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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.

Modern video cameras have numerous designs and uses, not all of which resemble the early television cameras.
  • Professional Video Camera s, such as those used in Television and sometimes film production; these may be studio-based or mobile.

  • Camcorder s, 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 Movie s, 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).

  • Webcam s, which provide digital video feeds for computer systems and networks, and other small digital cameras; such cameras are often extremely small, even smaller than CCTV security cameras. These cameras are sometimes incorporated directly into computer or communications hardware, particularly Mobile Phone s, PDAs , and some models of Laptop Computer . Larger video cameras (especially camcorders and CCTV cameras) can also be used as webcams, though many such units may need to pass their output through an Analog-to-digital Converter in order to 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).



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 Video s 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.

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 ) are also possible when the camera creating the feedback is in motion relative to the screen.


SEE ALSO