k means clustering using k=4

Perform K-means clustering on the mandrill image with K=4.

can someone please help me with code for this question, as I'm a begineer don't have much idea about how to proceed with this question.

Answer 1

[KSSV]

I = imread('Mandril.jpeg') ; 
I = im2double(I);
R = I(:,:,1); R = R(:);
G = I(:,:,2); G = G(:);
B = I(:,:,3); B = B(:);
idx = kmeans([R G B], 4);
imshow(ind2rgb(reshape(idx, size(I,1), size(I, 2)), rand(4,3)))

[Walter Roberson]

Note that it was a homework question...

Answer 2

[Walter Roberson]

See the example at https://www.mathworks.com/help/stats/kmeans.html#bue6nb7-1

The line that has

[idx,C] = kmeans(X,3);

would change to

[idx,C] = kmeans(X,4);

if you were clustering with four clusters.