Microfiche scanning

[Pete Turnbull]

On Apr 22 2005,  8:01, der Mouse wrote:
> >>> You don't need the ['fiche viewer] 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.
> >> Pointing the scanner at the plane in space that happens to be the
> >> viewing plane of the fiche viewer isn't going to result in an
image.
> > It doesn't make any difference to the focussing of the scanner
optics
> > whether it's seeing an image produced by light reflected from a
> > plane, or light from some other source producing an image in that
> > same plane.
>
> Ah, but it does.

Well, yes and no.  I was actually thinking of the image produced in a
microscope, which *is* different.  Still, if you could put the scanner
sensor in the same plane as the viewing screen was supposed to be,
you'd form the right sort of image on the sensor.  The sensor width
would of course need to be the same as the screen width, and would need
to not have any optics.  I haven't looked at a scanner sensor for a
long time so I don't know if that's possible.  It probably isn't.


-- 
Pete						Peter Turnbull
						Network Manager
						University of York