How to correct the assignment Error?

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PRIYANGA 2012-12-14

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I have to run the K-means clustering program using matlab.

im = imread('D:\lena256.jpg');
k=5; 
%histogram calculation
img_hist = zeros(256,1);
hist_value = zeros(256,1);
for i=1:256
  img_hist(i)=sum(sum(im==(i-1)));    
end

Run above code the following error occurred.

??? In an assignment  A(:) = B, the number of elements in A and B
must be the same.
Error in ==> kmeansclustering at 10
  img_hist(i)=sum(sum(im==(i-1)));
Error in ==> main at 5
[clusters, result_image, clusterized_image] = kmeansclustering(im,k);

How do I solve this problem?

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Matt J 2012-12-14

Incidentally, why not use HISTC to generate the histogram? Why re-invent that wheel with for-loops?

PRIYANGA 2012-12-14

ok Sir I have to try.

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José-Luis 2012-12-14

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在 MATLAB Online 中打开

Try

img_hist(i)= sum(sum(sum(im==(i-1))));

im might be a three dimensional matrix.

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PRIYANGA 2012-12-14

Thank You So Much Sir. Its working

José-Luis 2012-12-14

My pleasure, but please edit your posts for clarity in the future.

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Jürgen 2012-12-14

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Hi,

there is a function: imhist(I) , quite useful for this work, + if you want to calculate the hist by summing for each value 0=>255 you will get a array with a lenght of 256 not 256*256

regards,J