On Sat, 27 Apr 2002 08:27:46 GMT, "Gunnar Thalin"
>"Neuman - Ruether"
>news:3cc95089.1696897@newsstand.cit.cornell.edu...
>> - PS-mode/"frame-mode" operates at 30fps for Canon cameras,
>> 15fps for Sony, but the Canon interpolates fields to get
>> the higher frame rate, reducing spatial resolution (which
>> in any case cannot be greater than it is for interlaced
>> video...)
>Slightly incorrect. Motion is recorded at higher spatial
>(but lower temporal) resolution in progressive mode than in
>interlaced mode. Static video is the same for both modes.
And where does that extra spatial resolution come from...?
Sorry, you cannot exceed within a frame the resolution
provided by the interlaced video, unless you are talking
about stills and proper time alignment of the fields for
these - but for motion, as I said, there cannot be increased
spatial resolution with PS mode...
>And where on earth did you hear that Canon cameras interpolate
>the fields? I just got my Canon MV30i (European version of Optura Pi)
>yesterday, and you really scared me for a while.
>But I just made some tests, and I can assure you you're wrong;
>it does NOT interpolate the fields. Not spatially and not
>temporally.
Check out www.adamwilt.com for more on this - the Canons
do reduce spatial resolution to provide full 30fps (NTSC)
frame rate in PS-mode. So far, they cannot give full
30fps (or 25fps PAL) and maintain full frame resolution
(relatively poor as that is, in any case...;-). Which is why
Sony PS-mode is at 1/2 the normal frame rate, to maintain
full resolution for stills...
>> - Since most TVs are interlaced displays, using PS-mode for
>> these is generally inappropriate, though some people
>> appear to like the resultant "flicker" for reasons totally
>> mysterious to me...;-)
>
>Not all people watch their video on 50/60Hz TV's.
>On a computer monitor, for example, I definitely prefer
>progressive scan video.
Yes - but this is the "minority" mode for video-watching...
>And if you want to make a DivX movie you should know that
>DivX doesn't even support interlaced video (yet).
>But sure, on a 50/60Hz TV I prefer interlaced video too.