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<TITLE>sane-devel: Calibration algorithms</TITLE>
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<META NAME="Author" CONTENT="Glenn Ramsey (glenn@componic.com)">
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<META NAME="Subject" CONTENT="Calibration algorithms">
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<H1>Calibration algorithms</H1>
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<!-- subject="Calibration algorithms" -->
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<!-- id="3B085D90.E47B72AF@goata.nz.componic.com" -->
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<STRONG>From:</STRONG> Glenn Ramsey (<A HREF="mailto:glenn@componic.com?Subject=Re:%20Calibration%20algorithms&In-Reply-To=<3B085D90.E47B72AF@goata.nz.componic.com>"><EM>glenn@componic.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun May 20 2001 - 17:13:04 PDT
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0274.html">Henning Meier-Geinitz: "Re: Calibration algorithms"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0274.html">Henning Meier-Geinitz: "Re: Calibration algorithms"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0281.html">Karsten Festag: "Re: Calibration algorithms"</A>
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Hi,
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<BR>
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<P>When we make a scan on the Microtek Scanmaker 3600 the brightness
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<BR>
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of the resulting image is uneven, being darker at the left and
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<BR>
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right edges and lighter in the centre. Scans made using scanwizard
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<BR>
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under windows do not show this unevenness.
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<BR>
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<P>I have tried to find evidence in the usb snoopy logs of parameters
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<BR>
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being set to compensate for this but there don't seem to be any.
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<BR>
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Also the backend currently makes scans by pretty much just
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<BR>
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reproducing the command stream that scanwizard makes so I strongly
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<BR>
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suspect that the compensation is done in software.
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<BR>
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<P>The inside of the scanner cover has, in front of the scan area, 3
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<BR>
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black dots, spaced at 2in apart, and a white strip which is as
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<BR>
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wide as the scan area. Scanwizard appears to make scans of this
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<BR>
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area before it does the first scan after starting up and sometimes
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<BR>
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when parameters are changed. There is a photo of the strip and
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<BR>
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dots at <A HREF="http://sm3600.sourceforge.net/calstrip.jpeg">http://sm3600.sourceforge.net/calstrip.jpeg</A> .
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<BR>
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<P>I guess the sm3600 backend also needs to use the dots and white
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<BR>
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strip to do some sort of compensation.
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<BR>
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<P>Does anyone have any references that discuss how this is done or
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<BR>
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do any of the other backends have code that does this? Any help
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<BR>
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would be greatly appreciated.
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<BR>
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<P>BTW if you want to try out the backend we have released a patch
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<BR>
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against sane 1.0.4 at our sourceforge project page:
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<BR>
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<A HREF="http://sourceforge.net/projects/sm3600">http://sourceforge.net/projects/sm3600</A> .
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<BR>
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<P>Thanks
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<BR>
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g
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<BR>
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<P><PRE>
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--
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Glenn Ramsey
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<A HREF="mailto:glenn@componic.com?Subject=Re:%20Calibration%20algorithms&In-Reply-To=<3B085D90.E47B72AF@goata.nz.componic.com>">glenn@componic.com</A>
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<P>--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Calibration%20algorithms&In-Reply-To=<3B085D90.E47B72AF@goata.nz.componic.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0262.html">Scott Gifford: "Re: how to write a manpage"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0274.html">Henning Meier-Geinitz: "Re: Calibration algorithms"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0274.html">Henning Meier-Geinitz: "Re: Calibration algorithms"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0281.html">Karsten Festag: "Re: Calibration algorithms"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sun May 20 2001 - 17:14:25 PDT</EM>
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