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<TITLE>sane-devel: RE: Scan ahead</TITLE>
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<META NAME="Subject" CONTENT="RE: Scan ahead">
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<H1>RE: Scan ahead</H1>
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<!-- received="Fri Mar 30 12:38:25 2001" -->
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<!-- isoreceived="20010330203825" -->
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<!-- sent="Fri, 30 Mar 2001 15:50:01 -0500" -->
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<!-- isosent="20010330205001" -->
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<!-- name="JFL Sane Dev" -->
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<!-- email="SaneDeveloper@jflinc.com" -->
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<!-- subject="RE: Scan ahead" -->
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<!-- id="2F9F0A691323D5449926C19BEFF988C30A44FF@services2k.jflinc.com" -->
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<!-- inreplyto="Scan ahead" -->
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<STRONG>From:</STRONG> JFL Sane Dev (<A HREF="mailto:SaneDeveloper@jflinc.com?Subject=RE:%20Scan%20ahead&In-Reply-To=<2F9F0A691323D5449926C19BEFF988C30A44FF@services2k.jflinc.com>"><EM>SaneDeveloper@jflinc.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Mar 30 2001 - 12:50:01 PST
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<P>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0252.html">Stephen Williams: "Re: Scan ahead"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0250.html">Peter Kirchgessner: "Re: Scan ahead"</A>
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<LI><STRONG>Maybe in reply to:</STRONG> <A HREF="0249.html">JFL Sane Dev: "Scan ahead"</A>
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<P>
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Hello Peter,
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<BR>
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<P>Thank you very much for your answer.
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<BR>
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<P>Assuming there are such scanners, what would be the correct SANE command
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<BR>
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sequence?
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<BR>
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<P>Many production scanners do support this feature. Most of these scanners
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<BR>
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scan only B&W and grayscale but not necessarily at low resolutions (it is
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<BR>
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not very uncommon 600 dpi and up). If the scanner scans compressed then the
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<BR>
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amount of memory needed to store an image in the scanner buffer is minimal,
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<BR>
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but scan ahead may be supported also for uncompressed data (how many pages
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<BR>
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is the scanner able to scan before to fill completely the buffer depends on
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<BR>
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the buffer and image size and the speed the application is able to pull out
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<BR>
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images from the buffer). All those scanners when used in page by page scan
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<BR>
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mode (i.e. scan synchronously with the driver/application) are not able
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<BR>
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usually to sustain their maximum scan speed.
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<BR>
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<P>The particular scanner I want to try to scan in scan ahead mode from it
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<BR>
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using SANE is Fujitsu M4099D.
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<BR>
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<P>I am very interested to know the correct SANE command sequence/procedure for
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<BR>
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such a scan-ahead acquisition sequence.
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<BR>
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<P>Thanks,
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<BR>
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Marius
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<BR>
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<P><EM>> -----Original Message-----
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</EM><BR>
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<EM>> From: Peter Kirchgessner [mailto:<A HREF="mailto:peter@kirchgessner.net?Subject=RE:%20Scan%20ahead&In-Reply-To=<2F9F0A691323D5449926C19BEFF988C30A44FF@services2k.jflinc.com>">peter@kirchgessner.net</A>]
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</EM><BR>
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<EM>> Sent: March 30, 2001 3:09 PM
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</EM><BR>
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<EM>> To: <A HREF="mailto:sane-devel@mostang.com?Subject=RE:%20Scan%20ahead&In-Reply-To=<2F9F0A691323D5449926C19BEFF988C30A44FF@services2k.jflinc.com>">sane-devel@mostang.com</A>
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</EM><BR>
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<EM>> Subject: Re: Scan ahead
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Hello Marius,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I dont know a scanner that can store a single frame completely. For an
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</EM><BR>
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<EM>> A4 scan at 600 dpi with 24bit you would need about 100MB of memory.
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</EM><BR>
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<EM>> Maybe this works for b/w scans at low resolution. But in that case I
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</EM><BR>
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<EM>> suppose the scanner will not accept to start a new scan when the image
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</EM><BR>
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<EM>> has not been read completely.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Sincerely
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Peter
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> > JFL Sane Dev wrote:
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Hi,
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > I am a beginner with SANE. Could anyone tell me please how should a
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</EM><BR>
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<EM>> > scan-ahead (automatic scan, the scanner scans asynchronously at
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</EM><BR>
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<EM>> > highest possible speed to its internal memory buffer, the
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</EM><BR>
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<EM>> driver reads
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</EM><BR>
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<EM>> > images at its own speed from the scanner buffer) image acquisition
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</EM><BR>
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<EM>> > sequence be implemented in a SANE session?
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > If the driver starts the scanner in automatic mode at first
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</EM><BR>
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<EM>> sane_start
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</EM><BR>
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<EM>> > it receives, would the application have to not request sane_cancel
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</EM><BR>
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<EM>> > until all images are transferred?
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > If the application would call repeatedly sane_start +
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</EM><BR>
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<EM>> > sane_read_until_SANE_STATUS_EOF for each image, and then call
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</EM><BR>
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<EM>> > sane_cancel when sane_start (or sane_read) returns
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</EM><BR>
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<EM>> > SANE_STATUS_NO_DOCS? Would this be the correct procedure?
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Thanks,
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</EM><BR>
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<EM>> > Marius Niculescu
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> --
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</EM><BR>
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<EM>> Peter Kirchgessner
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</EM><BR>
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<EM>> <A HREF="http://www.kirchgessner.net">http://www.kirchgessner.net</A>
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</EM><BR>
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<EM>> mailto:<A HREF="mailto:peter@kirchgessner.net?Subject=RE:%20Scan%20ahead&In-Reply-To=<2F9F0A691323D5449926C19BEFF988C30A44FF@services2k.jflinc.com>">peter@kirchgessner.net</A>
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> --
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</EM><BR>
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<EM>> Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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</EM><BR>
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<EM>> To unsubscribe: echo unsubscribe sane-devel | mail
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</EM><BR>
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<EM>> <A HREF="mailto:majordomo@mostang.com?Subject=RE:%20Scan%20ahead&In-Reply-To=<2F9F0A691323D5449926C19BEFF988C30A44FF@services2k.jflinc.com>">majordomo@mostang.com</A>
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</EM><BR>
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<EM>>
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</EM><BR>
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<P><P><PRE>
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--
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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:%20Scan%20ahead&In-Reply-To=<2F9F0A691323D5449926C19BEFF988C30A44FF@services2k.jflinc.com>">majordomo@mostang.com</A>
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</PRE>
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<P><!-- body="end" -->
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<HR NOSHADE>
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<UL>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0252.html">Stephen Williams: "Re: Scan ahead"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0250.html">Peter Kirchgessner: "Re: Scan ahead"</A>
|
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<LI><STRONG>Maybe in reply to:</STRONG> <A HREF="0249.html">JFL Sane Dev: "Scan ahead"</A>
|
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<!-- nextthread="start" -->
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<A HREF="author.html#251">[ author ]</A>
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<SMALL>
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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>Fri Mar 30 2001 - 12:39:14 PST</EM>
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</EM>
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