Progressive segmented frame: Difference between revisions

Revision as of 21:29, 21 September 2011

Revision as of 16:50, 23 September 2011

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PsF has been recognized by [[Rec._709#Frame_rate|Recommendation ITU-R BT.709]] as a legitimate way to transport progressive frames within an interlaced system. 25PsF and 30PsF rates have been added to the specification in addition to the more established 24PsF. "Fractional" frame rates, having the above values divided by 1.001, are also permitted; the resulting 23.976PsF and 29.97PsF rates are used in 60 Hz systems.

PsF became a means of initial image acquisition in professional Sony video cameras. It is employed in [[HDCAM]] and [[XDCAM]] video cameras, including the HDW-F900 [[CineAlta]] camera which was used by [[George Lucas]] for creating [[Star Wars Episode II: Attack of the Clones|Star Wars, Episode 2]], and by [[Alexander Sokurov]] for creating [[Russian Ark]] fully in the digital ___domain.

PsF is utilized in some [[DV]], [[HDV]] and [[AVCHD]] camcorders for 25-frame/s and 30-frame/s progressive-scan recording, and can be called ''Progressive recording'' (Sony), ''Progressive scan mode'' (Sony), ''Frame mode'' (Panasonic and Canon), ''Digital Cinema mode'' (Panasonic) or ''Cinema mode'' (Canon). Consumer and many professional camcorders do not use PsF to record 24-frame/s video; instead they either record it natively in progressive form or apply [[Telecine#23pulldown|2:3 pulldown]].

The operating guide for a 60 Hz ("NTSC") Sony DCR-HC96 camcorder describes the progressive recording mode as follows:

For most all professional video camcorders, recorders and HD Cine cameras, when they say 24p, 25p, 29.97p or 30p, they actually mean 23.98PsF, 25PsF, 29.97PsF or 30PsF. With the exception, of course, of the RED Epic, that says it outputs 1080/23.98p and it outputs 1080/23.98p. This discrepancy in progressive timing and format may not disrupt a mid-to-lower consumer grade monitor but may very much create a signal a professional video recorder cannot read properly.

{{quotation|'''Note on the progressive recording mode'''<br/><br/>In a normal TV broadcast, the screen is divided into 2 finer fields and these are displayed in turn, every 1/60 of a second. Thus, the actual picture displayed in an instant covers only half of the apparent picture area. In progressive recording, the picture is fully displayed with all the pixels.|<ref name="DCR-HC36/HC46/HC96 OG PR"/>}}