[opendtv] Re: Why Europe should choose 720P for HDTV

  • From: Craig Birkmaier <craig@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Mon, 13 Dec 2004 10:34:17 -0500

At 9:02 AM -0600 12/13/04, Doug McDonald wrote:
>For camera-based moving material or static
>computer generated stuff (not Nyquist filtered), that is true.
>I have not seen enough fast motion in 1080@60i to say
>what it looks like. I have seen of course converted 1080@50i
>fast motion and it looked abysmal, terrible, horrible, extremely bad,
>etc., etc., as was discussed. This of course means that Europe
>will not be able to send us sports or other fast motion
>material, unless this problem ... a really terribly hard one ...
>is solved, but the reverse problem (60 -> 50) is not quite so hard.

This is ONLY true for INTERLACED source.

Conversion of 1280 x 720 @ 50P to 1280 x 720 @ 60P or the reverse 
will not be as troublesome, although it is still difficult to predict 
missing temporal info. Motion compensated prediction routines will 
work much better with progressive source than with interlaced source. 
It might be interesting for the Europeans to runs some tests in this 
area; it might open their eyes to improved exports of their content 
to 60Hz countries.

>>  Santa Claus has packed a 26" 16:9 768 line LCD TV
>>  in his sleigh for me this year.
>Then you have the worst of all worlds: a fixed pixel
>device that is not a simple multiple of any TV
>standard (unless somehow you manage to use
>only 720 lines, of course). You cannot use that set
>to test 720p vs 1080i, because it cannot
>display 720p native unless you don't use 48 lines.
>Doug McDonald

These displays typically do not use the additional 48 lines for 16:9 
source, since the display is not exactly 16:9, but rather closer to 

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