<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Dear All:</DIV>
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<DIV>I believed that Arnaud is right. In my case, the objects are not distcted each other.</DIV>
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<DIV>Also, kishore, how should I used itkChenAndVese filter if my inputs are vector images. As I understand, this filter doesnot surpport vector image as input. </DIV>
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<DIV>Thanks</DIV>
<DIV> </DIV>
<DIV>Baoyun<BR>--- On <B>Fri, 3/26/10, Arnaud GELAS <I><arnaud_gelas@hms.harvard.edu></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From: Arnaud GELAS <arnaud_gelas@hms.harvard.edu><BR>Subject: Re: [Insight-users] muliple pahse Chan Vese, one partition totally shrink<BR>To: "Kishore Mosaliganti" <kishoreraom@gmail.com><BR>Cc: "Baoyun Li" <baoyun_li123@yahoo.com>, "insight-users@itk.org" <insight-users@itk.org>, "Luis Ibanez" <luis.ibanez@kitware.com><BR>Date: Friday, March 26, 2010, 6:26 PM<BR><BR>
<DIV id=yiv1296156463>Just a comment regarding the kd-tree optimization, this will work only if considered objects are really distinct. (One object must not contain another one).<BR>But if I correctly understood what you want to do, this should not apply to your case...<BR><BR>On 03/26/2010 01:25 PM, Kishore Mosaliganti wrote:
<BLOCKQUOTE type="cite">Hi Baoyun,<BR><BR>You are right that if you set 4 phases in the levelset, then no phase will shrink to empty.<BR><BR>In ITK, if you use the classes on ScalarChanAndVeseLevelSetImageFilter, you can separately encode the 3 regions in 3 separate level-set functions and these functions compete with each other for the segmentations at the boundaries. You can also control each level-set parameters separately. <BR><BR>If you have N objects, then you can make use of a built-in kd-tree optimization that speeds up the approach. Each levelset function is only defined in a small subdomain containing your object instead of the whole image thereby saving space.<BR><BR><BR>Kishore<BR><BR>
<DIV class=gmail_quote>On Fri, Mar 26, 2010 at 10:48 AM, Baoyun Li <SPAN dir=ltr><<A href="http://us.mc1110.mail.yahoo.com/mc/compose?to=baoyun_li123@yahoo.com" target=_blank rel=nofollow ymailto="mailto:baoyun_li123@yahoo.com">baoyun_li123@yahoo.com</A>></SPAN> wrote:<BR>
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<DIV>Dear All:</DIV>
<DIV> </DIV>
<DIV>Thanks for your reply, now seems I undertand the question more.</DIV>
<DIV> </DIV>
<DIV>According to Wanlin's paper, I need to encoding the 2 level set to 3 phase if I want to 3 segmenations. If I need 4 segmentation, I need to encode the levelset to 4 phases.</DIV>
<DIV> </DIV>
<DIV>So my origianl question is not correct, once I set 4 phases, no phase will shrink to empty, and I will get 4 segmentation anyway. (Please correct me if I am wrong).</DIV>
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<DIV>Thanks and my best regards</DIV>
<DIV> </DIV>
<DIV>Baoyun</DIV>
<DIV> </DIV>
<DIV>Please correct me if I am wrong<BR><BR>--- On <B>Thu, 3/25/10, Luis Ibanez <I><<A href="http://us.mc1110.mail.yahoo.com/mc/compose?to=luis.ibanez@kitware.com" target=_blank rel=nofollow ymailto="mailto:luis.ibanez@kitware.com">luis.ibanez@kitware.com</A>></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><BR>From: Luis Ibanez <<A href="http://us.mc1110.mail.yahoo.com/mc/compose?to=luis.ibanez@kitware.com" target=_blank rel=nofollow ymailto="mailto:luis.ibanez@kitware.com">luis.ibanez@kitware.com</A>>
<DIV class=im><BR>Subject: Re: [Insight-users] muliple pahse Chan Vese, one partition totally shrink<BR>To: "Baoyun Li" <<A href="http://us.mc1110.mail.yahoo.com/mc/compose?to=baoyun_li123@yahoo.com" target=_blank rel=nofollow ymailto="mailto:baoyun_li123@yahoo.com">baoyun_li123@yahoo.com</A>><BR></DIV>Cc: <A href="http://us.mc1110.mail.yahoo.com/mc/compose?to=insight-users@itk.org" target=_blank rel=nofollow ymailto="mailto:insight-users@itk.org">insight-users@itk.org</A>, "Mosaliganti, Kishore Rao" <<A href="http://us.mc1110.mail.yahoo.com/mc/compose?to=Kishore_Mosaliganti@hms.harvard.edu" target=_blank rel=nofollow ymailto="mailto:Kishore_Mosaliganti@hms.harvard.edu">Kishore_Mosaliganti@hms.harvard.edu</A>><BR>Date: Thursday, March 25, 2010, 10:43 PM
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<DIV><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="http://us.mc1110.mail.yahoo.com/mc/compose?to=baoyun_li123@yahoo.com" target=_blank rel=nofollow>baoyun_li123@yahoo.com</A>></SPAN> wrote:<BR>
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<DIV>Dear All:</DIV>
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<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>
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<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>
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<DIV>How about if I only have three segments, let say segment (phi1<0 & phi2<0) will finally shrink to zeros.</DIV>
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<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>
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<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>
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<DIV>Thanks</DIV>
<DIV>Baoyun</DIV>
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