sorry it has taken almost a month to respond, but i have
just been
donated a small scanner, and am writing a sane backend for
it. it is
only a 4 inch (10+ cm) ccd, and it seems to only scan at 300
dpi, but
the commands seem very simple, and it is capable of scanning
without
moving the feed motor. it is the CardScan 800c, part of the
'Executive
v8' package. it is an adf scanner, so you would have to
remove the
read-head.
perhaps it is too much work for you, but let me know if you
are
interested, and i can try to give more details.
allan
On 3/25/07, netbox pi-xi.net <netboxpi-xi.net> wrote:
> Hello,
>
> I'm in a need for a scanner for rather special purpose,
in which
> features such as:
>
> - freedom to control the step motors
> - turn the led lamps off during scan (if not, i'll just
disconnect them)
> - vary ccd gain and gamma for channels individually (i
noticed that
> the canoscan lide 25 driver had this feature)
> - ability to scan without the scanner head moving (work
as a buffered
> streaming ccd camera)
> - only powered via usb (no external power required)
> - least autonomy and be most dependent on the software
for best
> programmability
> - control scanner focus (though i assume that with
cheap scanners the
> focus is propably preset at the distance of the scanner
glass from the
> ccd surface, this is actually even better)
>
> In other words, the scanner would act as a digital
scanning back for a
> certain technical photography purpose.
>
> The scanner will be scanning the "film plane"
surface at slow speeds
> and doing multiple scans for the same rows to increase
SNR ratio
> (blending multiple "exposures" together with
software that i'm writing).
>
> I'm just curious if these scanners are generally able
to "stream" the
> image data in for example simple raw data via the usb
or are they so
> autonomic that they always perform a scan within the
set range and
> output a jpeg/whatever with all the header information
via the usb
> after they are finished?
>
> And to the questions regarding: why not just use ccd? -
I have access
> to a couple of digital backs but they are not an
optimal solution
> simply because they output huge amounts of data at a
time. I need only
> lots of data from a certain area of the film plane at a
time. A 1 axis
> ccd row seemed like an optimal solution given that it
can output far
> better resolution than any dv-camera or similar
equipment. Also, there
> are some special lens requirements. So far the plan has
been to hook
> the scanning back to a Mamiya RZ67, which provides an
adequate
> scanning area of 6x7cm.
>
> So, for a prototype, any suggestions of semi-cheap
(<100 eur) scanner
> models which would allow as much control as possible
via current SANE
> backends ? The canoscan lide25 seemed like a good
choice for starters,
> but since my experience is restricted to film scanners,
i have very
> little knowledge of modern consumer flatbeds.
>
> Also, i'm looking for doing most of the job in software
via a hooked
> laptop which powers the scanner so that minimal
hardware modifications
> would have to be made, because i'm not keen in
electronics.
>
> Sincerely,
> Otso Helenius
>
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