<div>Hi Ruben,</div>
<div> </div>
<div>I reffered to two papers to extract the centerlines,</div>
<div> </div>
<div>A Robust Level-set algorithm for centerline extraction.</div>
<div>An augmented Fast marching method for computing skeletons and centerlines.</div>
<div> </div>
<div>both from Joint EUROGRAPHICS - IEEE TCVG Symposium on Visualization (2002 - 2003).</div>
<div> </div>
<div>I implimented this in matlab. I still have to figure out why i am not getting a single voxel wide centerline and also want to see if i can fit a line through the centerline voxels even if its not 1 voxel wide and use that as reference.
</div>
<div> </div>
<div>Ajay.<br><br> </div>
<div><span class="gmail_quote">On 5/24/07, <b class="gmail_sendername">Ruben Schilling</b> <<a href="mailto:r.b.schilling@googlemail.com">r.b.schilling@googlemail.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div style="WORD-WRAP: break-word">Hi Ajay,
<div><br> </div>
<div>I actually want to do the same thing and have some questions and some answers. I can share how I approach this problem at the minute. I use the Danielsson Distance map from ITK to calculate a distance transform. You would then have to extract local maxima from it, that correspond to your skeleton. This approach requires preprocessing to fill wholes, which can be done in itk via the iterative fill holes filter.
</div>
<div><br> </div>
<div>My question:</div>
<div><br> </div>
<div>I would like to have 1 voxel thin lines or even better: a discrete graph extracted.</div>
<div><br> </div>
<div>Can anyone tell me (us) how to do this?</div>
<div><br> </div>
<div>Best</div>
<div>Ruben</div>
<div><br> </div>
<div><br> </div>
<div><br>
<div>
<div>Am 24.05.2007 um 16:27 schrieb Ajay Sonar:</div>
<div><span class="e" id="q_112bf2b3a769498d_1"><br>
<blockquote type="cite"><span style="WORD-SPACING: 0px; FONT: 12px Helvetica; TEXT-TRANSFORM: none; COLOR: rgb(0,0,0); TEXT-INDENT: 0px; WHITE-SPACE: normal; LETTER-SPACING: normal; BORDER-COLLAPSE: separate; border-spacing: 0px 0px">
<div>Hi All,</div>
<div> </div>
<div>I am new to ITK. Can anyone tell me if there is a way to extract the skeleton lines/center lines from a stack of image slices. I have a set of microCT images and i can get the surface or the voxel model from it in MATLAB. I need to extract the skeleton lines from it. I tried a few things but cannot get a single voxel width centerline.
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<div> </div>
<div> </div>
<div>Thanks,</div>
<div>Ajay.</div></span></blockquote></span></div></div><br> </div></div></blockquote></div><br>