Features and function of webcam-What is a Webcam? - Definition from Techopedia

The term webcam is a combination of " Web " and "video camera. Webcams are typically small cameras that either attach to a user's monitor or sit on a desk. Most webcams connect to the computer via USB , though some use a Firewire connection. Webcams typically come with software that allows the user to record video or stream the video on the Web. If the user has a website that supports streaming video, other users can watch the video stream from their Web browsers.

Features and function of webcam

Features and function of webcam

Features and function of webcam

Features and function of webcam

The picture to the left is an example of how the XCoffee appeared online. For example, Apple's iSight camera, which is built into Apple laptops and iMacs, allows users to video chat using the Featuees instant messaging program. Retrieved February 19, Archived from the original on 10 August Related Articles. Free how-to guides for your website. Most webcams connect to the computer via USBFeatures and function of webcam some use a Firewire connection. Money Laundering, the Internet Way. Most webcams feature built-in microphones to make video calling and videoconferencing more convenient. When choosing a webcam, decide how much maneuverability you require from the body and lens.

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It just ot not been tested yet. Toggle navigation Menu. Coaxial cable Fiber-optic communication optical fiber Free-space optical communication Molecular communication Radio waves base station receiver RF circuit RF power amplifier transceiver transmitter Transmission line data transmission circuit power electronics power MOSFET power semiconductor device telecommunication circuit transistor. Video calling support has also been added to several popular instant messaging programs. In addition, after publishing your review, you will see how good is your compared camera to others. Featurez allowed users to call lines that charged a per minute rate usually for advice on a particular topic. Skype allows users to remove or edit individual messages during one hour after sending; this affects messages already received by chat interlocutors as well as not delivered to them yet. Retrieved October 5, If one of these limits is exceeded, any additional calls are billed at regular rates fuhction connection fees if the user has Skype Credit. We do not save technical information until the user posts his review. Because the SIGMA fp does not have a low-pass filter, it is able to capture images without losing the resolution of the sensor. Retrieved Features and function of webcam will bring a full-frame camera quality to webca streaming. An unexpected error occurred. Languages Add links.

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.

  • One example of custom coding is a set of commands that makes a Webcam image automatically refresh.
  • With overall dimensions of
  • For information on how to create the object with an input argument if you have multiple cameras connected, see Create a Webcam Object.
  • Check out how good your web camera is!
  • Skype offers a number of features based around calling both free and paid , messaging including instant, voice and text messaging SMS , video chat, and file and screen sharing.
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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 's iSight camera, which is built into Apple laptops, iMacs and a number of iPhones , can be used for video chat sessions, using the iChat instant messaging program now called Messages. Webcam software enables users to record a video or stream the video on the Internet. As video streaming over the Internet requires a lot of 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 cameras , are expensive, rugged professional video cameras. Webcams typically include a lens, an image sensor , support electronics, and may also include one or even two microphones for sound. Most consumer webcams are capable of providing VGA -resolution video at a frame rate of 30 frames per second. 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 lenses , 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-it ASIC to do video compression in real-time. Support electronics read the image from the sensor and transmit it to the host computer. Some cameras, such as mobile-phone cameras , use a CMOS sensor with supporting electronics "on die", i.

Most webcams feature built-in microphones to make video calling and videoconferencing more convenient. Further interfaces such as e. Composite video or S-Video are 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. Webcams are known for their low manufacturing cost and their high flexibility, [2] making them the lowest-cost form of videotelephony.

Despite the low cost, the resolution offered as of is impressive, with now the low-end webcams offering resolutions of p , mid-range webcams offering p 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 videophones or videoconference stations.

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:. Most modern webcams are capable of capturing arterial pulse rate by the use of a simple algorithmic trick.

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.

Webcam 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 cameras. Software is available to allow PC-connected cameras to watch for movement and sound, [7] 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, [8] 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 , Russia announced that , Webcams would be installed in 90, polling stations to monitor the Russian presidential election.

Webcams can be used to take video clips and still pictures. Various software tools in wide use can be employed for this, such as PicMaster for use with Windows operating systems , Photo Booth Mac , or Cheese with Unix systems. For a more complete list see Comparison of webcam software. 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. FreeTrack 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. 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.

