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Om CCTV

Ord & Uttrykk	Forklaring	Bilde
AC adapter	Også kjent som strømforsyning. Alle CCTV produkter trenger strøm fra en strøm kilde. Hvert produkt trenger forskjellig spenning og strøm styrke (12V 500mA er det vanligste.). Strømmen som kommer ut av Norske kontakter er AC 220V adapteret omgjør dette til DC med ønsket strøm og spenning, DC spenning har også + og - å forholde seg til. Adapter følger som regel med produktet.
Alarm input	En inngang for VCR eller DVR som starter opptak/Recording ved aktivering. (Bevegelse, brytere, følere.)
Analog	Det er 2 signal muligheter innen elektronikk, analog og digital. - Ett analog signal er basert på spennings svingninger i signalet. - Digitale av 0 og 1.
Analog system	Nesten alle kamera som blir brukt til CCTV er analoge kamera. Sikkerhets VCRs, switchers, multiplexere og quad er også analoge produkter. Noen produkter som DVR opptakere og Multiplexere konventerer signalet fra analog til digital for komprimering, behandling og lagring
Angle of view	For overvåkings kamera, betyr dette vinkelen kameraet filmer.
Aperture	Dette angir opningen av lys som slipper forbi linsen.Størrelsen på "Aperture" er kontrollert av irisen justeringen. Ved å øke "f" stop nummeret (f1.4, f1.8, f2.8, o.s.v.) dess mindre lys slipper inn i kameraet.
Armor dome camera	Dette er kamera som er laget i slag fast materielle, og som tåler det meste av slag og hærverk.
Audio	De fleste proff CCTV kamera har kun "video bilde" som gir bilder ikke lyd - noen mindre hobby kamera kommer også med lyd (sound).
Auto electronic shutter	Funksjonen som gjør det mulig for kameraet å justere seg inn etter små lys forandringer i innendørs omgivelser, uten bruk av auto iris linse.
Auto iris control	En auto iris linse er en linse som automatisk justerer linse åpningen basert på styrken av den ankommende lys kilden. Om ditt sikkerhets kamera er installert i et kontor, trenger du sannsynligvis ikke en auto iris linse fordi denne lys kilden er stabil. Om kamera er installert utendørs, er det kanskje en fordel med en auto iris linse fordi denne lys kilden forandrer seg gjennom dag. Hvis du ikke har ett night vision kamera(IR).
Auto gain control	En elektronisk krets som justerer seg automatisk etter signal styrke. Innebygget i de fleste kamera.
Auto white balance	En funksjon på farge kamera som automatisk justerer lys og farge på hvite områder i bildet.
Back light compensation	En funksjon som automatisk justerer sterkt baklys for å få frem detaljer i bildet, som ellers ville sett helt hvit ut.
Bullet camera	Et kamera som er kule formet og kan brukes inne og ute, også perfekte til extreme sport. Kan også fåes med IR lys for bruk i mørke forhold.
C-mount camera	C-Mount kamera er en type kamera som har utskiftbare linser. Linsene kan skiftest ut etter behov.
Cable	The wiring used to connect electronic devices. Cables tranmit different kinds of signals such as video, power, data, and audio signals. Refer to plug and play cable and RG59 siamese cable for more information.
CMOS	CMOS-brikken utfører flere oppgaver enn CCD-sensoren. . Den kan bli programmert til å konvertere elektriske ladninger (analoge) til digitale data samt utføre bildeprossessering. Dette gjør at kamera kan bygges mindre enn kamera med CCD. CMOS bruker mindre strøm, og produserer lav elektrisk støy. De er billigere å produsere. Men alle disse ekstrafunksjonene er med på å produsere mer støy pga motstand og interferens. CCD sensoren dominerer markedet, mens CMOS gjerne blir brukt i billigere kamera. Nyere teknologi har imidlertid økt ytelsen på CMOS betraktelig ved å utnytte CMOS-sensorens egenskaper maksimalt. F.eks. har man på Canon sin nye profesjonelle EOS-1Ds brukt en CMOS-sensor som viser seg å ha imponerende egenskaper.
CCD	Står for "charge-coupled device". Først oppfunnet i 1970 årene, brukes i kamera, digital kamera, osv. CCD bilde sensor er mer lysfølsom og gir betre bilder en CMOS sensor som er et billigere alternativ. CCD er den mest populære brikken for digitale kamera, og blir generelt betraktet som den brikken som har høyst bildekvalitet. CCD en konverterer ganske enkelt lys om til elektriske ladninger, og sender disse ladningene til en annen del av kamera som prossesserer data. Dette minimaliserer støy og øker bildekvaliteten.
CCTV	Står for "Closed-circuit television".
Compression	Refers to taking an incoming signal or image, which can be analog or digital, and compressing the data so it can be stored or transmitted faster and using less resources. There are many different algorithms and techniques that are used to compress data.
Covert/Skjult	A covert application refers to a situation where you dont want the person to know that they are being watched or recorded. Also known as "hidden" cameras.
