[opendtv] Re: Why Europe should choose 720P for HDTV
- From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 11 Dec 2004 16:22:56 -0500
Tom Barry wrote:
>How much do you have to filter so that an image can move smoothly across
>or down a fixed pixel display 1/2 pixel at a time without aperture
>effect artifacts. Is it just to the Nyquist limit, or more?
>
>
Nyquist applies to ongoing signals. If Nyquist were to apply to
displays, they would already be practically at the Nyquist limit. 1919
alternating black and white lines (just under 960 of each) in 1920
pixels would satisfy Nyquist, if it applied. But fixed displays are not
ongoing signals.
The better model is Kell, and just as Kell, himself, said there would be
dispute over his factor, there is dispute over the filtering required.
TTFN,
Mark
>
>
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