A webcam is a video camera
that feeds or streams
an image or video in real time to or through a computer
to a computer network
, such as the Internet
. Webcams are typically small cameras that sit on a desk, attach to a user's monitor, or are built into the hardware. Webcams can be used during a video chat session involving two or more people, with conversations that include live audio and video. For example, Apple
camera, which is built into Apple laptops, iMacs and a l of iPhone
s, can be used for video chat sessions, using the Messages
instant messaging program. Webcam software enables users to record a video or stream the video on the Internet. As video streaming over the Internet requires much bandwidth
, such streams usually use compressed formats
. The maximum resolution of a webcam is also lower than most handheld video cameras, as higher resolutions would be reduced during transmission. The lower resolution enables webcams to be relatively inexpensive compared to most video cameras, but the effect is adequate for video chat sessions.
The term "webcam" (a clipped compound
) may also be used in its original sense of a video camera
connected to the Web
continuously for an indefinite time, rather than for a particular session, generally supplying a view for anyone who visits its web page
over the Internet. Some of them, for example, those used as online traffic camera
s, are expensive, rugged professional video camera
Webcams typically include a lens, an image sensor
, support electronics, and may also include one or even two microphone
s for sound.
Image sensors can be CMOS
, the former being dominant for low-cost cameras, but CCD cameras do not necessarily outperform CMOS-based cameras in the low-price range. Most consumer webcams are capable of providing VGA
-resolution video at a frame rate
of 30 frames per second. Many newer devices can produce video in multi-megapixel
resolutions, and a few can run at high frame rates such as the PlayStation Eye
, which can produce 320×240
video at 120 frames per second. The Wii Remote
contains an image sensor with a resolution of 1024×768 pixels.
As the bayer filter
is proprietary, any webcam contains some built-in image processing
, separate from compression.
Various lenses are available, the most common in consumer-grade webcams being a plastic lens
that can be manually moved in and out to focus the camera. Fixed-focus lens
es, which have no provision for adjustment, are also available. As a camera system's depth of field
is greater for small image formats and is greater for lenses with a large f-number
(small aperture), the systems used in webcams have a sufficiently large depth of field that the use of a fixed-focus lens does not impact image sharpness to a great extent.
Most models use simple, focal-free optics (fixed focus, factory-set for the usual distance from the monitor to which it is fastened to the user) or manual focus.
Digital video streams are represented by huge amounts of data, burdening its transmission (from the image sensor, where the data is continuously created) and storage alike.
Most if not all cheap webcams come with built-in ASIC
to do video compression
Support electronics read the image from the sensor and transmit it to the host computer. The camera pictured to the right, for example, uses a Sonix SN9C101 to transmit its image over USB
. Typically, each frame is transmitted uncompressed in RGB
or compressed as JPEG
. Some cameras, such as mobile-phone cameras
, use a CMOS sensor with supporting electronics "on die", i.e. the sensor and the support electronics are built on a single silicon chip
to save space and manufacturing costs. Most webcams feature built-in microphone
s to make video calling
Typical interfaces used by articles marketed as a "webcam" are USB
and IEEE 802.11
(denominated as IP camera
). Further interfaces such as e.g. Composite video
were also available.
The USB video device class
(UVC) specification allows inter-connectivity of webcams to computers without the need for proprietary device drivers.
Various proprietary as well as free and open-source software is available to handle the UVC stream. One could use Guvcview
and GStreamer-based software to handle the UVC stream. Another could use multiple USB cameras attached to the host computer the software resides on, and broadcast multiple streams at once over (Wireless) Ethernet, such as MotionEye. MotionEye can either be installed onto a Raspberry Pi as MotionEyeOs, or afterwards on Raspbian as well. MotionEye can also be set up on Debian, Raspbian is a variant of Debian.
Webcams are known for their low manufacturing
cost and their high flexibility, making them the lowest-cost form of videotelephony
. As webcams evolved simultaneously with display technologies, USB interface speeds and broadband internet speeds, the resolution went up from gradually from 320×240, to 640×480, and some now even offer 1280×720 (aka 720p
) or 1920×1080 (aka 1080p
Despite the low cost, the resolution
offered as of 2019 is impressive, with now the low-end webcams offering resolutions of 720p
, mid-range webcams offering 1080p
resolution, and high-end webcams offering 4K resolution at 60 fps.