Day / night camera	"Day/Night Cameras" are regular cameras with an especially sensitive CCD chip that allows a good image to be captured in very low ambient lighting (regular lighting - not infrared). Do not confuse these cameras with "Night Vision" cameras which is another name for infrared cameras.
Digital	There are two main ways of doing things electronically, analog or digital. The digital method is to consider a circuit either on or off. A digital voltage or signal refers to the discrete nature of digital voltage potentials in digital circuits. TTL (Bipolar Transistor-Transistor Logic) defines 0.0 Volts as a logic 0 or low, and 5.0 Volts as a logic 1 or high; These are single values for clarity - there are actually ranges of voltage potentials around 0.0V and 5.0V which are recognized as low and high logic levels, respectively.
Digital system	CCTV systems are just lately coming into the digital age. Most security cameras are still analog. There are some digital cameras available but they are extremely expensive. Where digital technology is really making ground in CCTV is with digital video recorders (or DVRs). Any CCTV system that includes a DVR is considered a digital system.
Digital video recorder (dvr)	A digital video recorder is basically a computer that converts the incoming (analog) signal from the cameras to digital, and compresses it, and stores it. The DVR replaces the function of a multiplexor (or quad or switcher) and a security VCR. There are many advantages of digital video recorders over their analog counterparts.
Dome camera	A type of camera with a dome like shape. Usually used inside only. Some come with infrared lighting and some are designed to be tamper-proof.
Duplex	A duplex device can transmit data into and out of the electronic device at the same time. For example, a full duplex digital video recorder can continue capturing and recording images even while a different image is being displayed.
Frames per second (fps)	In digital video applications, refers to the number of video images that can be captured, displayed, or recorded in a second. Also referred to as the "frame rate" or "refresh rate".
Housing	Special covering or container to protect a camera from extreme temperatures or weather conditions.
Infrared	The region of the electromagnetic spectrum bounded by the long-wavelength extreme of the visible spectrum (approximately 0.7 m) and the shortest microwaves (approximately 0.1 mm).
Infrared camera	Night Vision er en innretning som sender ut usynlig infrarødt lys, for å kompensere det vanlige lyset kamera får. Vanligvis er det lys kravet for B/W kamera meget lavt. Et lys som komme fra en svak lyspære eller en korridorlampe er allerede tilstrekkelig. Om du tar video fra en plassering, hvor lyset er meget svakt eller ingen lys i det hele tatt, det er da du installerer et kamera med innebygde infrarøde lys. Om ett farge kamera blir brukt under lave lyse forhold (selv med infrarød natt innretning installert), får du videoen i svart/hvit. Men fungerer nesten like bra som ett svart/hvit kamera når begge er med IR. Fordelen med farge er mest på dagtid, men fungerer utmerket på nettene med ir kamera Ved hjelp av infrarødt(IR) lys arbeider kamera med 0 LUX, dvs., under totalt mørke, selv bedre enn de menneskelige øynene!
Iris	The iris (on some lenses) controls how much light is let into the camera lens.
jpeg (or jpg)	Pronounced "jay-peg" and stands for "Joint Photographic Experts Group" who designed the standard. This is a standard way of compressing images which works particularily well for photographic images (as opposed to graphic art).
Lens	The lens of the camera determines the angle of view and the focus of the captured image. There are many different lens options.
Low light	Refers to very dim lighting, even "normal" darkness. Complete darkness is 0 lux. Infrared cameras work well in very low light conditions.
Lux	Illuminasjonsfaktoren LUX (1/10 av et fotlys) er en standardisert måleenhet for kameraets sensitivitet til lys. Jo mindre tallet er, det mindre lys trenger det for reproduserer et klart avbilde. Et kamera med 1 LUX, betyr at det klarer å avbilde fra f.eks tidlig i morgens timene eller akkurat i skumringen. Et fotoapparat med 0.5 LUX har evnen til å avbilde i en svakt opplyst område. En 40W lysstoffpære gir tilstrekkelig innendørs lys for et kamera med 2 LUX. Ved hjelp av infrarødt(IR) lys arbeider kamera med 0 LUX, dvs., under totalt mørke, selv bedre enn de menneskelige øynene!
Micro camera	Very small cameras designed to work in covert applications where you dont want people to know that the camera is there. Also called "hidden cameras".
Monitor	Security monitors are used to display the images from your cameras (or captured on your recording device). There are two basic kinds used today in CCTV applications. Analog or composite video monitors are used to display images in analog systems. They are just like a TV screen without the TV receiver. These are the monitors we have for sale on our site. Digital or VGA monitors (just like on your computer) are used with digital devices like the Digital Video Recorders. We dont include the monitor with our digital video recorders because you can pick one up more affordably at your local computer store (and not have to pay the shipping cost for such a heavy item).
Motion detection	Refers to the feature in some VCRs and DVRs to only record video if something in the image moves or changes. Therefore you dont have to look through hours of taped video looking for something to happen. It also saves a lot of space on the tape or hard drive.
