Hi, baoyun, <br> You may have a look at this paper. <br><br><a href="http://www.springerlink.com/content/q0186ju536h0gw6p/">http://www.springerlink.com/content/q0186ju536h0gw6p/</a><br><br>which proposed 3-phase level set brain tissue segmentation.<br>
<br><br><br><div class="gmail_quote">On Thu, Mar 25, 2010 at 8:52 AM, 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;">
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<div>Dear All:</div>
<div> </div>
<div>I have a theoritical question about Chen Vese multiplse pahse leve set.</div>
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<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>
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