<br>Hi Baoyun,<br><br><br>You seem to be mixing two different issues here.<br><br>One thing is to segment the image in different regions,<br>and a separate issue is to find an efficient encoding <br>for the resulting segmentations.<br>
<br><br>If you want to segment three different anatomical structures<br>from your image, then you want to use a level set with <br>three phases.<br><br>That is, one phase per object to be segmented.<br><br><br> Regards,<br>
<br><br> Luis<br><br><br>-----------------------------------------------------------------------------<br><div class="gmail_quote">On Wed, Mar 24, 2010 at 5:52 PM, Baoyun Li <span dir="ltr"><<a href="mailto:baoyun_li123@yahoo.com">baoyun_li123@yahoo.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td style="font-family: inherit; font-style: inherit; font-variant: inherit; font-weight: inherit; font-size: inherit; line-height: inherit; font-size-adjust: inherit; font-stretch: inherit;" valign="top">
<div>Dear All:</div>
<div> </div>
<div>I have a theoritical question about Chen Vese multiplse pahse leve set.</div>
<div> </div>
<div>I have two level set and the two level set can segment the image to 4 segments, then I can calculate the mean for each segments as following</div>
<div> </div><font size="2">
<div>%c11 = mean (phi1>0 & phi2>0)</div>
<div>%c12 = mean (phi1>0 & phi2<0)</div>
<div>%c21 = mean (phi1<0 & phi2>0)</div>
<div>%c22 = mean (phi1<0 & phi2<0)</div></font>
<div> </div>
<div>How about if I only have three segments, let say segment (phi1<0 & phi2<0) will finally shrink to zeros.</div>
<div> </div>
<div>Then how to I calcuate c22, and also what value of c22 I should use to update leve set equation as shown below:</div>
<div> </div>
<div>((u-c22)^2-(u-c12)^2)H(phi2).</div>
<div> </div>
<div>I saw somebody use the mininum number of the machine to replace c22, but I could not imagine what will happen and why to do that.</div>
<div> </div>
<div>Thanks</div>
<div>Baoyun</div>
<div> </div>
<div> </div>
<div> </div>
<div> </div>
<div> </div></td></tr></tbody></table><br>
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