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Encyclopedia > Video camera

Video cameras are used primarily in two modes. The first, characteristic of much early television, is what might be called a live broadcast, where the camera feeds real time images directly to a screen for immediate observation; in addition to live television production, such usage is characteristic of security, military/tactical, and industrial operations where surreptitious or remote viewing is required. The second is to have the images recorded to a storage device for archiving or further processing; videotape is traditional for this purpose, but optical disc media, hard disk, and flash memory are all used as well. Recorded video is used not only in television and film production, but also surveillance and monitoring tasks where unattended recording of a situation is required for later analysis. Live broadcast is live broadcasting. ... It has been suggested that Real-time computing be merged into this article or section. ... Bottom view of VHS videotape cassette with magnetic tape exposed Videotape is a means of recording images and sound onto magnetic tape as opposed to movie film. ... “Optical media” redirects here. ... Typical hard drives of the mid-1990s. ... A USB flash drive. ...

Modern video cameras have numerous designs and uses, not all of which resemble the early television cameras.

  • Professional video cameras, such as those used in television and sometimes film production; these may be studio-based or mobile. Such cameras generally offer extremly fine-grained manual control for the camera operator, often to the exclusion of automated operation.
  • Camcorders, which combine a camera and a VCR or other recording device in one unit; these are mobile, and are widely used for television production, home movies, electronic news gathering (including citizen journalism), and similar applications.
  • Closed-circuit television cameras, generally used for security, surveillance, and/or monitoring purposes. Such cameras are designed to be small, easily hidden, and able to operate unattended; those used in industrial or scientific settings are often meant for use in environments that are normally inaccessible or uncomfortable for humans, and are therefore hardened for such hostile environments (e.g. radiation, high heat, or toxic chemical exposure). Webcams can be considered a type of CCTV camera.
  • Digital cameras which convert the signal directly to a digital output; such cameras are often extremely small, even smaller than CCTV security cameras, and are often used as webcams or optimized for still-camera use. These cameras are sometimes incorporated directly into computer or communications hardware, particularly mobile phones, PDAs, and some models of laptop computer. Larger video cameras (especially camcorders and CCTV cameras) can also be used as webcams or for other digital input, though such units may need to pass their output through an analog-to-digital converter in order to store the output or send it to a wider network.
  • Special systems, like those used for scientific research, e.g. on board a satellite or a spaceprobe, or in artificial intelligence and robotics research. Such cameras are often tuned for non-visible light such as infrared (for night vision and heat sensing) or X-ray (for medical and astronomical use).

Sony camera head with Betacam SP dock recorder. ... Sony DV Handycam A camcorder is a portable electronic device for recording video images and audio onto an internal storage device. ... The video cassette recorder (or VCR, less popularly video tape recorder) is a type of video tape recorder that uses removable cassettes containing magnetic tape to record audio and video from a television broadcast so it can be played back later. ... Home movie, referring to any private or amateur motion picture photographic product shot and printed in any movie film format. ... In 1974, Joseph Flaherty, then vice-president at CBS Inc. ... Citizen journalism, also known as participatory journalism, or people journalism is the act of citizens playing an active role in the process of collecting, reporting, analyzing and disseminating news and information, according to the seminal report We Media: How Audiences are Shaping the Future of News and Information, by Shayne... Surveillance cameras. ... A typical webcam A web camera (or webcam) is a real-time camera (usually, though not always, a video camera) whose images can be accessed using the World Wide Web, instant messaging, or a PC video calling application. ... A SiPix digital camera next to a matchbox to show scale Nikon D200 SLR with Nikon film scanner, which converts film images to digital A Hasselblad 503CW with a digital camera back A digital camera is an electronic device used to capture and store photographs digitally, instead of using photographic... A typical webcam A web camera (or webcam) is a real-time camera (usually, though not always, a video camera) whose images can be accessed using the World Wide Web, instant messaging, or a PC video calling application. ... Look up Personal digital assistant in Wiktionary, the free dictionary. ... Laptop with touchpad. ... 4-channel stereo multiplexed analog-to-digital converter WM8775SEDS made by Wolfson Microelectronics placed on X-Fi Fatal1ty Pro sound card An analog-to-digital converter (abbreviated ADC, A/D or A to D) is an electronic integrated circuit (i/c) that converts continuous signals to discrete digital numbers. ... For other uses, see Satellite (disambiguation). ... Unmanned space missions are those using remote-controlled spacecraft. ... Bold text[[Link title]] “AI” redirects here. ... Robotics is the science and technology of robots, their design, manufacture, and application. ... For other uses, see Infrared (disambiguation). ... Night-vision is seeing in the dark. ... In the NATO phonetic alphabet, X-ray represents the letter X. An X-ray picture (radiograph) taken by Röntgen An X-ray is a form of electromagnetic radiation with a wavelength approximately in the range of 5 pm to 10 nanometers (corresponding to frequencies in the range 30 PHz...