Webcams have become a source of security and privacy issues, as some built-in webcams can be remotely activated by spyware
. To address this concern, many webcams come with a physical lens cover.
The most popular use of webcams is the establishment of video links
, permitting computers to act as videophone
s or videoconference station
s. Other popular uses include security surveillance, computer vision
, video broadcasting, and for recording social videos.
The video streams provided by webcams can be used for a number of purposes, each using appropriate software:
Webcams may be installed at places such as childcare centres, offices, shops and private areas to monitor security and general activity.
Webcams have been used for augmented reality
experiences online. One such function has the webcam act as a "magic mirror" to allow an online shopper to view a virtual item on themselves. The Webcam Social Shopper
is one example of software that utilizes the webcam in this manner.
Videocalling and videoconferencing
Webcams can be added to instant messaging
, text chat services such as AOL Instant Messenger
, and VoIP
services such as Skype
, one-to-one live video communication over the Internet has now reached millions of mainstream PC
users worldwide. Improved video quality has helped webcams encroach on traditional video conferencing systems. New features such as automatic lighting controls, real-time enhancements (retouching, wrinkle smoothing and vertical stretch), automatic face tracking
and autofocus, assist users by providing substantial ease-of-use, further increasing the popularity of webcams.
Webcam features and performance can vary by program
, computer operating system
, and also by the computer's processor
capabilities. Video calling support has also been added to several popular instant messaging programs
Webcams can be used as security camera
s. Software is available to allow PC-connected cameras to watch for movement and sound, recording both when they are detected. These recordings can then be saved to the computer, e-mailed, or uploaded to the Internet. In one well-publicised case, a computer e-mailed images of the burglar during the theft of the computer, enabling the owner to give police a clear picture of the burglar's face even after the computer had been stolen.
Unauthorized access of webcams can present significant privacy issues (see "Privacy" section below).
In December 2011, Russia announced that 290,000 Webcams would be installed in 90,000 polling stations to monitor the 2012 Russian presidential election
Video clips and stills
Webcams can be used to take video clip
s and still pictures
. Various software tools in wide use can be employed for this, such as PicMaster
and Microsoft's Camera app (for use with Windows
operating systems), Photo Booth
), or Cheese
systems). For a more complete list see Comparison of webcam software
Input control devices
Special software can use the video stream from a webcam to assist or enhance a user's control of applications and games. Video features, including faces, shapes, models and colors can be observed and tracked to produce a corresponding form of control. For example, the position of a single light source can be tracked and used to emulate a mouse pointer, a head-mounted light would enable hands-free computing
and would greatly improve computer accessibility
. This can be applied to games, providing additional control, improved interactivity and immersiveness.
is a free webcam motion-tracking application for Microsoft Windows
that can track a special head-mounted model in up to six degrees of freedom
and output data to mouse, keyboard, joystick and FreeTrack-supported games
. By removing the IR filter of the webcam, IR LEDs can be used, which has the advantage of being invisible to the naked eye, removing a distraction from the user. TrackIR
is a commercial version of this technology.
for the PlayStation 2
, PlayStation Eye
for the PlayStation 3
, and the Xbox Live Vision
camera and Kinect
motion sensor for the Xbox 360
and are color digital cameras that have been used as control input devices by some games.
Small webcam-based PC games
are available as either standalone executables or inside web browser windows using Adobe Flash
With very-low-light capability, a few specific models of webcams are very popular to photograph the night sky by astronomers and astro photographers. Mostly, these are manual-focus cameras and contain an old CCD array instead of comparatively newer CMOS array. The lenses of the cameras are removed and then these are attached to telescopes to record images, video, still, or both. In newer techniques, videos of very faint objects are taken for a couple of seconds and then all the frames of the video are "stacked" together to obtain a still image of respectable contrast.
Laser beam profiling
A webcam's CCD response is linear proportional to the incoming light. Therefore, webcams are suitable to record laser beam profiles, after the lens is removed. The resolution of a laser beam profiler
depends on the pixel size. Commercial webcams are usually designed to record color images. The size of a webcam's color pixel depends on the model and may lie in the range of 5 to 10 µm. However, a color pixel consists of four black and white pixels each equipped with a color filter (for details see Bayer filter
). Although these color filters work well in the visible, they may be rather transparent in the near infrared. By switching a webcam into the Bayer-mode it is possible to access the information of the single pixels and a resolution below 3 µm was possible.
