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69 wiersze
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<!-- name="becka@rz.uni-duesseldorf.de" -->
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<!-- subject="Re: Mustek 1200SP: Missing Lines" -->
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<title>sane-devel: Re: Mustek 1200SP: Missing Lines</title>
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<h1>Re: Mustek 1200SP: Missing Lines</h1>
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<a href="mailto:becka@rz.uni-duesseldorf.de"><i>becka@rz.uni-duesseldorf.de</i></a><br>
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<i>Mon, 3 Nov 1997 11:27:08 +0100 (MET)</i>
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<p>
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<li> <b>Messages sorted by:</b> <a href="date.html#23">[ date ]</a><a href="index.html#23">[ thread ]</a><a href="subject.html#23">[ subject ]</a><a href="author.html#23">[ author ]</a>
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<li> <b>Next message:</b> <a href="0024.html">becka@rz.uni-duesseldorf.de: "Re: Mustek 1200SP: Missing Lines"</a>
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<li> <b>Previous message:</b> <a href="0022.html">David Banz: "sane 0.66 bug report"</a>
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<i>> - what happens at different resoultions ? I only see the effect at medium </i><br>
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<i>> resolutions of about 70-150 dpi. Higher resolutions are probably too slow moving</i><br>
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<i>> or the effect it not visible enough and at lower ones, I ususally have no </i><br>
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<i>> or only few boundaries.</i><br>
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<p>
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I just re-checked. They are there even for 300dpi, but usually only 1-2 lines <br>
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are duplicated. The duplication is not exeact, as one can easily check by <br>
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using some image manipulation tools that allows for custom filters.<br>
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<p>
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I tried a horizontal simple edge-detect (-1*last_line+1*current_line ) and <br>
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it shows black stripes at the buffer boundaries. However they are not exactly <br>
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black, but contain brightness values of up to about 6.<br>
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<p>
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This leads to the conclusion, that it is not a problem with SANE buffering or<br>
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the like, as this would probably result in perfect duplication.<br>
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<p>
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However the overall geometry of the image is _not_ distorted as far as I can <br>
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tell. It just looks like you took the correct picture, selected a line and <br>
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copied it over the one below.<br>
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<p>
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So it doesn't sound like a mechanical problem either, leaving open as the <br>
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most probable cause some timing related issue.<br>
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<p>
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Maybe we should try dropping a few sleep()s in at various places and see if <br>
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it changes anything ...<br>
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<p>
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CU,ANdy<br>
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<p>
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<pre>
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--
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Andreas Beck | Email : <<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de">becka@sunserver1.rz.uni-duesseldorf.de</a>>
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======== GGI - The Right Thing To Do : <a href="http://synergy.foo.net/~ggi/">http://synergy.foo.net/~ggi/</a> ========
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<p>
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<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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</pre>
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<p>
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<ul>
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<li> <b>Next message:</b> <a href="0024.html">becka@rz.uni-duesseldorf.de: "Re: Mustek 1200SP: Missing Lines"</a>
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<li> <b>Previous message:</b> <a href="0022.html">David Banz: "sane 0.66 bug report"</a>
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