Glossary of CCTV and Surveillance Camera Terms
Analog or analogue signal: A signal which varies continuously, not having discrete values. Television and radio are examples of analogue technologies.
CCD Camera: Digital camera using a Charge Coupled Device (CCD) to form images. Most digital cameras use CCDs.
CCDP: Closed circuit digital photography, use of megapixel digital still cameras that can take images either on a time lapse or motion detection basis.
CCTV: Closed-circuit television, a television system often used for surveillance.
Digital signal: The transmission method for sending voice, data, image or video by translating the information to binary code.
DVR: Digital video recorder, a device that records video in a digital format to a disk drive or other medium.
IR (Infrared): Electromagnetic radiation of a wavelength longer than that of visible light, but shorter than that of microwaves. Infrared radiation has wavelengths between about 750 nm and 1 mm.
(Image of persons in mid-infrared "thermal" light)
Pixel: A pixel (short for picture element) is a single point in a graphic image.
PTZ camera: PTZ stands for Pan, Tilt, and Zoom. These cameras are remotely controlled by software or a joystick, and can be controlled to move left to right, up and down, and zoom in and out. PTZ cameras offer the ability to point the camera’s viewing area to a specific action or event if desired.
VCR: Videocassette recorder, uses removable videotape cassettes containing magnetic tape to record audio and video.
VHS: Video Home System, it is a recording and playing standard developed by Victor Company of Japan, Limited (JVC) and launched in September 1976. By the 1990s, VHS became a standard format for consumer recording and viewing, after competing in a fierce format war with Sony Corporation's Betamax.
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