CCTV Security Camera News in Da Nang Vietnam

Glossary on CCTV Security Systems



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1080i/ 1080p
1080 is the vertical pixel of a resolution 1920 x 1080; the number of horizontal pixels is implied from context and is often omitted. The lower-case i denotes interlaced and the lower-case p progressive. More info.
802.11
802.11 and 802.11x refers to a family of standards developed by IEEE for wireless LAN technology. Popular standards are 802.11a, 802.11b, 802.11g and 802.11n.
AC Adapter
Alternating Current Adapter; when plugged to AC Power (usually 117VAC/60Hz in the United States) it produces 12VDC, 24VAC or others. “UL Listed” and “Regulated” recommended. It is also called Power Transformer. More info.
AC Power
Alternating Current Power. In the United States, the standard AC Power is single-phase 117VAC/60Hz and is provided from power outlets in the house. 24V AC power can be produced from an AC Adapter.
AGC (Automatic Gain Control)
Automatically adjusts the video quality in low light condition.
Alarm Sensor
Like Video Motion Detector, detects changes of motion to produce an alarm.
ALC (Automatic Light Control)
Allows the auto-iris circuitry to either take bright spots more into consideration (peak), bringing out detail in bright areas, or less into consideration (average) bringing out detail in shadows. Select this mode when an auto-iris lens is used.
Algorithm
A procedure or formula for solving a problem.
Analogue (Analog)
Continuously variable numerical values such as voltage, current, etc.(The CCD camera produces analogue video signals.)
Angle of View
The scene angle that a video camera lens can show on the monitor, like Diagonal Angle, Horizontal Angle and Vertical Angle, usually described in degree. More info.
ANSI
American National Standards Institute. This organization is responsible for approving U.S. standards in many areas, including computers and communications.
Aperture
The light gathering area of a lens, controlled by the iris.
ARP
Address Resolution Protocol; for mapping an IP address to a physical machine address.
ASCII
American (National) Standard Code for Information Interchange. A standard character-to-number encoding widely used in the computer industry.
ASIS
American Society for Industrial Security.
Aspect Ratio
The ratio of the vertical to the horizontal image size; 3:4 is the NTSC standard.
Aspherical Lens
A lens designed with a non spherical shape so that it passes more lights or decreases barrel distortion on wide angle lenses.
Attenuation
A decrease or loss in a signal, usually measured in decibels.
Auto-focus Lens
Automatically adjusts the lens focus from surrounding scene and keeps a moving object in focus.
Automatic Gain Control (AGC)
Automatically adjusts the video quality in low light condition.
Automatic Iris (Auto-iris)
A diaphragm device in the lens that adjusts to light level changes. The iris diaphragm opens or closes the aperture to control the amount of lights coming through the lens.
Automatic Level Control (ALC)
Allows the auto-iris circuitry to either take bright spots more into consideration (peak), bringing out detail in bright areas, or less into consideration (average) bringing out detail in shadows.
Auto Terminating
Automatically select the correct termination depending on whether the video output is connected.
Auto White Balance (AWB)
Automatically adjusts a color camera’s color to maintain white areas.
Bandwidth
The capacity of the transmission medium stated in bits per second or as a frequency. Or, the amount of data that can be transmitted in a fixed amount of time. For digital devices, the bandwidth is usually expressed in bits per second(bps) or bytes per second. For analog devices, the bandwidth is expressed in cycles per second, or Hertz (Hz).
Back Light Compensation (BLC)
Electronically compensates for high background lighting to give detail which would normally be silhouetted.
Baud
A unit of measurement that denotes the number of bits that can be transmitted per second. For example, if a modem is rated at 9600 baud it is capable of transmitting data at a rate of 9600 bits per second.
Bifocal Lens
A lens system that has two different focal length lenses and images two identical or different scenes onto a single camera sensor. The two captured scenes appear as a split image on the monitor.
Binary
A numbering system with only two values: 0 (zero) and 1 (one).
Bit
Abbreviated with small “b”. Binary Digit. The smallest unit of data in a computer.
Blanking
The process whereby the beam in a CRT is cut off during the retrace period.
BLC (Back Light Compensation)
Electronically compensates for high background lighting to give detail that would normally be silhouetted.