First developed in 1991, a webcam was pointed at the Trojan Room coffee pot
in the Cambridge University
Computer Science Department (initially operating over a local network instead of the web). The camera was finally switched off on August 22, 2001. The final image captured by the camera can still be viewed at its homepage. The oldest continuously operating webcam, San Francisco State University
's FogCam, has run since 1994 and was slated to turn off August 2019. After the publicity following extensive news coverage about the planned ending of FogCam, SFSU agreed to continue maintaining the FogCam and keep it running.
The first commercial webcam, the black-and-white QuickCam
, entered the marketplace in 1994, created by the U.S. computer company Connectix
. QuickCam was available in August 1994 for the Apple Macintosh
, connecting via a serial port
, at a cost of $100. Jon Garber, the designer of the device, had wanted to call it the "Mac-camera", but was overruled by Connectix's marketing department; a version with a PC-compatible parallel port and software for Microsoft Windows
was launched in October 1995. The original QuickCam provided 320x240-pixel resolution with a grayscale depth of 16 shades at 60 frames per second, or 256 shades at 15 frames per second. These cam were tested on several Delta II launch using a variety of communication protocols including CDMA, TDMA, GSM and HF.
In 2010, Time Magazine
named the QuickCam as one of the top computer devices of all time.
via computers already existed, and at the time client-server
based videoconferencing software such as CU-SeeMe
had started to become popular.
RS/6000 integrated webcam
The first widely known laptop with integrated webcam option, at a pricepoint starting at US$ 12,000, was an IBM RS/6000
860 laptop and his ThinkPad 850 sibling, released in 1996.
One of the most widely reported-on webcam sites was JenniCam
, created in 1996, which allowed Internet users to observe the life of its namesake constantly, in the same vein as the reality TV series
'', launched four years later. Other cameras are mounted overlooking bridges, public squares, and other public places, their output made available on a public web page in accordance with the original concept of a "webcam". Aggregator websites have also been created, providing thousands of live video streams or up-to-date still pictures, allowing users to find live video streams based on location or other criteria.
Around the turn of the 21st century, computer hardware manufacturers began building webcams directly into laptop
and desktop screens, thus eliminating the need to use an external USB or FireWire
camera. Gradually webcams came to be used more for telecommunications, or videotelephony
, between two people, or among several people, than for offering a view on a Web page to an unknown public.
For less than US$100 in 2012, a three-dimensional space
webcam became available, producing videos and photos in 3D anaglyph image
with a resolution up to 1280 × 480 pixels. Both sender and receiver of the images must use 3D glasses to see the effect of three dimensional image.
Many users do not wish the continuous exposure for which webcams were originally intended, but rather prefer privacy. Such privacy is lost when malware
allow malicious hackers
to activate the webcam without the user's knowledge, providing the hackers with a live video and audio feed. This is a particular concern on many laptop computers, as such cameras normally cannot be physically disabled if hijacked by such a Trojan Horse
program or other similar spyware
Cameras such as Apple
's older external iSight
cameras include lens covers to thwart this. Some webcams have built-in hardwired LED
indicators that light up whenever the camera is active, sometimes only in video mode.
However, it is possible for malware
to circumvent the indicator and activate the camera surreptitiously, as researchers demonstrated in the case of a MacBook
's built-in camera in 2013.
Various companies sell sliding lens covers and stickers that allow users to retrofit a computer or smartphone to close access to the camera lens as needed.
One such company reported having sold more than 250,000 such items from 2013 to 2016.
However, any opaque material will work. Prominent users include former FBI director James Comey
The process of attempting to hack into a person's webcam and activate it without the webcam owner's permission has been called camfecting
, from ''cam'' ad ''infecting''. The remotely activated webcam can be used to watch anything within the webcam's field of vision. Camfecting is most often carried out by infecting the victim's computer with a virus.
In January 2005, some search engine
queries were published in an online forum which allow anyone to find thousands of Panasonic
high-end web cameras, provided that they have a web-based interface
for remote viewing. Many such cameras are running on default configuration, which does not require any password
login or IP address
verification, making them viewable by anyone.
In the 2010 ''Robbins v. Lower Merion School District
'' "WebcamGate" case, plaintiffs charged that two suburban Philadelphia high schools secretly spied on students by surreptitiously remotely activating iSight webcams embedded in school-issued MacBook
laptops the students were using at home—thereby infringing on their privacy rights. School authorities admitted to secretly snapping over 66,000 photographs, including shots of students in the privacy of their bedrooms, and some with teenagers in various states of undress.
