Interlaced videoInterlaced video (also known as interlaced scan) is a technique for doubling the perceived frame rate of a video display without consuming extra bandwidth. The interlaced signal contains two fields of a video frame captured consecutively. This enhances motion perception to the viewer, and reduces flicker by taking advantage of the characteristics of the human visual system.
DeinterlacingDeinterlacing is the process of converting interlaced video into a non-interlaced or progressive form. Interlaced video signals are commonly found in analog television, VHS, Betamax, Video 8, digital home video tapes such as Digital8 and DV tapes, CED Disc, LaserDisc, digital television when in the 1080i format, some DVD titles, and a smaller number of Blu-ray discs.Line doublerA line doubler is a device or algorithm used to deinterlace video signals prior to display on a progressive scan display. FunctionThe main function of a deinterlacer is to take an interlaced video frame which consists of 60 two-field interlaced fields of an NTSCanalogue video signal or 50 fields of a PAL signal, and create a progressive scan output.
Spatial anti-aliasingIn digital signal processing, spatial anti-aliasing is a technique for minimizing the distortion artifacts (aliasing) when representing a high-resolution image at a lower resolution. Anti-aliasing is used in digital photography, computer graphics, digital audio, and many other applications. Anti-aliasing means removing signal components that have a higher frequency than is able to be properly resolved by the recording (or sampling) device.
Film frameIn 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.
Field (video)Still image forming part of a video In video, a field is one of the many still images displayed sequentially to create the impression of motion on the screen. Normally, two fields comprise one video frame in what is known as 2:1 interlacing. 3:1, 4:1 and 5:1 interlacing also exist.
Analog televisionAnalog television is the original television technology that uses analog signals to transmit video and audio. In an analog television broadcast, brightness, color, and sound are represented by the amplitude, phase, and frequency of the signal. The strength of an analog signal varies over a continuous range of possible values, meaning that electronic noise and interference may be introduced. Thus, a moderately weak signal becomes snowy and subject to interference.
Alexandra PalaceAlexandra Palace is an entertainment and sports venue in north London, situated between Wood Green and Muswell Hill in the London Borough of Haringey. A Grade II listed building, it is built on the site of Tottenham Wood and the later Tottenham Wood Farm. It was designed by John Johnson and Alfred Meeson. It opened in 1873 but following a fire two weeks after its opening, was rebuilt by Johnson.
John Logie BairdJohn Logie Baird (; 13 August 1888 – 14 June 1946) was a Scottish inventor, electrical engineer and innovator who demonstrated the world's first mechanical television system on 26 January 1926. He went on to invent the first publicly demonstrated colour television system and the first viable purely electronic colour television picture tube. In 1928, the Baird Television Development Company achieved the first transatlantic television transmission.
Cathode ray tubeVacuum tube used to display imagesCathode ray tube cross section diagram (not to scale) with its focused and deflected electron beam (in green)Oscilloscope cathode ray tubeCutaway rendering of a color CRT:Electron guns (cathodes) for red, green, and blueElectron beamsFocusing coilsDeflection coilsAnode connectionShadow mask for separating beams for red, green, and blue parts of the displayed imagePhosphor layerClose-up of the phosphor layer showing red, green, and blue zonesCutaway rendering of a monochrome CRT:Deflection coilsElectron beamFocusing coilPhosphor layerFilament for heating the cathodeGraphite layer on the inner side of the tubeAnode connectionElectron gun (cathode)Air-tight glass body of the tubeScreenDeflection yokeControl electrode modulating the intensity of the electron beamContact pins for cathode, filament and control electrodeWire for anode high voltageThe only visible differences are the single electron gun, the uniform white phosphor coating, and the lack of a shadow mask.A Macintosh computer from the 1990s with integrated CRT displayA cathode ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams, which are directed and controlled to display images on a phosphorescent screen.FilmVisual art consisting of moving imagesA Trip to the Moon (1902) is considered to be a turning point in the development of narrative and science fiction films.A film, movie, or motion picture is a work of visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, emotions, or atmosphere through the use of moving images that are generally, since the 1930s, synchronized with sound and sometimes feature other sensory stimuli.*As an Amazon Associate I earn from qualifying purchases.