video camera systems2

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.
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.
Reference : http://en.wikipedia.org/wiki/Video_camera

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.
Reference : http://en.wikipedia.org/wiki/Video_camera

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.
Reference : http://en.wikipedia.org/wiki/Video_camera

Video camera2

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.
Reference : http://en.wikipedia.org/wiki/Video_camera

Video camera

A video camera is a camera used for electronic motion picture acquisition, initially developed by the television industry but now common in other applications as well. The earliest video cameras were those of John Logie Baird, based on the electromechanical Nipkow disk and used by the BBC in experimental broadcasts through the 1930s. All-electronic designs based on the cathode ray tube, such as Vladimir Zworykin's Iconoscope and Philo T. Farnsworth's Image dissector, supplanted the Baird system by the 1940s and remained in wide use until the 1980s, when cameras based on solid-state image sensors such as CCDs (and later CMOS active pixel sensors) eliminated common problems with tube technologies such as burn-in and made digital video workflow practical.
Reference : http://en.wikipedia.org/wiki/Video_camera

External Capture Device

While external devices operate outside the PC chassis in most cases, their functionality is largely the same, in some cases identical silicon. Instead of using a PCI or AGP interface, an external device would use USB, Firewire, or a PC card to interface with the computer. These devices are more commonly associated with mobile or laptop computing because of their small sizes or portability.
Some (primarily Sony) MiniDV and Digital8 camcorders have analog inputs that can transcode to DV digital video and simultaneously output same via FireWire to a computer - these could also be recognized as video capture devices.
Reference : http://en.wikipedia.org/wiki/Video_capture_card

Video editing

Once a video source is digitally encoded in the computer, it can be edited with a variety of software tools available for the given computer platform. However, some capture cards are designed with this specifically in mind. These cards often have dedicated hardware for the express purpose of handling the rendering of video streams (instead of the CPU). Some of these cards even offer real-time video editing, or a specialized monitor connection which only displays the output of a video being edited as it would appear on a TV (sometimes an actual TV is used).
Editing cards also assist in the dubbing of sound on video clips, adding new sounds, synchronization of sound with video clip (e.g. lip movements are perfectly matched with dialogues), and other common post-production tasks like title generation.
Reference : http://en.wikipedia.org/wiki/Video_capture_card