<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><div><pre><span style="color: red; font-family: times new roman,new york,times,serif;" lang="EN-GB"><span style="color: rgb(0, 0, 0);">Hi,<br><br>I want to compute crest lines for a 3D image.<br> <br>I used the algorithme described in : </span><span style=""></span><span style="color: rgb(0, 0, 0);">"Crest lines extraction in volume 3D medical images</span><span style="color: rgb(0, 0, 0);"> a multi-scale approach"<br><br>The first step is to compute order partial derivatives(1-2-3) of image this by using </span></span><span style="font-size: 12pt; font-family: "Times New Roman";"><span style="font-style: italic;">RecursiveGaussianImageFilter</span>.</span><span style="color: red;" lang="EN-GB"><span style=""></span></span><span style="color: red;"><a
href="http://hal.inria.fr/inria-00074338/en/"><span style="color: red;" lang="EN-GB"></span></a></span><br><span style="font-family: times new roman,new york,times,serif;">The second step is to compute the 3d edge point, using the </span><span style="color: red; font-family: times new roman,new york,times,serif;" lang="EN-GB"><span style="color: rgb(0, 0, 0);">order partial </span></span><span style="font-family: times new roman,new york,times,serif;">derivative(1), <br>the third step is to compute, for each point, a) the two principal curvature and the corresponding directions <br> b) the extremality criterian<br><br><br>My question is how can i do the second and third steps using ITK.<br><br></span><span style="font-size: 12pt; font-family: "Times New Roman"; color: rgb(0, 0, 0);">many thanks in advanced.</span><br><br><span style="font-family: times new roman,new york,times,serif;">Nejla</span><span style="color: red;"
lang="EN-GB"><o:p></o:p></span><span style="color: red;" lang="EN-GB"><span style="font-family: mon;"><span style="font-style: italic;"><span style="color: rgb(0, 0, 0);"></span><br></span></span><i><span style=""> </span><o:p></o:p></i></span></pre><pre><span style="color: red;" lang="EN-GB"><i><br><o:p></o:p></i></span></pre></div></div><br>__________________________________________________<br>Do You Yahoo!?<br>En finir avec le spam? Yahoo! Mail vous offre la meilleure protection possible contre les messages non sollicités <br>http://mail.yahoo.fr Yahoo! Mail </body></html>