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

[wlzhu]

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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