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High-definition video is video of higher resolution and quality than standard-definition.
A frame or field rate can also be specified without a resolution.
The aspect ratio of regular widescreen film shot today is typically 1.85:1 or 2.39:1 (sometimes traditionally quoted at 2.35:1).
Standard-definition television (SDTV) has a 4:3 (1.33:1) aspect ratio, although in recent years many broadcasters have transmitted programs "squeezed" horizontally in 16:9 anamorphic format, in hopes that the viewer has a 16:9 set which stretches the image out to normal-looking proportions, or a set which "squishes" the image vertically to present a "letterbox" view of the image, again with correct proportions.
Images of standard resolution captured at rates faster than normal (60 frames/second North America, 50 fps Europe), by a high-speed camera may be considered high-definition in some contexts.
Some television series shot on high-definition video are made to look as if they have been shot on film, a technique which is often known as filmizing.
The first electronic scanning format, 405 lines, was the first "high definition" television system, since the mechanical systems it replaced had far fewer.
From 1939, Europe and the US tried 605 and 441 lines until, in 1941, the FCC mandated 525 for the US.In essence, the end of the 1980s was a death knell for most analog high definition technologies that had developed up to that time.The FCC process, led by the Advanced Television Systems Committee (ATSC) adopted a range of standards from interlaced 1,080-line video (a technical descendant of the original analog NHK 1125/30 Hz system) with a maximum frame rate of 60 Hz, and 720-line video, progressively scanned, with a maximum frame rate of 60 Hz.Most HDTV systems support some standard resolutions and frame or field rates. High-definition signals require a high-definition television or computer monitor in order to be viewed.High-definition video has an aspect ratio of 16:9 (1.78:1).All attempts at using this format for terrestrial TV transmission were abandoned by the mid-1990s.