[opendtv] Re: Why Europe should choose 720P for HDTV
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 11 Dec 2004 11:19:47 -0500
Tom McMahon wrote:
> When I was at Microsoft, I funded John to write a paper on this very
subject in order to clarify and lend credibility to the issues
> that Mark and John describe.
If that paper was by any chance this one
( http://www.microsoft.com/whdc/archive/convrg1.mspx ) then I thank you,
as it formed the basis for my own belief that capture, transmission, and
display resolutions should best be 3 different sizes. I've been linking
to it on my web site for years.
Not withstanding, I've since started to see both the theoretical and
obvious real life benefits of interlace and have changed my mind a bit
about that issue. I'm not so sure that each successive frame should
represent samples from the same location, which is what 'progressive' is
all about.
- Tom
> When I was at Microsoft, I funded John to write a paper on this very subject
> in order to clarify and lend credibility to the issues
> that Mark and John describe. The media PC was a glint in our eye at the time
> but the principal facts were intact even then.
>
> The principal facts remain intact. Of course, certain companies would prefer
> that this information would be disappeared so that
> they can continue to ship existing inventory....
>
> - Tom McMahon
>
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
> Behalf Of Mark Schubin
> Sent: Saturday, December 11, 2004 7:12 AM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: Why Europe should choose 720P for HDTV
>
> Doug McDonald wrote:
>
>
>>Discrete pixel displays change things.
>>
>
> They do, but not always in beneficial ways.
>
> If we knew that every display was 1920 x 1080 -- or any other fixed set of
> numbers -- we could optimize camera, processing, and
> transmission parameters to match those displays. But we have no such
> situation.
> There are 1024 x 1024 displays, 1366 x 768, and others, in addition to
> 720p's 1280 x 720.
>
> Consider the unique case of 1920 alternating black and white vertical lines
> (960 of each). In theory, they can be displayed on a
> discrete-pixel display with 1920 pixels across. Now shift them 1/2 pixel
> horizontally. The result is all grey.
>
> If we knew that every TV set would have 1920 pixels across, we could make
> sure such a half-pixel horizontal shift would never occur.
> But with multiple resolutions, there will be scaling, and scaling can
> effectively shift everything out of the discrete-pixel grid.
>
> Consider this. Which has more resolution? A 440-line NTSC broadcast or an
> 852-pixel-wide plasma panel? Due to the pixel-shift
> phenomenon, the 852-pixel display can only display half as many TV lines of
> resolution as pixels with a guarantee that they will be
> actually black and white.
> That's 426, slightly less than broadcast NTSC resolution.
>
> I think that's what John Watkinson was driving at.
>
> He may wear funny clothes and hurl hilarious insults, but the author of The
> Art of Digital Video is not unaware of discrete-pixel
> displays.
>
> TTFN,
> Mark
>
>
>
>
>
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