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Skip-field
In video, skip field recording is a process in which only one field (one half of a frame) of video is recorded in order to conserve recording media space. For some kinds of recording, the quality loss of not using both fields of video is fairly negligible, it results in the loss of half of possible vertical video resolution and temporal resolution. It was a common method used in early telerecording systems, as well as early and current non-professional/industrial videotape formats such as CV-2000, Cartrivision and V-Cord. See also * Low-definition television Low-definition television (LDTV) refers to TV systems that have a lower screen resolution than standard-definition TV systems. The term is usually used in reference to digital TV, in particular when broadcasting at the same (or similar) resol ... Film and video technology {{Filming-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Video
Video is an electronic medium for the recording, copying, playback, broadcasting, and display of moving visual media. Video was first developed for mechanical television systems, which were quickly replaced by cathode-ray tube (CRT) systems which, in turn, were replaced by flat panel displays of several types. Video systems vary in display resolution, aspect ratio, refresh rate, color capabilities and other qualities. Analog and digital variants exist and can be carried on a variety of media, including radio broadcast, magnetic tape, optical discs, computer files, and network streaming. History Analog video Video technology was first developed for mechanical television systems, which were quickly replaced by cathode-ray tube (CRT) television systems, but several new technologies for video display devices have since been invented. Video was originally exclusively a live technology. Charles Ginsburg led an Ampex research team developing one of the first practical vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Field (video)
In video, a field is one of the many still images which are displayed sequentially to create the impression of motion on the screen. Two fields comprise one video frame. When the fields are displayed on a video monitor they are "interlaced" so that the content of one field will be used on all of the odd-numbered lines on the screen and the other field will be displayed on the even lines. Converting fields to a still frame image requires a process called deinterlacing, in which the missing lines are duplicated or interpolated to recreate the information that would have been contained in the discarded field. Since each field contains only half of the information of a full frame, however, deinterlaced images do not have the resolution of a full frame. In order to increase the resolution of video images, therefore, new schemes have been created that capture full-frame images for each frame. Video composed of such frames is called progressive scan video. Video shot with a standard vi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Video Frame
In filmmaking, video production, animation, and related fields, a frame is one of the many ''still images'' which compose the complete ''moving picture''. The term is derived from the historical development of film stock, in which the sequentially recorded single images look like a framed picture when examined individually. The term may also be used more generally as a noun or verb to refer to the edges of the image as seen in a camera viewfinder or projected on a screen. Thus, the camera operator can be said to keep a car in frame by panning with it as it speeds past. Overview When the moving picture is displayed, each frame is flashed on a screen for a short time (nowadays, usually 1/24, 1/25 or 1/30 of a second) and then immediately replaced by the next one. Persistence of vision blends the frames together, producing the illusion of a moving image. The frame is also sometimes used as a unit of time, so that a momentary event might be said to last six frames, the actual dur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telerecording
Kinescope , shortened to kine , also known as telerecording in Britain, is a recording of a television program on motion picture film, directly through a lens focused on the screen of a video monitor. The process was pioneered during the 1940s for the preservation, re-broadcasting and sale of television programmes before the introduction of quadruplex videotape, which from 1956 eventually superseded the use of kinescopes for all of these purposes. Kinescopes were the only practical way to preserve live television broadcasts prior to videotape. Typically, the term Kinescope can refer to the process itself, the equipment used for the procedure (a movie camera mounted in front of a video monitor, and synchronized to the monitor's scanning rate), or a film made using the process. The term originally referred to the cathode ray tube used in television receivers, as named by inventor Vladimir K. Zworykin in 1929. Hence, the recordings were known in full as kinescope films or kinesc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CV-2000
CV-2000 was one of the world's first home video tape recorders (VTR), introduced by Sony in August, 1965. The 'CV' in the model name stood for 'Consumer Video'. This was Sony's domestic format throughout the 1960s. It was the first fully transistorized VCR. The CV-2000 was developed by Sony engineer Nobutoshi Kihara. On its release, the CV-2000D machine was listed for US$695 (while a portable version in a more durable case, the CV-2000, was listed for $730). It used video tape in a reel-to-reel format, meaning the tape had to be manually threaded around the helical scan video head drum. The CV-2000 was one-tenth the weight and price of other analog video recording products of its era. It recorded television programs in black and white using the skip field process, which produced a maximum 200-lines resolution. The tape moved at a speed of 7.5 inches per second. Two different reels were marketed: A reel of video tape listed for about US$22 had 30-minute playtime, and video-ta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cartrivision
Cartrivision is an analog videocassette format introduced in 1972, and the first format to offer feature films for consumer rental.1972: Cartrivision — The First VCR with Prerecorded Tapes CED Magic, cedmagic.com. Article retrieved 2006-12-22. Cartrivision was produced by Frank Stanton's Cartridge Television, Inc. (CTI), a subsidiary of ,"Cartrivision — The First ALL American Home VCR!" [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
V-Cord
V-Cord is an analog recording videocassette format developed and released by Sanyo. V-Cord (later referred to as V-Cord I) was released in 1974, and could record 60 minutes on a cassette. V-Cord II, released in 1976, could record 120 minutes on a V-Cord II cassette. The V-Cord II machines were the first consumer VCRs to offer two recording speeds. Appearance The original V-Cord cassette had a large hub and was wound with standard-thickness magnetic tape; V-Cord II used a small hub wound with thin tape, the same thickness later used for VHS-120 and Beta L-750. The cassettes were not rectangular, being tapered at one narrow end. Unlike subsequent formats VHS and Betamax, which loaded with the tape facing front on the long side of the cassette, the V-Cord cartridge was loaded sideways with the narrow side serving as the "front" and the tape coming out the "side". The tape was held in place in the machine by a notch halfway down the right side of the tape, similar to the means by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Low-definition Television
Low-definition television (LDTV) refers to TV systems that have a lower screen resolution than standard-definition TV systems. The term is usually used in reference to digital TV, in particular when broadcasting at the same (or similar) resolution as low-definition analog TV systems. Mobile DTV systems usually transmit in low definition, as do all slow-scan TV systems. Sources The Video CD format uses a progressive scan LDTV signal (352×240 or 352×288), which is half the vertical and horizontal resolution of full-bandwidth SDTV. However, most players will internally upscale VCD material to 480/576 lines for playback, as this is both more widely compatible and gives a better overall appearance. No motion information is lost due to this process, as VCD video is not high-motion and only plays back at 25 or 30 frames per second, and the resultant display is comparable to consumer-grade VHS video playback. For the first few years of its existence, YouTube offered only one, low-de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
