<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div></div><div><br><div><div>On Nov 14, 2009, at 10:07 PM, Lassi Paavolainen wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi,<br><br>I'm not Luca, but this filter works as basic OtsuThresholdImageFilter with a one difference that it is able to divide intensities to multiple classes, not just to two classes. Number of classes+1 can be set using SetNumberOfThresholds method. Output of the filter is label image where pixels of class 1 are marked as 0, pixels of class 2 marked as 1 and so on.<br><br>There is lots of information about Otsu available. One place to start is Wikipedia (<a href="http://en.wikipedia.org/wiki/Otsu's_method">http://en.wikipedia.org/wiki/Otsu's_method</a>) which includes a reference to original paper by Otsu and also a reference to paper where different thresholding methods are compared.<br><br>Lassi<br><br>On Sat, 14 Nov 2009, Bill Lorensen wrote:<br><br><blockquote type="cite">Roman,<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">This class was contributed by Luca Antiga. Perhaps he can provide you<br></blockquote><blockquote type="cite">with a reference.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Bill<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">On Sat, Nov 14, 2009 at 6:39 AM, Roman Grothausmann<br></blockquote><blockquote type="cite"><<a href="mailto:roman.grothausmann@helmholtz-berlin.de">roman.grothausmann@helmholtz-berlin.de</a>> wrote:<br></blockquote><blockquote type="cite"><blockquote type="cite">Dear mailing list members,<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I'm looking for filters that generate multiple thresholds/segments (if<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">possible without subjective judgement). I found OtsuMultipleThresholds but<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">cannot find more info on it than in:<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="http://www.itk.org/Doxygen/html/classitk_1_1OtsuMultipleThresholdsImageFilter.html">http://www.itk.org/Doxygen/html/classitk_1_1OtsuMultipleThresholdsImageFilter.html</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Shouldn't there be an insight journal article to any filter? It would be<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">nice if the Doxygen filter descriptions would have a link to the insight<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">journal article for that filter.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Are there any guide lines on what automated multi-threshold filter one<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">should use when?<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Many thanks for any help.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Roman<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">_____________________________________<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Powered by <a href="http://www.kitware.com">www.kitware.com</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Visit other Kitware open-source projects at<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><a href="http://www.kitware.com/opensource/opensource.html">http://www.kitware.com/opensource/opensource.html</a><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Kitware offers ITK Training Courses, for more information visit:<br></blockquote></blockquote><blockquote 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type="cite"><br></blockquote></blockquote><blockquote type="cite">_____________________________________<br></blockquote><blockquote type="cite">Powered by <a href="http://www.kitware.com">www.kitware.com</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Visit other Kitware open-source projects at<br></blockquote><blockquote type="cite"><a href="http://www.kitware.com/opensource/opensource.html">http://www.kitware.com/opensource/opensource.html</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Kitware offers ITK Training Courses, for more information visit:<br></blockquote><blockquote type="cite"><a href="http://www.kitware.com/products/protraining.html">http://www.kitware.com/products/protraining.html</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Please keep messages on-topic and check the ITK FAQ at:<br></blockquote><blockquote type="cite"><a href="http://www.itk.org/Wiki/ITK_FAQ">http://www.itk.org/Wiki/ITK_FAQ</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Follow this link to subscribe/unsubscribe:<br></blockquote><blockquote type="cite"><a href="http://www.itk.org/mailman/listinfo/insight-users">http://www.itk.org/mailman/listinfo/insight-users</a><br></blockquote><blockquote type="cite"><br></blockquote><br>-- <br>Lassi Paavolainen, M.Sc<br>PhD Student in Computer Science<br>University of Jyväskylä<br>Software Engineer<br>BioImageXD (<a href="http://www.bioimagexd.net">http://www.bioimagexd.net</a>)<br><a href="mailto:lassi.paavolainen@jyu.fi_____________________________________">lassi.paavolainen@jyu.fi_____________________________________</a><br>Powered by www.kitware.com<br><br>Visit other Kitware open-source projects at<br>http://www.kitware.com/opensource/opensource.html<br><br>Kitware offers ITK Training Courses, for more information visit:<br>http://www.kitware.com/products/protraining.html<br><br>Please keep messages on-topic and check the ITK FAQ at:<br>http://www.itk.org/Wiki/ITK_FAQ<br><br>Follow this link to subscribe/unsubscribe:<br>http://www.itk.org/mailman/listinfo/insight-users<br></div></blockquote></div><br><div> <span class="Apple-style-span" style="font-size: 12px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>--</div><div>Luca Antiga, PhD</div><div>Head, Medical Imaging Unit,<br>Biomedical Engineering Department,<br>Mario Negri Institute.<br>mail: Villa Camozzi, 24020, Ranica (BG), Italy<br>phone: +39 035 4535-381<br>email: <a href="mailto:antiga@marionegri.it">antiga@marionegri.it</a><br>web: <a href="http://villacamozzi.marionegri.it/~luca">http://villacamozzi.marionegri.it/~luca</a></div></div></div></div></div></div></span></div></span></div></span> </div><br></div></div></body></html>