[opendtv] Re: HD vs. 625 vs. 525 vs. 405
- From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 28 Aug 2004 12:09:50 -0400
Terry Harvey wrote:
>The definition of Kell Factor is the number obtained by dividing the raster
>pitch distance by the width of the picture resolution elements.
>
No, it is not. The common definition of the Kell factor is the
reduction in vertical resolution from the number of scanning lines
(although, in the age of fixed-pixel displays, it has also been applied
to the reduction in hirizontal resolution from the number of active
samples per line).
>Recall that system A was developed in 1935/36, before Kell and others
>discovered that the interlaced vertical resolution was not ideal.
>
Kell did his work in the early 1930s, before System A was broadcast.
I have extensively researched Kell's work. I would suggest that you
look up the Proceedings of the IRE.
TTFN,
Mark
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