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

[Luis Ibanez]

Hi Baoyun,


You seem to be mixing two different issues here.

One thing is to segment the image in different regions,
and a separate issue is to find an efficient encoding
for the resulting segmentations.


If you want to segment three different anatomical structures
from your image, then you want to use a level set with
three phases.

That is, one phase per object to be segmented.


      Regards,


            Luis


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On Wed, Mar 24, 2010 at 5:52 PM, 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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