On Sat, 29 Jul 2000 CLASSICCMP(a)trailing-edge.com wrote:
As to the quantities, there seem to be about 250 fiche sheets in a one-inch
stack, and my stack is about 18" high. That's 250*18=4500 pieces of fiche.
And each piece of fiche is somewhere between 50 and 200 printed pages of text;
that's about 450 thousand printed pages, by my calculations, using an average
of 100 printed pages per fiche.
Hmm... My previous estimate was wrong, I must have close to 10000
fiche...
I was thinking (I could be wrong) that a scanner could
take in the whole
4" x 5" microfilm sheet at once, and then I could write some software that
would
parse the whole-sheet image into frames, do some automatic cleanup on each
individual frame, and compress. Am I walking down the wrong path?
The problem with this is the size of the imager... A 4" wide scan bar
at 10000 DPI (probably low) is 40,000 pixels. Most modern scanners have
a 8" wide scan bar (element) at 600 DPI (real optical resolution)
thats only 4800 pixels. So even with magnification, the scanner
elements aren't big enough...
I have contemplated building a contraption (enlarger) that would
focus 1/15 or 1/20 of the fiche onto a translucent screen, and
scanning that. Unfortunately, as Chuck(?) pointed out, the mind-
numbing task of repositioning and refocusing for each fiche is
out of the question.
On the topic of drum scanners, will they read a semi-transparent
item such as a fiche? The only one I have ever seen was on TV,
and they were coping one dollar bills to show how easy it was
with high end technology...
clint