kmeans Segmentation Clarification for color images

2014 2 11
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更新时间：2018 10 3
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I had segmented the attached image using kmeans. After kmeans color image segmentation, when I had plotted the cluster centers, I found that, the cluster center was not at the correct point. Why?

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dataImage = imread('fpot3_1.jpg');
cform = makecform('srgb2lab');
lab_he = applycform(dataImage,cform);
ab = double(lab_he(:,:,2:3));
nrows = size(ab,1);
ncols = size(ab,2);
ab = reshape(ab,nrows*ncols,2);
nColors = 3;
[cluster_idx,cluster_center] = kmeans(ab,nColors,'emptyaction','singleton');
pixel_labels = reshape(cluster_idx,nrows,ncols);
imshow(pixel_labels,[]); hold on;
plot(cluster_center(:,2),cluster_center(:,1),'r*')
can you please explain each line of k means segmentation?
Image Analyst
Image Analyst 2018-10-3
You can try mine (attached). I always put in lots of comments.

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Anand
Anand 2014-2-16

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Your cluster centers are not in the XY co-ordinate space. They are in the AB color space. So cluster_center does not refer to a location on the image.

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Image Analyst
Image Analyst 2014-2-16

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I closely following up your file exchange list. I had worked with all your demos in that list. But right now I'm working with kmeans Color Image Segmentation.
Anand
Anand 2014-2-17
What didn't work in the link Image Analyst suggested?

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