the emitting IR-light is invisible to human eye)

Visible 850NM IR-LED
(Shows red glow on the tip of LED when it's on, but the emitting IR-light is invisible to human eye and it has a stronger emitting power than the invisible 950NM IR-LED)

White LED
(Shows white glow on the tip of LED when it's on and the emitting is also visible to human eye, but it has a stronger emitting power than the visible 850NM IR-LED)

LUX LUX is a unit measuring the intensity of light and a CCTV camera requires a certain amount of light produced by natural or artificial illumination.

The amount of light is defined by LUX (Lumens per Square Meter) and one LUX is one candle light volume at one-meter distance.

Followings are some examples of natural lights expressed in LUX and these light intensity levels are where the LUX-specified CCTV camera begins to produce decent images.

Full daylight (10,000 LUX) - Very dark day (100 LUX) - Twilight (10 LUX)
Deep twilight (1 LUX) - Full moon (0.1 LUX) - Quarter moon (0.01LUX) - Starlight (0.0003 LUX).
Night Visibility A visible distance in the total darkness only using the built-in lighting source on the camera and longer visible distance can be obtained using other external lighting sources.
Short for Picture Element, a pixel is a single point in a graphic image and the quality of a imaging system largely depends on its resolution, how many pixels it can display.
Signal System
The signal system used in America & Canada is called "NTSC". Western Europe and Australia use a system called "PAL for color & CCIR for B & W", and Eastern Europe and France use "SECAM". Without standards conversion, it is impossible to view a video program that is recorded in a foreign country without first converting it.
Super HAD
Version of Sony's high performance HAD (Hole-Accumulation Diode) sensor with improved sensitivity from the use of more efficient on-chip microlenses that made possible to minimizing lost light and improving the overall sensitivity per pixel.
TV-Lines (TVL) Resolution is measured differently in a video imaging system then in a photographic system. The maximum number of light and dark lines resolved horizontally determines the resolution level of a video system and the higher TVL means the higher video resolution. Each line transition is counted and expressed in TV-Line (TVL) or in Lines of Horizontal Resolution (LoHR) rather than in cycles.