BNC
Bayonet Neil-Concelman or British Naval Connector. A connector widely used in the CCTV industry, usually for coaxial cable. Easy to install and reliable with little video signal loss. Pictures of BNC Connectors
bps
Bits Per Second is the unit used for measuring line speed, the number of information units transmitted per second.
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.
Browser
An application program that provides a way to look at and interact with all the information on the World Wide Web. Netscape and Microsoft Internet Explorer are the two browsers that vast majority uses.
Bus
When referring to a computer, the bus is a data connection between two or more devices, such as memory, video card, and scanner.
Byte
Abbreviated with capital “B”. A unit of data that is eight bits long and is used by most computers to represent a character such as a letter, number or symbol.
C-Mount
An industry standard for lens mounting. C-Mount is 1-inch diameter with 32 threads per inch. A C-Mount lens needs C-ring when it is mounted at a CS-Mount camera. More info.
C-MOS
Complementary – Metal Oxide Semiconductor. A video image sensor chip that produces much lower quality picture than CCD chip.
Camera Format
Video camera’s CCD chips format; 2/3″, 1/3″, 1/4″, etc.
Camera Sensor
Video image sensor. CCD or C-MOS chip. More info.
CATV
Cable Access Television.
CCD
Charge Coupled Device. A video image sensor chip. More info.
CCIR
Stands for French “International Radio Consultative Committee”; This recommended the standards for B/W television accepted by most of Europe, Australia, New Zealand, most of Africa and Asia. The same “type” of standard, but later extended to colour signals, was called PAL.
CCTMA
Closed Circuit Television Manufacturers Association.
CCTV
Closed Circuit Television. It does not broadcast TV signals but transmits them over a closed circuit through electrically conducting cable or wireless transmitter and receiver. More info.
CCTV Camera
A part of the CCTV system that captures the video pictures.
CCTV Monitor
A part of the CCTV system that receives the video pictures from a CCTV camera and displays them. More info.
Coaxial Cable
A cable that can carry a wide range of frequencies with very low signal loss. It consists of a metallic shield with a single wire placed along the center of a shield and isolated from the shield by an insulator. More info.
Color Saturation
The degree of mixture of a color and white. High saturation means little or no white.
Component Video
A type of video information that is transmitted or stored as two or more separate signals. Opposed to composite video.
Composite Video
A combined signal in a television transmission. Standard format such as NTSC, PAL or SECAM. The picture signal, blanking signal, and vertical/horizontal synchronizing signals are all combined.
CRT
Cathode Ray Tube. The vacuum tube part of a monitor or television.
CS-Mount
An industry standard for lens mounting. CS-Mount is 1 inch diameter with 32 threads per inch. A C-Mount lens needs C-ring when it is mounted at a CS-Mount camera. More info.
Date/Time Generator
Installed between a CCTV camera and a monitor, it generates the information of Date, Time and camera ID.
DC Power
Direct Current Power; can be derived from an AC adapter or from a battery. Among DC voltages of 6, 9, 12, 24, 28, 12VDC is most common in the CCTV industry. More info.
Decibel (dB)
The power or voltage ratio of two signals.
DFP
Digital Flat Panel, one of digital video connectors.
DIP switches
Dual Interface Poll switches usually allow you to change the configuration of a circuit board to suit your application.
DMZ
Detection of Motion Zone
DHCP
Dynamic Host Configuration Protocol; lets network administrators manage centrally and automate the assignment of IP addresses in an organization’s network.
DIN
Multi-wire cable with DIN connectors at both ends. Usually has 5 or 6 inner wires. Different diameter and configuration from maker to maker. Pictures of DIN connectors or, more details about DIN Cable…
Distortion
A general term when the object is not shown exactly as is.
DNS
1)Domain Name System. A general purpose distributed, replicated, data query service. Its principal use is the lookup of host IP addresses based on host names. 2)Domain Name Server. A computer that converts host names, such as www.pelikancam.com to its corresponding IP Address, such as 67.100.253.111
DRAM
Dynamic Random Access Memory. Most common RAM (Random Access Memory) for PC.
DSL
Digital Subscriber Line. A technology for bringing higher-bandwidth information to homes and businesses over ordinary copper telephone lines. More info.
DVI
Digital Video Interface, one of digital video connectors.
DVR
Digital Video Recorder; records video pictures digitally. More info.
Dwell Time
The length of time a switcher displays one camera before sequencing to the next.