["Initial LANrev System Findings"](_blank)
, LMSD Redacted Forensic Analysis, L-3 Services – prepared for Ballard Spahr (LMSD's counsel), May 2010. Retrieved August 15, 2010.
The school board involved quickly disabled their laptop spyware program after parents filed lawsuits against the board and various individuals.
Effects on modern society
Webcams allow for inexpensive, real-time video chat
, in both amateur and professional pursuits. They are frequently used in online dating
and for online personal services offered mainly by women when camgirl
ing. However, the ease of webcam use through the Internet for video chat has also caused issues. For example, moderation system of various video chat websites such as Omegle
has been criticized as being ineffective, with sexual content still rampant. In a 2013 case, the transmission of nude photos and videos via Omegle from a teenage girl to a schoolteacher resulted in a child pornography
is a popular website hosting many videos made using webcams. News websites such as the BBC
also produce professional live news videos using webcams rather than traditional cameras.
Webcams can also encourage telecommuting
, enabling people to work from home via the Internet, rather than traveling to their office.
The popularity of webcams among teenagers with Internet access has raised concern about the use of webcams for cyber-bullying
. Webcam recordings of teenagers, including underage teenagers, are frequently posted on popular Web forums and imageboard
s such as 4chan
Descriptive names and terminology
''Videophone calls'' (also: ''videocalls
'' and ''video chat
''), differ from videoconferencing
in that they expect to serve individuals, not groups.
[Mulbach, 1995. Pg. 291.]
However that distinction has become increasingly blurred with technology improvements such as increased bandwidth
and sophisticated software client
s that can allow for multiple parties on a call. In general everyday usage the term ''videoconferencing'' is now frequently used instead of ''videocall'' for point-to-point calls between two units. Both videophone calls and videoconferencing are also now commonly referred to as a ''video link''.
Webcams are popular, relatively low cost devices which can provide live video and audio streams via personal computers, and can be used with many software clients
for both video calls and videoconferencing.
A videoconference system
is generally higher cost than a videophone and deploys greater capabilities. A ''videoconference'' (also known as a ''videoteleconference'') allows two or more locations to communicate via live, simultaneous two-way video and audio transmissions. This is often accomplished by the use of a multipoint control unit
(a centralized distribution and call management system) or by a similar non-centralized multipoint capability embedded in each videoconferencing unit. Again, technology improvements have circumvented traditional definitions by allowing multiple party videoconferencing via web-based applications.
A separate webpage article is devoted to videoconferencing
A telepresence system
is a high-end videoconferencing system and service usually employed by enterprise-level
corporate offices. Telepresence conference rooms use state-of-the art room designs, video cameras, displays, sound-systems and processors, coupled with high-to-very-high capacity bandwidth transmissions.
Typical use of the various technologies described above include calling or conferencing on a one-on-one, one-to-many or many-to-many basis for personal, business, educational, deaf Video Relay Service
and tele-medical, diagnostic
use or services. New services utilizing videocalling and videoconferencing, such as teachers and psychologists conducting online sessions,
USA Today. "Video Chat Growing by Light-Year Leaps", ''USA Today'', March 31, 2010, p. L01d.
personal videocalls to inmates incarcerated in penitentiaries
, and videoconferencing to resolve airline engineering issues
at maintenance facilities
, are being created or evolving on an ongoing basis.
* Action camera
* Camera phone
* Comparison of webcam software
* Document camera
* IP camera
and IBM UltraPort
* List of webcameras and videophones
* Optic Nerve (GCHQ)
* Pan tilt zoom camera
* Trail Camera
– special outdoor Digital Camera that operates on batteries and saves motion detected images to SDcard
* Mulbach, Lothar; Bocker, Martin; Prussog, Angela. "Telepresence in Videocommunications: A Study on Stereoscopy and Individual Eye Contact", ''Human Factors
'', June 1995, Vol.37, No.2, p. 290, , Gale Document Number: GALE|A18253819. Accessed December 23, 2011 via General Science eCollection (subscription).
* Bajaj, VikasTransparent Government, Via Webcams in India
''The New York Times
'', July 18, 2011, p.B3. Published online: July 17, 2011.
* getluminaTips for Finding a Good Webcam
JAN 28, 2021.
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