How to correct the assignment Error?

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PRIYANGA
PRIYANGA 2012-12-14
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?
  3 个评论
显示 1更早的评论
Matt J
Matt J 2012-12-14
Incidentally, why not use HISTC to generate the histogram? Why re-invent that wheel with for-loops?

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采纳的回答

José-Luis
José-Luis 2012-12-14
Try
img_hist(i)= sum(sum(sum(im==(i-1))));
im might be a three dimensional matrix.
  2 个评论
PRIYANGA
PRIYANGA 2012-12-14
Thank You So Much Sir. Its working
José-Luis
José-Luis 2012-12-14
My pleasure, but please edit your posts for clarity in the future.

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更多回答（1 个）

Jürgen
Jürgen 2012-12-14
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
  1 个评论
Jürgen
Jürgen 2012-12-14
and indeed the comment of JL above is also a good point: the image could be a (VertRes, HorRes,3) matrix

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