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.

A webcam's CCD response is linear proportional to the incoming light. The resolution of a laser beam profiler depends on the pixel size. Commercial webcams are usually designed to record color images. 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 infra-red. First developed in , 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, The final image captured by the camera can still be viewed at its homepage. The first commercial webcam, the black-and-white QuickCam , entered the marketplace in , created by the U. 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 The original QuickCam provided xpixel resolution with a grayscale depth of 16 shades at 60 frames per second, or shades at 15 frames per second.

In , Time Magazine named the QuickCam as one of the top computer devices of all time. Videoconferencing via computers already existed, and at the time client-server based videoconferencing software such as CU-SeeMe had started to become popular. One of the most widely reported-on webcam sites was JenniCam , created in , which allowed Internet users to observe the life of its namesake constantly, in the same vein as the reality TV series Big Brother , launched four years later.

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. 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. 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 [23]. However, it is possible for malware to circumvent the indicator and activate the camera surrepticiously, as researchers demonstrated in the case of a MacBook 's built-in camera in 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.

The fraudulent process of attempting to hack into a person's webcam and activate it without the webcam owner's permission has been called camfecting.

The remotely activated webcam can be used to watch anything within the webcam's field of vision, sometimes the webcam owner itself. Camfecting is most often carried out by infecting the victim's computer with a virus that can provide the hacker access to the victim's webcam. This attack is specifically targeted at the victim's webcam, and hence the name camfecting , a portmanteau of the words cam and infecting. In January , some search engine queries were published in an online forum [24] which allow anyone to find thousands of Panasonic - and Axis 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 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 — and thereby infringed on their privacy rights.

School authorities admitted to secretly snapping over 66, photographs, including shots of students in the privacy of their bedrooms, including some with teenagers in various state of undress. Webcams allow for inexpensive, real-time video chat and webcasting , in both amateur and professional pursuits. They are frequently used in online dating and for online personal services offered mainly by women when camgirling.

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.

The 3. Money Laundering, the Internet Way. Archived from the original on The Complete Webcam Software Solution Take full advantage of your webcam with the functionality of a complete live video studio. All Rights Reserved. We do not in any way store photos taken by users with their webcams. Since this feature was removed in Skype 5, the edit setting no longer exists in the config.

Features and function of webcam

Features and function of webcam

Features and function of webcam. Supported Functions for Webcam

Take full advantage of your webcam with the functionality of a complete live video studio. Apply webcam effects like real-time skin enhancements to ensure that you always look great online or use one of over fun effects for video chats and recordings. With an array of offline video and photo editing and correction tools you'll be ready to transform the way you chat, broadcast, and stream online with YouCam 8.

YouCam makes you look perfect in every video chat. Apply YouCam features during your live streams and engage more with your community of followers. Plus, enjoy additional presets, settings, and exclusive features while streaming. Whether you're chatting online, or livestreaming on Facebook or YouTube, real-time skin smoothing reduces visible blemishes and wrinkles on your face. Start chatting instantly using a huge range of webcam effects, emoticons, particles, frames, scenes and more to liven up your chats and online broadcasts.

You can also take full control by manually adjusting noise reduction, contrast, and brightness. YouCam comes with a range of built-in, professionally designed presets for your webcam chats and real-time recordings.

Edit your recordings with advanced video editing tools, and deliver engaging, captivating content to your followers! Choose from over fun and exciting effects, animojis, filters, particles, and distortions to apply to your video chats and video recording projects. Choose from over lively effects that can be applied to your video chats and video recording projects, with thousands more available for download on DirectorZone and ready to enhance your webcam software immediately.

Both frames and scenes let you blend the image from your webcam with another image effect. Use them to spice up your video and compose the perfect portrait or profile picture. The many webcam effects available in YouCam include colorful interactive particles, as well as many funhouse-like filter and distortion effects. Redefine your universe with particles filters and distortions.

Choose face-tracking accessories that move when you do, and communicate how you really feel with hilarious animojis. They can also be paired with other effects to double the fun! Capture and enhance your webcam software videos and photos with a range of simple tools. The ideal way to create the perfect profile picture for Facebook or LinkedIn. Enhance webcam photos using a range of brush sizes and colors, or try freestyle drawing using your fingers on a touch-screen.

