The reason i use 3 pahese segmentation is the following two folds:<br><br>
1. Explicitly impose constraints that 3 regions only. (for real
situation, for instance brain tissue segmentation, due to the bias field or
other artifacts, if you set 4 phases, you will get 4 segmented regions,
unless you input image is perfectly composed of 3 regions).<br>
2. Introduce mutual competition for any two regions. (which is based on
any two region has a boundary(WM/GM, WM/CSV and GM/CSF). <br>
<br>
I will send you the draft.<br><br><br><br><div class="gmail_quote">On Fri, Mar 26, 2010 at 2:44 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;">
<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>Hi, Wanlin:</div>
<div> </div>
<div>I looked your paper at google book. However, I am still not clear.</div>
<div> </div>
<div>I would like to following Chan vese multiphase scheme. My object may contain 4 segments or 3 segments. How to make the method having the flexibiltiy to deal with 2-4 segments? Does you method provide the flexibility to deal with varies number of phases?</div>
<div> </div>
<div>Also what numerical scheme are you used? Can you send me your paper?</div>
<div> </div>
<div>Thanks</div>
<div> </div>
<div>Baoyun<br>--- On <b>Thu, 3/25/10, wlzhu <i><<a href="mailto:wanlinzhu@gmail.com" target="_blank">wanlinzhu@gmail.com</a>></i></b> wrote:<br></div>
<blockquote style="border-left: 2px solid rgb(16, 16, 255); padding-left: 5px; margin-left: 5px;"><br>From: wlzhu <<a href="mailto:wanlinzhu@gmail.com" target="_blank">wanlinzhu@gmail.com</a>><br>Subject: Re: [Insight-users] muliple pahse Chan Vese, one partition totally shrink<br>
To: "Baoyun Li" <<a href="mailto:baoyun_li123@yahoo.com" target="_blank">baoyun_li123@yahoo.com</a>><br>Cc: <a href="mailto:insight-users@itk.org" target="_blank">insight-users@itk.org</a><br>Date: Thursday, March 25, 2010, 2:55 PM<div>
<div></div><div class="h5"><br><br>
<div>Hi, baoyun, <br> You may have a look at this paper. <br><br><a href="http://www.springerlink.com/content/q0186ju536h0gw6p/" rel="nofollow" target="_blank">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="http://us.mc1110.mail.yahoo.com/mc/compose?to=baoyun_li123@yahoo.com" rel="nofollow" target="_blank">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-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><br>_____________________________________<br>Powered by <a href="http://www.kitware.com/" rel="nofollow" target="_blank">www.kitware.com</a><br><br>Visit other Kitware open-source projects at<br>
<a href="http://www.kitware.com/opensource/opensource.html" rel="nofollow" target="_blank">http://www.kitware.com/opensource/opensource.html</a><br><br>Kitware offers ITK Training Courses, for more information visit:<br><a href="http://www.kitware.com/products/protraining.html" rel="nofollow" target="_blank">http://www.kitware.com/products/protraining.html</a><br>
<br>Please keep messages on-topic and check the ITK FAQ at:<br><a href="http://www.itk.org/Wiki/ITK_FAQ" rel="nofollow" target="_blank">http://www.itk.org/Wiki/ITK_FAQ</a><br><br>Follow this link to subscribe/unsubscribe:<br>
<a href="http://www.itk.org/mailman/listinfo/insight-users" rel="nofollow" target="_blank">http://www.itk.org/mailman/listinfo/insight-users</a><br><br></blockquote></div><br></div></div></div></blockquote></td></tr></tbody></table>
<br>
</blockquote></div><br>