Microfiche scanning

Paul Koning pkoning at equallogic.com
Fri Apr 22 08:47:12 CDT 2005

>>>>> "John" == John Foust <jfoust at threedee.com> writes:

 John> At 07:21 PM 4/21/2005, you wrote:
 >> You could just remove the fiche viewer screen.  You don't need the
 >> screen to form the image, you only need the (virtual) image from
 >> the viewer's lens system to be focussed in the same plane as the
 >> scanner's optics.  Actually, since the image is usually focussed
 >> on the back surface of the viewer screen, you'd want to remove it
 >> anyway.

 John> Pointing the scanner at the plane in space that happens to be
 John> the viewing plane of the fiche viewer isn't going to result in
 John> an image.  The scanner wants to see reflected light.  Focusing
 John> the fiche projection at the scanner's sensor is a different
 John> sort of problem that would involve changing the scanner's
 John> optics, no?

No.  An image is an image.  There's nothing magical about "reflected
light", it's the same as any other light.

The one issue you might run into is light loss due to mismatched


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