Use photo presets to add an artistic touch to your pictures. Rotate and crop webcam photos to extract the best parts. Alternately you can trim recordings to save as new, short clips that you can post online, or use in larger video editing projects.

For even more easy-to-use video editing features check out PowerDirector. TrueTheater Color instantly optimizes hues and vibrancy of videos you've recorded, giving your action and family videos a true-to-life appearance. TrueTheater HD gives standard definition webcam recordings the look and feel of true high-definition, without jagged edges and distracting video artifacts.

Use your webcam as an extra home security camera for peace of mind. With YouCam's motion detection technology, your webcam, webcam software, and PC function as a home security system. You can also set up time-lapse recording, and YouCam will take a snapshot at the time interval set by you. Your face is the most reliable password.

Face Login will remember your passwords, and log you into Windows when you present your face in front of the webcam. For added security, YouCam can lock the PC screen when your face is not in front the webcam. By using our website, you acknowledge and agree to our cookie policy. Search MathWorks. Open Mobile Search. All Examples Functions. Toggle navigation. Trial Software Product Updates. Function Purpose webcamlist Returns list of webcams that are connected to your system. If you have multiple cameras and you use the webcam function with no input argument, it creates the object and connects it to the first camera it finds.

Use name of object as input argument, which is cam in this example. Select a Web Site Choose a web site to get translated content where available and see local events and offers. Select web site. Returns list of webcams that are connected to your system.

Webcam - Wikipedia

Here is an article from guest writer Rashed Khan. It contains information on choosing a webcam, including an explanation of the features you should consider in your search. The amount of money that you spend on your webcam normally has a direct correlation to its functionality. Should you only require a webcam for keeping in touch with friends, a lower quality, less expensive webcam will suffice. For a more professional use, a webcam that has video conferencing functionality may be more appropriate with its additional picture enhancement features.

Webcams can vary in many ways such as size, shape, specification and price; follow these 5 tips to help you choose the best webcam for your individual needs:. Megapixels — The megapixels are the tiny dots of colour that, when combined, make the resulting visual image.

A webcam with more megapixels will result in a clearer more vivid image. Today, the number of megapixels is not as big of an issue as it was in the past. Most webcams now will provide a reasonable image quality; however, the general advice is to go for a webcam that has X or X pixels for a good image. If you have the functionality of HD, consider a better specification for your webcam of X pixels.

Frame Rate — As the megapixels deal with image and colour vividness, the frame rate is what controls how smooth the video quality is. Frame Rate decides how many images per second are displayed.

Those looking for a smoother, higher quality moving image should consider a webcam with the capabilities of 60fps. Lens Quality — the lens is the first stage in the video process therefore it is vital that you have the correct lens to cater for your needs.

A webcam with a glass lens is much better than one with a plastic lens. Continuous Autofocus — In many scenarios there can be a lot of activity happening during a webcam session, autofocus AF enables the webcam to keep you as the main focus rather than diverting to other movements within the frame.

Low Light Quality — If you tend to use your webcam during the evening or in low light conditions, the resulting image quality can be very poor.

By tampering with the screen brightness and contrast, you create a hazy and continued poor image on screen. This enables the image quality to be optimised in these poor light conditions. Another issue to consider when contemplating the use of a webcam is the speed of your Internet connection. I recommend the fastest broadband speed you can afford, to avoid jerky, stop and start video images. This requirement pertains to both ends of the teleconference session.

Many folks have purchased webcams only to be disappointed by the poor video quality due to the above communications and computer shortcomings. Filed under home computing , How-To Corner. Tagged as autofocus , broadband , computer , frame rate , Internet , lens quality , low light quality , megapixels , Paul Lubic , Paul's Home Computing Blog , processor , Rashed Khan , video conferencing , webcam.

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Skip to content. Webcams can vary in many ways such as size, shape, specification and price; follow these 5 tips to help you choose the best webcam for your individual needs: Megapixels — The megapixels are the tiny dots of colour that, when combined, make the resulting visual image.

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Features and function of webcam