Progressive segmented frame: Difference between revisions

Revision as of 08:16, 17 July 2012

Revision as of 17:14, 12 October 2012

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With PsF, a progressive frame is divided into two ''segments'', with the odd lines in one segment and the even lines in the other segment. Technically, the segments are equivalent to interlaced ''fields'', but unlike native interlaced video, there is no motion between the two fields that make up the video frame: both fields represent the same instant in time. This technique allows for a progressive picture to be processed through the same electronic circuitry that is used to store, process and route interlaced video.

The PsF technique is similar to [[Telecine#2:2_pulldown|2:2 pulldown]], which is widely used in 50  Hz television systems to broadcast progressive material recorded at 25 frame/s, but is rarely used in 60  Hz systems. The 2:2 pulldown scheme had originally been designed for interlaced displays, so fine vertical details are usually filtered out to minimize ''[[interline twitter]]''. PsF has been designed for transporting progressive content and therefore does not employ such filtering.

The term ''progressive segmented frame'' is used predominantly in relation to [[high-definition video|high definition]] video. In the world of [[standard definition]] video, which traditionally have been using interlaced scanning, it is also known as ''quasi-interlace''<ref name="POYNTON_DVANDHDTV_P62">{{cite webbook|url=http://books.google.com/books?id=ra1lcAwgvq4C&pg=RA1-PA62&sig=8ZAl0RqzUYnyxQSmjxiIw4ZJDbE|title=Charles Poynton, Digital Video and HDTV: Algorithms and Interfaces}}</ref> or ''progressive recording''.<ref name="DCR-HC36/HC46/HC96 OG PR">{{cite web|url=http://www.docs.sony.com/release/DCRHC36-46-96.pdf |title=DCR-HC36/HC46/HC96 Operating Guide |publisher=Sony Corporation |dateyear=2006 |accessdate=2010-08-11}}</ref>.

== History ==

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* '''24PsF''' (48sF, 1080sf24, 1920x1080/24/1:1SF) is the original PsF format, which is used in professional equipment for film-to-video transfer, for high definition mastering and for video exchange between networks. This may be the first universal video standard which transcends continental boundaries, an area previously reserved for film.<ref>{{cite web|url=http://www.filmmaking-careers.com/film-production.html|title=Steve Wiedemann, 24/P HDTV: The Fall of Film Production}}</ref>

* '''25PsF''' (1080sf25, 1920x1080/25/1:1SF) is used in 50&nbsp;Hz systems for production that originates on video and is targeted for television distribution.

* '''29.97PsF''' (1080sf29, 1920x1080/29.97/1:1SF) formats are sometimes used in 60&nbsp;Hz systems for sitcoms and music shows.<ref>{{cite web|url=http://www.avsforum.com/avs-vb/showthread.php?p=13998888#post13998888|title='Beside You in Time' by Nine Inch Nails was encoded as interlaced.}}</ref><ref>{{cite web|url=http://hometheatermag.com/discplayers/sony_bdp-s350_blu-ray_player/|title=Sony BDP-S350 Blu-ray Player review}}</ref> 29.97PsF as well as '''30PsF''' (30p, 1080sf30, 1920x1080/30/1:1SF) formats are gaining popularity as an acquisition format for Web video delivery, because most video hosting web sites cannot stream video with rates higher than 30 frame/s.