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
apertures.

	paul




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