[sane-devel] SANE2 standard completion
rene at exactcode.de
Fri Mar 28 18:14:48 UTC 2008
On 28.03.2008, at 19:02, Alessandro Zummo wrote:
> On Fri, 28 Mar 2008 15:49:17 +0100
> Rene Rebe <rene at exactcode.de> wrote:
>> Right now the only thing I miss are marks for infra-red frames, and
>> a ability to pass duplex data without buffering the rear side, which
>> even more of a problem with the next generation, higher end devices I
> I'm interested in this.. you receive the data of two pages at
> the same time? It's interleaved in some way?
I speak about the duplex devices here, which have 2 CCDs (or
similar and scan both sides at the same time (long supported by
the Avision backend, btw. :-)
Avision developed several ways to transfer the duplex data (aside
from the few, trivial) paper flipping devices with just a single CCD),
for some they buffer the page in-memory inside the scanner, for newer
ones there are several interlaced variants.
For the interlaced variants I so far buffer the rear stripes in the
and return the backed data every second frame.
Probably the fujitsu backend does something similar.
René Rebe - ExactCODE GmbH - Europe, Germany, Berlin
Geschäftsführer: Susanne Klaus, René Rebe
Sitz: Berlin, Amtsgericht Charlottenburg HRB 105 123 B
http://exactcode.de | http://t2-project.org | http://rene.rebe.name
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