[sane-devel] I have achieved ADF duplex scan(m. allan noah)

[eagleskycloud]

>1. are you employed by microtek?

    Yes,I am.
>2. do you know if the 2020s also uses the same protocol?

   I don't know the protocol that 2020s use. As far as I know, the 2020s is
different from 4020s in  hardware. If you want to develop the driver of
2020s, you could contact with us.

>3. are you planning to release the driver source for inclusion into SANE?

  It is determined by our leader Whether we release the driver source for
inclusion into SANE.


---------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 18 Jun 2008 09:59:42 -0400
> From: "m. allan noah" <kitno455 at gmail.com>
> Subject: Re: [sane-devel] I have achieved ADF duplex scan
> To: eagleskycloud <eagleskycloud at gmail.com>
> Cc: sane-devel at lists.alioth.debian.org
> Message-ID:
>        <97246d0e0806180659o10719028k72e04d5bc3cb9836 at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> nice work- i have a few questions:
>
> 1. are you employed by microtek?
> 2. do you know if the 2020s also uses the same protocol?
> 3. are you planning to release the driver source for inclusion into SANE?
>
> allan
>
> 2008/6/17 eagleskycloud <eagleskycloud at gmail.com>:
> >
> > Hi ,
> >
> > With your help,I have achieved duplex ADF scan in our backend with
> > sane-backends 1.0.19 and XSane 0.995. Xsane could get front image and
> back
> > image of a paper at the same time while scanning with ADF.
> >
> >    I save back image in a buffer allocated by my backends  then Xsane
>  read
> > a back image  after XSane have get a whole front image.
> >
> >    Below suggestion is from m. allan noah:
> >
> > 1. from the frontend perspective, duplex is no different from simplex
> > adf, there are just more images.
> >
> > 2. i have never gotten xsane's multi-page mode to work, i use
> > 'scanimage -b' or 'scanadf' command line tools
> >
> > 3. there are several other backends which support duplex scans.
> > fujitsu, avision, epjitsu come to mind. You could look at their code
> > for suggestions, but then your code becomes a derivative work, and you
> > must release it also under the GPL.
> >
> > 4. The way to write your code depends on the scanner. If the scanner
> > has enough memory to buffer the back side data until after the
> > front-side has been read, then you just read them sequentially. if the
> > scanner sends back the data interlaced, then you must buffer the back
> > side in memory until the front side has been sent to front-end, then
> > read back side from buffer. the fujitsu backend demonstrates both of
> > these.
> >
> > 5. be aware that a proper front-end in batch mode will call
> > sane_start() at the beginning of each page, but only call sane_cancel
> > after the last page returns SANE_STATUS_NO_DOCS.
> > ...
> >
> > Thank you.
> >
> >
> > --
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> >
>
>
>
> --
> "The truth is an offense, but not a sin"
>
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