[sane-devel] Could XSane process the threshold while lineArt scan?

[eagleskycloud]

My driver process the threshold  at present .  If  the value of  pixel
greater than the threshold ,the value of pixel is set 255. Otherwise the
value of pixel is set 0.

2008/6/23 m. allan noah <kitno455 at gmail.com>:

> On 6/23/08, Daniel Glöckner <daniel-gl at gmx.net> wrote:
> > On Mon, Jun 23, 2008 at 05:04:57PM +0800, eagleskycloud wrote:
> >  >      My driver process threshold while lineArt scan now. If XSane
> could
> >  > process threshold, my driver would get simple.
> >
> >
> > IMHO lineArt should be advertised only for devices that can do the
> >  conversion in hardware. Doing it in hardware has the benefit of reduced
> >  USB/SCSI bandwidth. Drivers should not cover up for cheap hardware.
> >
> >  There is a list of planned features for XSane.
> >
> >  http://www.xsane.org/xsane-future.html
> >
> >  If you want lineArt conversion to be included there, you need to contact
> >  the author. He is no longer on this mailing list.
>
> this is a place where i disagree with daniel, for two reasons-
>
> 1. It would still help with bandwidth in the net backend case, which
> sould like it might become the standard in some future version of
> sane.
>
> 2. it is good if all backends present a similar interface, so that
> front-ends like scanimage can still have access to these functions.
>
>  to that end- i have been working on a sanei_threshold library that
> backends of dumb scanners could share. it still has the same effect of
> code only in one place. i need a good algorithm though- eagleskycloud-
> what mechanism were you planning to use? straight threshold, or
> something adaptive?
>
> allan
> --
> "The truth is an offense, but not a sin"
>
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