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Re: "True", "True" (H)DTV....and the relation to 720/60P Display Syst ems
- To: "INTERNET:telecine at sun.alegria.com" <telecine at sun.alegria.com>
- Subject: Re: "True", "True" (H)DTV....and the relation to 720/60P Display Syst ems
- From: Mike <100745.1141 at compuserve.com>
- Date: Mon, 13 Oct 1997 13:54:23 -0400
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- Resent-Date: Mon, 13 Oct 1997 10:58:26 -0700 (PDT)
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Phil Bennett (X-Abekas) wrote;
"Sorry Howard but this isn't quite true. The interlaced resolution is
than 540 lines. You may want to take a look for info on Kell Factor which
gives the perceived resolution. A value of 0.7 is normally used. This is
whole reason for using interlace in the first place."
Ähum...got another opinion - the prime reason for using a (sorry) scheme
like interlace is that it is analog compression. Well, I am not ungrateful,
interlace has done the job for a long time know but lets face it, its a
retireee. But pleeease let things progress and not carry old and several
times learned lessons through to ther next generation.
Kell factor? Could we not just agree here and now not to mention thisThing
What I mean is that its about time its validity was questioned as its some
time ago it was conceived and we "look" at images quite differently today.
With digital TV (with or without H) , interlace has no purpose. In fact, it
just complicates the issue.
In MPEG, 3-dimensional compression is required, not 1- dimensional as
interlace is. In addition, the "computerworld" has a problem understanding
the purpose of interlace, logically.
Likewise, interlace has no purpose in production and postproduction either.
For hardware manufacturers neither is interlace an issue, both could be
supported without difficulty if uniformly applied (de-interlacing requirers
some skill) throughout the signal chain.
Thought I would get this offladed...
Thanks to Dave Best & Post Perfect for support of the TIG in 1997
HDTV discussion thread is at http://www.alegria.com/telecine/hdtv.txt
TIG subscriber count is 872 on Mon Oct 13 10:58:19 PDT 1997
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