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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Sergio, thank you for the response. As you said, it was pretty straightforward.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">For the record: I calculated the Euler number like this given a label image:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoNormal" style="color:navy;mso-list:l0 level1 lfo1"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial">isolate the cluster/component using BinaryThresholdImageFilter<o:p></o:p></span></font>
</li><li class="MsoNormal" style="color:navy;mso-list:l0 level1 lfo1"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial">calculate a version with possible holes filled using BinaryFillHoleImageFilter<o:p></o:p></span></font>
</li><li class="MsoNormal" style="color:navy;mso-list:l0 level1 lfo1"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Use XORImageFilter between the two results in an image with only the holes<o:p></o:p></span></font>
</li><li class="MsoNormal" style="color:navy;mso-list:l0 level1 lfo1"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Use ConnectedComponentImageFilter to count the holes.<o:p></o:p></span></font>
</li></ol>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">The resulting Euler Number is 1 - nrHoles.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;
font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma"> Sergio Vera [mailto:sergio.vera@alma3d.com]
<br>
<b><span style="font-weight:bold">Sent:</span></b> woensdag 5 oktober 2011 17:01<br>
<b><span style="font-weight:bold">To:</span></b> Buuren, T.P.H. (Thomas) van<br>
<b><span style="font-weight:bold">Cc:</span></b> <st1:PersonName w:st="on">insight-users@itk.org</st1:PersonName><br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [Insight-users] Determine Euler number of binary image in ITK (similar to bweuler in Matlab)</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">Hi Thomas<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">To my knowledge, a single filter that does that calculation does not exists, but it should be pretty straightforward to do by using the label manipulation filters that
you may use if you compile ITK with ITK_REVIEW set to true.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">Regards<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">On Wed, Oct 5, 2011 at 2:46 PM, Buuren, T.P.H. (Thomas) van <<a href="mailto:thomas.vanbuuren@tno.nl">thomas.vanbuuren@tno.nl</a>> wrote:<o:p></o:p></span></font></p>
<div link="blue" vlink="purple">
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Does anyone know if there is a way in ITK to determine the Euler number of a binary image, similar to
the Matlab’s bweuler(…) ?</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Thank you,
</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Kind Regards</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial">Thomas</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">--
<br>
Sergio Vera<br>
<br>
<st1:City w:st="on"><st1:place w:st="on">Alma</st1:place></st1:City> IT Systems<br>
C/ Vilana, 4B, 4º 1ª<br>
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T. (+34) 932 380 592<br>
<a href="http://www.alma3d.com">www.alma3d.com</a><o:p></o:p></span></font></p>
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