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image segmentation using K-means

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Hello,
I want to do segmentation of iris (graylevel) using K-means algorithm.Here my code:
ab=imread('iris.tiff')
ab = double(ab);
nrows = size(ab,1);
ncols = size(ab,2);
ab = reshape(ab,nrows*ncols,1);                            
nColors=2                                                              
%repeat the clustering 3 times to avoid local minima  
[cluster_idx, cluster_center] = kmeans(ab,nColors,'distance','sqEuclidean', 'Replicates', 3);
pixel_labels = reshape(cluster_idx,nrows,ncols);          
pixel_labels=pixel_labels-1
the obtained segmentation image : pixel_labels gives diferrent value  in each compilation of code..Can someone help me to resolve this issue?

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image segmentation using K-means Hisoka 2015 <ghalem.kamel15@gmail.com> - 2020-08-02 11:04 -0700

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