Microfiche scanning

[Pete Turnbull]

On Apr 21 2005, 16:50, Jim Leonard wrote:
> Pete Turnbull wrote:
> > Um, your maths is off.  Assuming 150 dpi is the minimum acceptable
for
> > well-printed text (and some DEC fiche is anything but), and a page
is
> > 8" wide, you need 1200 dots per page width.  A page width on the
fiche
> > you describe is 6/16 inches, so you need 16/6 * 1200 dots per inch,
> > which is 3192 dpi.
>
> My apologies.  Still, 4800 optical scanners are $600 or less, so I
still
> consider it possible.

I won't argue with that.  Another thing that occurs to me is that one
could presumably build something like a fiche viewer over the scanner
glass; somthing to hold the fiche against a lens and project a
magnified image onto the scanner glass.  I assume that, in essence, is
how Al's big fiche scanner works.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York