21 Apr
2005
21 Apr
'05
8:21 p.m.
On Apr 21 2005, 18:28, John Foust 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.
Similarly, you don't need to remove the scanner's lamp, except perhaps
to eliminate stray reflections that would cause glare and reduce
contrast. You would just disconnect its power if that were the
requirement.
--
Pete Peter Turnbull
Network Manager
University of York
At 05:14 PM 4/21/2005, Pete Turnbull wrote:
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.
What, no one here has ever tried to bolt a scanner to the
frosted glass face of an ordinary fiche viewer? You'd want to trick
it into not using its own lamp, but that's been done before with
the guy who turned a scanner into a high-res camera. 
21 Apr
21 Apr
8:33 p.m.
Pete wrote:
Similarly, you don't need to remove the
scanner's lamp, except perhaps
to eliminate stray reflections that would cause glare and reduce
contrast. You would just disconnect its power if that were the
requirement.
Many scanners do a calibration on the lamp. Some will refuse to scan if
they think the lamp isn't working correctly.
Eric
22 Apr
22 Apr
12:25 p.m.
Eric Smith wrote:
Pete wrote:
Get a scanner that has the capability of scanning slides.
(Many epson can do this, esp. the Perfection series). They
have a light in the hood, which you can easily disconnect
(simply unplug the hood).
When scanning slides, they do not use the light in the base.
Similarly, you don't need to remove the
scanner's lamp, except perhaps
to eliminate stray reflections that would cause glare and reduce
contrast. You would just disconnect its power if that were the
requirement.
Many scanners do a calibration on the lamp. Some will refuse to scan if
they think the lamp isn't working correctly.
Eric
3:36 p.m.
Kevin wrote:
Get a scanner that has the capability of scanning
slides.
(Many epson can do this, esp. the Perfection series). They
have a light in the hood, which you can easily disconnect
(simply unplug the hood).
When scanning slides, they do not use the light in the base.
But don't they still go through a CCD (or CMOS) sensor calibration
cycle?
26 Apr
26 Apr
8:38 a.m.
Kevin said
Get a scanner that has the capability of scanning
slides.
(Many epson can do this, esp. the Perfection series).
I went back through this thread to see if anyone mentioned this series of
Epson scanners. My model is the Perfection 4870 and I think the current
equivalent is the 4990. They have a full width moving light source in the
lid with a 10x8 scanning area for transparencies (scans a batch of 25 x 35mm
frames unattended) and will do 4800x9600 (optical) if you need it.
I have not scanned fiche, but I have scanned 8mm home movie film frames and
the results are remarkable. If it can handle that, then B&W fiche should be
doable (and faster), and you could batch up quite a few them to scan at
once.
Comes with Abbyy FineReader OCR software which handles just about everything
I have given it - maybe fiche text as well?
Phil
2:58 p.m.
Comes with Abbyy FineReader OCR software which handles
just about
everything I have given it - maybe fiche text as well?
If it's anything like the VMS 'fiche I used back in the '80s, _any_ OCR
software will need human help. Even a human occasionally needed
high-level knowledge like "PUSHQ makes more sense here than PUSHO given
the surrounding code" to make it out.
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21 Apr
21 Apr
10:55 p.m.
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.
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.
The scanner wants to see reflected light. Focusing the fiche
projection at the scanner's sensor is a different sort of problem
that would involve changing the scanner's optics, no?
Similarly, you don't need to remove the
scanner's lamp, except perhaps
to eliminate stray reflections that would cause glare and reduce
contrast. You would just disconnect its power if that were the
requirement.
In an ideal world, you'd want be able to use off-the-shelf scanner
software. Driving the scanner's electronics on your own might
allow you to bypass its checks for the lamp operation.
- John
22 Apr
22 Apr
9:47 a.m.
>>>> "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
7024
days inactive
7028
days old
7 comments
7 participants
participants (7)
-
eric＠brouhaha.com -
guerney＠bigpond.com -
jfoust＠threedee.com -
kth＠srv.net -
mouse＠Rodents.Montreal.QC.CA -
pete＠dunnington.u-net.com -
pkoning＠equallogic.com