EIA
Stands for Electronics Industry Association, an association that created the standard for B/W television in the USA, Canada and Japan.
ELC (Electronic Light Control)
Compensates for moderate light changes in indoor applications without the use of auto iris lenses. Select this mode when a fixed iris lens or manual iris lens is used.
Electronic Shutter
Compensates for moderate light changes in indoor applications without the use of auto iris lenses.
EMI
Electro-Magnetic Interference.
Ethernet
The most widely installed Local Area Network (LAN) technology. Specified in a standard IEEE802.3.10/100 BASE-T, the most commonly installed Ethernet system, provides transmission speed up to 100 megabits per second.
EVC
Enhanced Video Connector, one of digital video connectors.
Extranet
A private network. It uses the Internet Protocol to securely share part of a business information with suppliers, vendors or others
FCC
Federal Communications Commission; controls also wireless camera system as one of the commercial broadcasting systems.
FFL
Fixed Focal Length Lens
Fiber-Optic Cable
One of the video transmission ways, being used for a long distance transmission up to miles. More info.
Field
One video frame is composed of two fields; one field consists of the odd numbered lines in the frame and the other field consists of the even numbered lines.
Field Frequency
The number of fields per second.
Field Of View
FOV. The width, height or diameter of a scene to be monitored. Usually determined by the focal length of a lens, the sensor format and the distance to the objects. More info.
Firewall
A set of programs that protects the resources of a private network from outside users.
FL
Focal Length. The distance from the center of a lens (or, the secondary principal point, if it has) to the focal point (sensor). The longer the focal length, the narrower is the angle of view. More info.
Flange-back Adjusting Ring
Some models of CCTV cameras have built-in Flange-back Adjusting Ring, which adjusts the back-focal distance or picture focus. A C-Ring (5mm spacer ring) is not required when a C-Mount lens is to be mounted to a camera that has built-in Flange-back Adjusting Ring.
Flash Memory
Or flash RAM (Random Access Memory). A type of constantly powered nonvolatile memory that can be erased and reprogrammed in units of memory called blocks.
f-number (f-stop)
Optical or lens speed. Smaller f-number means faster lens. More info.
Focal Length
FL. The distance from the center of a lens (or, the secondary principal point, if it has) to the focal point (sensor). The longer the focal length, the narrower is the angle of view. More info.
FOV
Field of View. The width, height or diameter of a scene to be monitored. Usually determined by the focal length of a lens, the sensor format and the distance to the objects. More info.
Frame
A whole video image; is composed of two interlaced fields. A CCD chip produces 30 frames per second at NTSC system and 25 frames at PAL.
Frame Frequency
The number of frames per second. The frame frequency is half the field frequency.
FTP
File Transfer Protocol. A way to exchange files between computers on the Internet
Gamma
Degree of contrast in a video picture between output magnitude and input magnitude.
GB
Gigabyte.
Genlock
A device that adjusts the frequency of internal sync to an external data.
Ghost
A shadowy or weak image in the received picture, offset to either the right or to the left of the primary image.
HDMI
High Definition Multimedia Interface, one of HD video connectors. More info.
HDTV
High-Definition Television (HDTV) is a digital television broadcasting system with higher resolution than traditional television systems (standard-definition TV, or SDTV). More info.
HTML
Hyper Text Markup Language. A set of codes inserted in a file intended for display on a World Wide Web browser page.
HUB
As a network product, a hub may include a group of modem cards for dial-in users, a gateway card for connections to a Local Area Network (LAN), and a connection to a line.
Hz (Hertz)
Cycles per second.
ICMP
Internet Control Message Protocol. A message control and error-reporting protocol.
IEEE (Institute of Electrical and Electronics Engineers, Inc.)
A non-profit organization, IEEE is the world’s leading professional association for the advancement of technology.
Impedance
Electrical characteristic of a system or component, expressed in ohms. CCTV industry has standardized 75-ohm impedance.
Infrared (IR) Light
Invisible light beyond the 750 nanometers(red end of the visible lights).
INT
Internal sync mode that sets to internal 2:1 interlace.
Intranet
A private network. It may consist of many LAN and/or WAN.
IP
Internet Protocol. A set of rules to send and receive messages at the Internet address level. More info.
Iris
An adjustable opto-mechanical aperture built into a camera that controls the amount of lights coming through the lens.
