how to use k means

I have detected features of image using

I = imread('cameraman.tif');

points = detectSURFFeatures(I);

now i have to apply k means to cluster the points,plz ell how i can use k means

[José-Luis]

Have you tried reading the documentation? It is a good idea to start there.

 doc kmeans

Answer 1

[Wayne King]

Jose-Luis has a very good suggestion.

You can use kmeans() as follows:

   I = imread('cameraman.tif');
   points = detectSURFFeatures(I);
   % I'll assume 3 clusters
   idx = kmeans(points.Location,3);

[nkumar]

ok wayne i have struck here

i have extracted entropyfilt feature for an image

idx = kmeans(flatImg,3);
    imshow(ind2rgb(reshape(idx, size(I,1), size(I, 2)), [0 0 1; 0 .8 0;1 0 0]))

size is 256x256

can u plz tell how to apply same for idx values because i get only 182 values