PSF VERSUS P

[Vincent Rice]

As I understand it Psf (progressive, segmented frame) is interlaced but the two fields are exactly the same, like watching a movie on a CRT. (in PAL terms anyway). It saves bandwidth and I don’t believe there is any visual difference.

[Barry Green]

No the fields aren’t the same — if they were, it’d be de-interlaced video, not progressive.

PsF is Sony’s way of recording a progressive-scan image to an interlaced tape system. They segment the frame into fields and record them as fields. With PsF they run the tape slower through the camera, so it’s basically a 50i recording that’s slowed down so it records 48 fields instead of 50. However, the image data is from a genuine, pure progressive frame… there’s nothing interlaced about the original image. It just gets split into two fields for recording purposes, and can be reconstituted into a progressive frame when editing.

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[Vincent Rice]

That’s what I meant actually. Of course the original image is progressive, there would be no point otherwise, but when it is played out there are two identical* fields non? Not one progressive frame. That’s why it has a different nomenclature. Once its in an NLE it doesn’t matter.

* I mean that they are temporally identical, not duplicated and shifted.

[Barry Green]

Saying the fields are identical implies that field one and field two contain the same data, which is of course not how it works. The fields were captured at the same moment in time (as opposed to interlace capture, where they’re captured 1/60 of a second apart from each other). But the data they contain is entirely different from each other — if they were identical, you’d just have low-resolution video (like CineFrame 25 and CineFrame 30). That’s the difference from true progressive — progressive offers a full high-resolution frame (whether it’s recorded as fields or not), whereas duplicating fields offers lower-resolution footage that offers the same temporal feel as progressive, but is, inherently, lower resolution.

—————–
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[Vincent Rice]

Er, yes I know that Barry…I’m obviously not expressing myself very well.

[David Massachi]

So, going back to original question:

what is the exact difference beetween the way the hvx will have progressive image and the way sony do in 750 and 900 camera their psf mode?
for film and for video

massachi