[opendtv] Re: Interlace Artifacts
- From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 11 Jan 2005 10:52:01 -0500
>
>
>Let's set the record straight for once and for all.
>
>The actual resolution - i.e. the number of pixels/samples in the
>raster - is related to ONLY one thing:
>
>The ability to display a sharp TV picture on a screen of a given
>size, at a defined viewing distance.
>
Actually, you have two different concepts in there. "Sharpness" is
proportional to the square of the area under a curve mapping contrast
ratio against resolution.
>The ONLY argument that favors interlace - one that is now irrelevant
>because of the use of digital compression techniques - is that you
>can sacrifice some spatial resolution for improved temporal
>resolution.
>
Well, not necessarily the ONLY one. Interlace can make scanning lines
stand out. That can create a "self-sharpening" effect, similar to the
black surrounds added to picture tubes to make them look "sharper"
without increasing their resolution.
TTFN,
Mark
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