From 1939, Europe and the US tried 605 and 441 lines until, in 1941, the FCC mandated 525 for the US. The first electronic scanning format, 405 lines, was the first high definition television system, since the mechanical systems it replaced had far fewer. 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. 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. 480 scan lines is generally the minimum even though the majority of systems greatly exceed that. While there is no standardized meaning for high-definition, generally any video image with considerably more than 480 vertical scan lines (North America) or 576 vertical lines (Europe) is considered high-definition. High-definition video ( HD video) is video of higher resolution and quality than standard-definition. For other uses, see High definition (disambiguation) and HD (disambiguation). For high-definition video in broadcasting, see High-definition television.
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