Mounting bracket	Various different kinds of mounting brackets are used to install cameras to the wall or ceiling.
mpeg (or mpg)	Pronounced "em-peg" and stands for "Motion Picture Experts Group" who designed the standard. This is a standard way of compressing audio and video files. (Its also the technology behind the now world-famous MP3 music files.)
Multiplexor	A device that can accept a number of camera inputs and almost simultaneously display them on a single monitor and/or record them. Multixplexers can also be used to transmit multiple cameras over the same transmission medium.
Outdoor camera	Outdoor cameras come in special weatherproof housings that allow them to stand up well in tough weather and temperature conditions.
Pan-tilt-zoom (PTZ) cameras	PTZ cameras allow you to adjust the position ("pan" is side-to-side, "tilt" is up-and-down) and focus ("zoom") of the camera using a remote controller. Due to this added functionality, these cameras tend to cost much more than non-PTZ cameras
Pin-hole camera	Pin-hole cameras have a very small lens that can see through a small hole. These types of cameras are used in covert applications. A disadvantage of pin-hole cameras is that they require more lighting than normal cameras to capture a good clear picture.
Plug and play cable	A cable that makes wiring cameras easy. Each camera needs to have a power wire and video wire (and sometimes an audio wire too), plus the connectors at the end of the wire to plug it in. The plug and play cables have all three wires built into one cable with the connectors already attached. The only disadvantage of plug and play cable is that the signal tends to degrade if run distances. For DVRs - plug and play cables can be run reliably up to 100 ft. For analog systems - plug and play cable can be run up to 400 ft. If you need to run longer distances then you need to use the RG59 siamese cable.
Power supply	Also called an AC adaptor. All cctv devices needs power of some sort. Each device has its own power requirements (usually 12 volts with a minimum amperage). The power coming out of the wall (in the US) is 110 to 120 AC. The power supply converts the AC power to DC power and will adjust it to a specified amperage. The power supply should be included with each item - you dont have to buy these separately.
Quad	An analog device used to display 4 cameras simultaneously on a single monitor.
RG59 siamese cable	This type of cable combines the power wire with the video wire. You have to add your own connectors to each end of the cable. Use this type of cable when you need to run distances longer than 100 ft with a digital system, or more than 400 ft. with an analog system (see the plug and play cable above). The RG59 siamese cable can be run reliably up to 1000 ft.
real-time recording	In digital video applications, 25 frames per second per camera (see above) looks just like real-time. There is no hesitation or jerkiness in the video.
remote surveillance	The ability to view your cameras from a remote location. Information is transmitted via phone line or internet.
Resolution	Resolusjon er en målenhet av kameraets klarhet. Kamera resolusjon er sammensatt av antallet horisontal videolinjer (jo høyre jo bedre) ett kamera trenger for å reprodusere det ønskede bildet. Jo høyere resolusjonsantallet, desto skarpere blir bilde. De kamera som vi selger har fra 380 linjer og oppover til 600 linjer.
Smart Search	This is a feature of our digital video recorders that allows you to search for changes in a particular area of an image over time. For example, if a wallet was stolen off of a table, you could go to a point on the video where the wallet is there, draw a virtual box around that area, then search the video recording for changes to that particular area. This would allow you to locate the exact point on the video where the wallet was removed.
s/n ration	signal to noise ratio; this number represents how much signal noise the camera can tolerate and still provide a good picture. The higher the number the better.
Switch	A switch will take multiple camera inputs and will show them on the monitor one at a time. Unlike a quad it will not display them all at once, instead it sequences through them showing one camera at a time. It will also allow you to select a particular camera to view.
Time-lapse VCR	A VCR that can be set to slow down its recording rate in order to extend the length of time that can be recorded on a standard tape up to as much as 960 hours. This is possible by recording one frame at time at set time intervals. Most units have an alarm input signal so it can be automatically switched to real time mode in case of an alarm.
Transformer	A device used to transfer electric energy from one circuit to another, especially a pair of multiply wound, inductively coupled wire coils that effect such a transfer with a change in voltage, current, phase, or other electric characteristic.
Varifocal lens	A camera lens in which the focus is not fixed, it can be manually or automatically adjusted.
VCR	Videocassette recorder; an electronic device for recording and playing back video images and sound on a videocassette.
Video capture card	Computer cards that you can install on the motherboard of your own computer to create your own video recording computer. Due to compatibility issues with this type of device, we do not sell these separately.
Video gain	An increase in video signal power by an amplifier, expressed as the ratio of output to input. Also called amplification.
Video input	A connection in a video controller or recording device that you can plug a camera into. The more video inputs (also called camera inputs) available on a device the more cameras you can connect to it.
Watch dog timer circuit protection	If problems are detected in the DVR computer the system will automatically reboot to correct the problem.
waterproof	A device that can be immersed in water and still function properly.
weatherproof	A device that is weatherproof can be installed outside and stand up to harsh weather conditions and temperatures. However, it does not mean that it is waterproof.
wireless camera	Wireless cameras allow the transmission of video and audio data to be transmitted to the receiver without having to run wires (using radiowaves).