Progressive sweeping
The progressive sweeping (progressive scan) is the view used by the screens having a great frequency of cooling: modern screen of computer, High definition television. On the screen, the image arrives in manner not interlaced. Each screen thus corresponds to a whole image, which is not the case of a signal of standard analogical television (sd-TV), where the image consists of two screens.
Progressive sweeping was used in an important way with the cathode tube screens of computers. Its use also spread with the advent of the high definition television, capable of désentrelacer the images.
This system was named “sequential sweeping” (sequential scanning) in 1936 when it was used in the televisual transmissions Baird 240 of Alexander Palace in England. The process was also used during the experimental transmissions of 30 lines of Baird .
The abbreviation p is used to indicate this sweeping (example: 480p, 720p); the opposite abbreviation is I (example: 1080i).
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