Problems with kmeans clustering

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sam CP 2017-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/332942-problems-with-kmeans-clustering

评论： sam CP 2017-4-3

OI have used the following code to segment the attached image. But each iteration on the same image shows different result. How can i solve this by using rng('default'); ?

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Adam 2017-3-31

You should just need to explicitly set the seed (either to 'default' I guess or to any seed of your choice) before each call to kmeans if you want the same result each time.

sam CP 2017-3-31

编辑：sam CP 2017-3-31

在 MATLAB Online 中打开

 %k-means clustering algorithm
imData = reshape(Y,[],1);
imData = double(imData);
[IDX nn] = kmeans(imData,'default');
imIDX = reshape(IDX,size(Y));
figure, imshow(imIDX,[]),title('Image after applying k-means Clustering Algorithm');

Where can i apply the rng('default'); ?

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the cyclist 2017-3-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/332942-problems-with-kmeans-clustering#answer_261221

编辑：the cyclist 2017-3-31

在 MATLAB Online 中打开

Looking at your code, you should be able to put the line

rng('default')

literally anywhere before the call to kmeans, because you do not call any other random number functions. But the safest bet might be to call it in the line just before the call to kmeans, in case you do something differently later.

But, also, I don't think you put 'default' in the actual kmeans call. So it should be like this ...

%k-means clustering algorithm
imData = reshape(Y,[],1);
imData = double(imData);
rng('default')
[IDX nn] = kmeans(imData);
imIDX = reshape(IDX,size(Y));
figure, imshow(imIDX,[]),title('Image after applying k-means Clustering Algorithm');

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Image Analyst 2017-3-31

Yeah, but let's put "works" in quotation marks because kmeans() is not a good method for finding brain tumors. Imagine what your algorithm would find for class 4 if there were no tumor present, or a very small one. Yeah, see what I mean?

sam CP 2017-4-3