Progressive scan

Not to be confused with Progressive download.

Progressive scanning (alternatively referred to as noninterlaced scanning) is a format of displaying, storing, or transmitting moving images in which all the lines of each frame are drawn in sequence. This is in contrast to interlaced video used in traditional analog television systems where only the odd lines, then the even lines of each frame (each image called a video field) are drawn alternately, so that only half the number of actual image frames are used to produce video.[1] The system was originally known as "sequential scanning" when it was used in the Baird 240 line television transmissions from Alexandra Palace, United Kingdom in 1936. It was also used in Baird's experimental transmissions using 30 lines in the 1920s.[2] Progressive scanning became universally used in computer screens beginning in the early 21st century.[3]

  1. ^ "Interlacing". Luke's Video Guide. Archived from the original on 2014-02-22. Retrieved February 12, 2014.
  2. ^ Burns, R.W. John Logie Baird, Television Pioneer, Herts: The Institution of Electrical Engineers, 2000. 316.
  3. ^ Poynton, Charles A. (2003). Digital Video and Hdtv: Algorithms and Interfaces. Morgan Kaufmann. p. 56. ISBN 1558607927. Retrieved 27 January 2013.