[sane-devel] Art project
m. allan noah
kitno455 at gmail.com
Sat Jul 10 20:02:28 UTC 2010
Modifying the hardware is the easy part.
The problem here is that many scanner chipsets don't understand the
idea of longer length scanning. They have one or more internal
registers that hold the length of the scanned area and/or the length
of the scanner bed, so that the motor can slow and stop before
striking the end of the bed. Most machines don't give the programmer
access to those registers.
I think what you need is either an ADF machine with long-scanning
support (which you have to convert into a flatbed), or a very stupid
flatbed which relies upon the driver to detect the end of the bed.
The cardscan 800c is a combination of those two ideas, a very dumb ADF
machine. But, it is very narrow.
On Sat, Jul 10, 2010 at 2:36 PM, Mark Van den Borre
<mark+sane at markvdb.be> wrote:
> I am not a sane developer, but I wonder if you have considered
> sheetfed scanners like the Xerox Travel Scanner 100? One can make
> these scan never ending lengths of paper.
> sane user
> 2010/7/10 karim moreau <karimmoreau at gmail.com>:
>> I'm currently working on an artistic project and am looking for someone with
>> technical knowledge (developer, engineer,…) to help me with advice and / or
>> Basically, what I am trying to do is to modify a desktop scanner so as to
>> significantly increase the size of the scanning surface.
>> See figure here : http://www.upian.net/schema.jpg
>> What I want to do is, starting with a basic A4 or A3 scanner, to cut it and
>> increase substantially the scanning surface "B" of the scanner.
>> For instance, an A4 scanner uses a 21cm wide sensor that can scan a 29,7cm
>> long surface, from point "p1" to point "p2"
>> The idea is to cut the scanner and to increase its length in order to allow
>> him to scan a significantly longer surface, up to a point "p3" that could be
>> 2m from point "p1".
>> The material aspect of that project isn't going to be a problem for me. But
>> what I need help for is the software part of the problem : for the driver of
>> the scanner has to be partially rewritten or modified so as to allow the
>> tracks of the scan to run all the way through (point "p3") but also to
>> produce an image that has the new proportions of the scanner.
>> Depending on what you are advising, I'm also ready to invest in a specific
>> model, if you think the driver of that specific scanner is going to be
>> easier to reprogram / modify.
>> Thank you very much for any input, advice or help : I'd really like to be
>> able to pull this through, so please do not hesitate to share any thoughts
>> you have on this, wether you think this is doable or not.
>> Karim Moreau
>> 76 rue de la jonquiere
>> 75017 paris
>> 06 22 18 91 55
>> karimmoreau at gmail.com
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