Progressive segmented frame: Difference between revisions

Revision as of 20:42, 13 January 2008

Revision as of 05:39, 14 January 2008

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== PsF and 2:2 pulldown ==

Progressive segmented frame technique is equivalent to [[Telecine|2:2 pulldown]] pattern. It seems that "PsF" seemsis toused befor amaterial termoriginated usedon in productionvideo, while "2:2 pulldown" isseems ato termbe used for [[Telecine|telecine]] process, and in broadcast.

Charles Poynton, an authority in digital television, makes the following remark in his book: "Proponents of [PsF] scheme claim compatibility with interlaced processing and recording equipment, a dubious objective in my view."<ref>{{cite web|url=http://books.google.com/books?id=ra1lcAwgvq4C&pg=RA1-PA62&sig=8ZAl0RqzUYnyxQSmjxiIw4ZJDbE|title=Charles Poynton, "Digital Video and HDTV: Algorithms and Interfaces"}}</ref> He does not question the usefulness of progressive segmented frame for broadcast purposes; just one paragraph above he explains the technique used to transfer movies to video: "Film is transferred to 576i video using 2:2 pulldown: Each film frame is scanned into two video fields (or frames); the film is run 4% fast."