ISDN
Integrated Service Digital Network. A set of standard for digital transmission over ordinary telephone copper wire.
JPEG
Joint Photographic Experts Group. A graphic image file or a image compression algorithm. More info.
KB
Kilobyte
Kbps
Kilobits per second. A measure of bandwidth.
LAN
Local Area Network. A group of computers and associated devices that share a common communications line. More info.
LED
Light Emitting Diode.
Lens Mount
The area where a lens is mounted. There are two types; C- or CS-Mount. More info.
Lens Speed
Optical speed, expressed by f-number. Smaller f-number means faster lens. More info.
Linux
An UNIX-like operating system. Very efficient and fast-performing system.
LL
Line Lock mode
LNB (Low Noise Block Converter)
The part of satellite dish that hangs off of the arm and looks like a flashlight. It is what captures the digital signal from the satellite.
Lux
Lumens per Square Meter; unit of illumination amount. More info.
MATV
Multiple Access Television. The method of distributing TV signals by broadcasting them through the air.
MB
Megabyte
Mbps
Megabits per second. A measure of bandwidth.
Mini-DIN
Multi-wire cable with Mini-DIN connectors at both ends. Usually has 4 inner wires. Pictures of Mini-DIN connectors
Monochrome Signal
Black and White signal.
MOD (Minimum Object Distance)
The closest distance a lens will be able to focus upon an object. Wider angle (shorter focal length) lenses generally have a smaller MOD than larger focal length (narrower angle) lenses.
MOS
Metal-oxide Semiconductor. One of video image chips like CCD, but it produces lower quality video.
Motorized Lens
A camera lens equipped with small electric motor that enables focusing lens, opening or closing the iris diaphragm, or changing the focal length.
MPEG
Moving Picture Experts Group. A standard for a digital video & audio compression. More info.
Multiplexer (MUX)
Combines two or more video/audio signals into one channel. Usually accepts 10 or 16 video inputs and displays them in various formats.
Network
A series of points or connection points interconnected by communication paths. More info.
Noise
Undesired signals that corrupt the original video signals and may reduce the image quality.
NTSC
National Television System Committee; formulates standards for American color television system. NTSC system has 525 horizontal scan lines and 30 frames per second.
NVR
Network Video Recorder. A software or computer that records video on the hard disk. Like a DVR, it usually records digitally so the user can instantly search by time, date and camera. It collects video from network camera, network video server or DVR over the network.
Optical Speed
Lens speed, expressed by f-number. Smaller f-number means faster lens. More info.
Optical Axis
Optical centerline that passes through the center of a lens or mirror, etc.
PAL
Phase Alternating Line system. A color television system used in Europe, Australia, parts of Africa and the Middle East. It has 625 horizontal scan lines and 25 frames per second.
Pan and Tilt
A Camera mounting device that allows movement in both side ways and up or down.
Pan
Rotating or scanning a camera side ways to view an area in a horizontal direction.
Peak-To-Peak
The amplitude difference between the most positive and the most negative excursions of a signal.
Picture Element (Pixel)
Photo sensor site in an image sensor like CCD chip; converts the input light image to an electronic signal.
Pinhole Lens
A lens with a relatively small front opening so it can be used in covert application.
Pixel
Picture Element. Photo sensor site in a image sensor like CCD chip; converts the input light image to an electronic signal.
PoE (Power over Ethernet)
A technology for wired Ethernet LANs that allows the electrical current.
PPP
Point-to-Point Protocol. For communications between two computers using a serial interface.
PPPoE
Point-to-Point Protocol over Ethernet.
Presets
The pre-positioning of pan, tilt and zoom cameras by the use of potentiometers in the moving parts of the camera head. These allow the control equipment to store and move to a set reference point when the controller dictates or when an alarm exists.
Progressive scanning
is a method for displaying, storing or transmitting moving images in which all the lines of each frame are drawn in sequence. This is in contrast to the interlacing used in traditional CRT television systems. Progressive video is designed for display on LCD, Plasma, DLP and LCoS monitors.
Protocol
A special set of rules (in information technology).
PSTN
Public Switched Telephone Network.
Quad Splitter
Combines up to 4 video inputs into one channel and displays them on one monitor screen split into 4. More info.
