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From: feb@cblpe.ATT.COM (Franco Barber)
Newsgroups: comp.sys.amiga
Subject: Re: VCR Info Summary
Message-ID: <658@cblpe.ATT.COM>
Date: Thu, 15-Oct-87 10:30:56 EDT
Article-I.D.: cblpe.658
Posted: Thu Oct 15 10:30:56 1987
Date-Received: Sat, 17-Oct-87 08:59:14 EDT
References: <664@rocky.STANFORD.EDU> <1606@bloom-beacon.MIT.EDU>
Reply-To: feb@cblpe.ATT.COM (55216-Franco Barber)
Organization: AT&T Bell Laboratories - Columbus, Ohio
Lines: 26

In article <1606@bloom-beacon.MIT.EDU> leekil@athena.mit.edu (Lee S Kilpatrick) writes:
>Will a 6-head VCR freeze-frame good enough to digitize?  And what is
>the problem? Why isn't 4-head freeze-frame "good enough to digitize?"

Because most vcr's these days don't display an entire frame while in
'freeze-frame.' They only show one of the two fields that make up
the frame. To fill the blank lines that would otherwise show up
if you were to throw one field away they repeat the same field
twice.

As a result, you are only getting half of your picture when you
freeze frame. Thus the picture looks grainy.

I don't know where those new 'digital effects' vcr's fit into
this mess. They COULD digitize and display both fields, I just
don't know if they do.


oh and by the way: a 6 head vcr is a 4 head vcr with 2 more heads
for hifi sound. It's no different as far as the picture is concerned
than a 4 head vcr.

Franco
-- 
Franco Barber    AT&T Bell Laboratories, Columbus, Ohio
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