<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">There is Otsu's methods:<div><br></div><div><a href="http://www.itk.org/Doxygen/html/classitk_1_1OtsuThresholdImageFilter.html">http://www.itk.org/Doxygen/html/classitk_1_1OtsuThresholdImageFilter.html</a></div><div><a href="http://www.itk.org/Doxygen/html/classitk_1_1OtsuMultipleThresholdsImageFilter.html">http://www.itk.org/Doxygen/html/classitk_1_1OtsuMultipleThresholdsImageFilter.html</a></div><div><br></div><div><a href="http://en.wikipedia.org/wiki/Otsu's_method">http://en.wikipedia.org/wiki/Otsu's_method</a></div><div><br><div><div>On Jul 16, 2009, at 5:59 AM, Elena Molina wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi all!<br>Is there some algorithm to calculate the best lower and upper thresholds in <br>segmentation algorithms?<br>Thanks<br><br> <span><ATT00001.txt></span></blockquote></div><br><div apple-content-edited="true"> <span class="Apple-style-span" style="font-size: 12px; "><div style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; 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; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">========================================================</font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">Bradley Lowekamp<span class="Apple-converted-space"> </span><span class="Apple-converted-space"> </span></font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font class="Apple-style-span" face="Arial"><span class="Apple-style-span" style="font-family: Arial; "><span class="Apple-style-span" style="font-family: Arial; ">Lockheed Martin </span></span></font><font face="Helvetica" size="3" style="font: 12.0px Helvetica">Contractor for</font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">Office of High Performance Computing and Communications</font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">National Library of Medicine<span class="Apple-converted-space"> </span></font></p><p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica"><a href="mailto:blowekamp@mail.nih.gov">blowekamp@mail.nih.gov</a></font></p><br class="Apple-interchange-newline"></span></div></span> </div><br></div></body></html>