RAM
Random Access Memory. The place in a computer where the operating system, application programs, and data in current use are kept temporarily so that they can be quickly reached by the computer’s processor.
RARP
Reverse Address Resolution Protocol. For host machines that don’t know their IP address.
RCA
The Radio Corporation of America; conveniently used to describe phono jack and plug, one of the audio/video connectors. Pictures of RCA Connectors
Resolution
Expressed by TV lines or pixels, it indicates the quality level of video images.
RF
Radio Frequency.
RG# Cable
RG stands for Radio Guide (meaningless anymore). The most common RG designations are RG-6, RG-8, RG-11, RG-58 and RG-59. More info.
RoHS (Restriction of Hazardous Substances)
This directive restricts the use of six hazardous materials in the manufacture of various types of electronic and electrical equipment. The six materials are Lead, Mercury, Cadmium, Hexavalent chromium, Polybrominated biphenyls (PBB), and Polybrominated diphenyl ether (PBDE).
Router
A device on the Internet that determines the next network point to which a data should be forwarded.
RS-232 Port
A communication port with 15 pins.
SDI
Serial Digital Interface (SDI) refers to a family of video interfaces standardized by SMPTE. More info.
SDTV
Standard-definition TV: traditional television.
SECAM
Comes from the French “Sequentiel a memoire” which actually describes how the colour is transmitted, by a sequence of chrominance colour signals and the need for a memory device in the TV receiver when decoding the colour information. This is used in France, Russia and some other Eastern European countries. It has 625 horizontal scan lines and 25 frames per second.
Sequential Switcher
Video Switcher. A device that allows the video signals from multiple cameras to be displayed on a monitor, or recorded on a VCR one at a time in sequence. More info.
Server
A computer program that provides services to other computer programs in the same or other computers. Or, the computer that a server program runs.
Signal-to-Noise(S/N) Ratio
The ratio between the television signal and the noise; expressed in decibel(dB). The higher the number the better.
SMPTE
The Society of Motion Picture and Television Engineers (SMPTE) is an international professional association, based in the United States of America, of engineers working in the motion imaging industries. More info.
SMTP
Simple Mail Transfer Protocol. TCP/IP used in sending and receiving e-mail.
Switcher
Sequential Switcher or Video Switcher. A device that allows the video signals from multiple cameras to be displayed on a monitor, or recorded on a VCR one at a time in sequence. More info.
SVHS (Super Video Home System)
Super VHS; a higher quality extension of the VHS home videotape format.
S-Video
Transmits luminance and color portions separately, using multiple wires, thus avoiding the color encoding process and its inevitable loss of picture quality.
TCP
Transmission Control Protocol. A set of rules to exchange messages with other Internet points at the information packet level.
TCP/IP
Transmission Control Protocol / Internet Protocol. The basic communication language or protocol of the Internet.
TFT
Thin Film Transistor, a type of LCD flat-panel display screen. The TFT technology provides the best resolution of all the flat-panel techniques, but it is also the most expensive. TFT screens are sometimes called active-matrix LCDs.
Time/Date Generator
Installed between a CCTV camera and a monitor, it generates the information of Date, Time and camera ID.
Time Lapse VCR
A video recorder that can be set to record continuously over long period of time. This can be anything from two hours to 960 hours. More info.
VESA
Video Electronics Standards Association. VESA has issued a number of standards, mostly relating to the function of video peripherals in PC computers.
VHS
Victor Home System; used by most VCRs as the recording medium.
Video Band
The frequency band used to transmit a composite video signal.
Videocassette Recorder (VCR)
A device that accepts signals from a video camera/microphone and records video/audio on magnetic tape in a cassette. The VCR can play back recorded video/audio on a television set or CCTV monitor.
Video Switcher
Switcher or Sequential Switcher. A device that allows the video signals from multiple cameras to be displayed on a monitor, or recorded on a VCR one at a time in sequence. More info.
WAN
Wide Area Network.
Wavelet
A mathematical function useful in digital signal processing and image compression. In the Internet communications, wavelet has been used to compress images to a greater extent than is generally possible with other methods such as JPEG or MPEG. More info.
Web Camera (or Web Camera Server)
A CCTV Camera with built-in web server computer. More info.
Web Server
The computer program (housed in a computer) that serves requested HTML pages or files.
Zoom Lens
A lens of continuously variable focal length.