Common issues with video camera systems

Some people find video to have a grainy and less desirable look than film, and indeed a great many music videos have traditionally been shot on film rather than videotape. With the rise of digital video, however, it has become practical to emulate the "film look" using progressive scan and improved telecine techniques. Many television shows (and even theatrical movies) which would in the past have been shot on film are now done using video, and the capability to do this exists even in some high-end consumer/prosumer equipment. A music video is a short film or video that accompanies a complete piece of music, most commonly a song. ... Digital video is a type of video recording system that works by using a digital, rather than analog, of the video signal. ... Progressive scan Progressive or noninterlaced scanning is any method for displaying, storing or transmitting moving images in which the lines of each frame are drawn in sequence. ... Telecine (IPA pronunciation: . Phonetic: tel-e-Sin-ee; tel-e-Sin-a as cine is the same root as in cinema; also tele-seen.) is the process of transferring motion picture film into electronic form, or the machine used in this process. ... Prosumer refers to one of two possible portmanteaus formed by contracting either the word producer or professional with the word consumer. ...

When imaging a separate video source (i.e. a computer monitor or television, usually one that produces a scanned image), there is often substantial visual artifacting (rolling bars on the monitor screen, for example) generated by differing timing signals between the monitor and the camera. This is generally only an issue with CRT displays and is not common on non-scanning displays such as LCD units. Cathode ray tube employing electromagnetic focus and deflection Cutaway rendering of a color CRT: 1. ... “LCD” redirects here. ...

Similar to audio equipment, video cameras are subject to optical feedback effects. This has sometimes been used to create special video effects (most notably the titles of the first seasons of Doctor Who, ultimately refined into the Tom Baker-era "time vortex" graphic). A more common effect is sometimes referred to as an "endless hallway", that is, an infinite regression consisting of the screen showing pictures of itself; certain stroboscopic effects (shown in a montage in Douglas Hofstadter's Gödel, Escher, Bach: An Eternal Golden Braid) are also possible when the camera creating the feedback is in motion relative to the screen. Optical feedback Credit: Profero Graphics Two Screenshots of optical feedback Credit: Profero Graphics Optical feedback is the optical equivalent of acoustic feedback. ... For other uses, see Doctor Who (disambiguation). ... For other persons named Tom Baker, see Tom Baker (disambiguation). ... Douglas Richard Hofstadter (born February 15, 1945) is an American academic. ...

See also

Look up Video camera in
Wiktionary, the free dictionary.

  Results from FactBites:
Video - Wikipedia, the free encyclopedia (945 words)
Video (from Latin, "I see") is the technology of processing electronic signals for representing moving pictures.
Video can be created with mechanical cameras (capture on celluloid film), video cameras (capture electric signal in PAL or NTSC formats) or digital cameras (commonly capture in digital MPEG-4 or DV formats).
In the UK, the term 'video' is often used informally to refer to both video recorders and video cassettes; the meaning is normally clear from the context.
  More results at FactBites »



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