[Insight-users] muliple pahse Chan Vese, one partition totally shrink

[Baoyun Li]

Hi, Wanlin:
 
I looked your paper at google book. However, I am still not clear.
 
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?
 
Also what numerical scheme are you used? Can you send me your paper?
 
Thanks
 
Baoyun
--- On Thu, 3/25/10, wlzhu <wanlinzhu at gmail.com> wrote:


From: wlzhu <wanlinzhu at gmail.com>
Subject: Re: [Insight-users] muliple pahse Chan Vese, one partition totally shrink
To: "Baoyun Li" <baoyun_li123 at yahoo.com>
Cc: insight-users at itk.org
Date: Thursday, March 25, 2010, 2:55 PM


Hi, baoyun, 
    You may have a look at this paper. 

http://www.springerlink.com/content/q0186ju536h0gw6p/

which proposed 3-phase level set brain tissue segmentation.




On Thu, Mar 25, 2010 at 8:52 AM, Baoyun Li <baoyun_li123 at yahoo.com> wrote:






Dear All:
 
I have a theoritical question about Chen Vese multiplse pahse leve set.
 
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
 
%c11 = mean (phi1>0 & phi2>0)
%c12 = mean (phi1>0 & phi2<0)
%c21 = mean (phi1<0 & phi2>0)
%c22 = mean (phi1<0 & phi2<0)
 
How about if I only have three segments, let say segment (phi1<0 & phi2<0) will finally shrink to zeros.
 
Then how to I calcuate c22, and also what value of c22 I should use to update leve set equation as shown below:
 
((u-c22)^2-(u-c12)^2)H(phi2).
 
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.
 
Thanks
Baoyun
 
 
 
 
 

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