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Cleared PsF and 2:2 pulldown confusion |
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With PsF, a progressive frame is separated into "segments", with the odd lines in one segment and the even lines in the other segment. This allows for a progressive picture to be processed through the same common electronic circuitry that is used to store, process and route interlaced video. The primary difference between PsF and interlaced video is motion. In PsF there is no motion between the two segments that make up the "progressive" frame while in interlaced there is typically motion between the "fields". The signal is played back at [[1080i]] but when viewed, it is seen as true [[1080p]]
== PsF and 2:2 pulldown ==
Progressive segmented frame technique is equivalent to [[Telecine|2:2 pulldown]] pattern. "PsF" seems to be a term used in production, while "2:2 pulldown" is a term used for 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&vq=segmented+frame&dq=segmented+frame&sig=8ZAl0RqzUYnyxQSmjxiIw4ZJDbE|title=Charles Poynton, "Digital Video and HDTV: Algorithms and Interfaces"}}</ref> He does not question the usefulness of progressive segmented frame to deliver progressive material for the end users; just one paragraph above he explains the technique to transfer movies to video: "Film is transferred to 575i video using 2:2 pulldown: Each film frame is scanned into two video fields (or frames); the film is run 4% fast."
PsF is not an alternative to [[Telecine]] 2:3 pulldown. [[Telecine]] 2:3 pulldown is a method of converting 23.976PsF to 59.94i for broadcast in [[NTSC]].
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