Clustering coordinates on image

Question

jg 2020-4-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/518772-clustering-coordinates-on-image

评论： jg 2020-4-19

How would i cluster these points so that i am left wth 4 sets of coordinates in a 4 by 2 matrix currently it returns a 13 by 2.

This is the returned matrix.

centers =
5000    9.0000
5000   29.0000
0000   29.0000
5000   33.0000
0000   35.0000
5000   35.0000
5000   36.5000
5000   45.5000
5000  435.0000
5000  450.0000
5000  450.0000
0000  457.5000
5000  469.0000

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Answer 1

Image Analyst 2020-4-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/518772-clustering-coordinates-on-image#answer_426697

在 MATLAB Online 中打开

Try this:

centers =[...
	16.5000    9.0000
	8.5000   29.0000
	423.0000   29.0000
	18.5000   33.0000
	30.0000   35.0000
	448.5000   35.0000
	431.5000   36.5000
	37.5000   45.5000
	456.5000  435.0000
	43.5000  450.0000
	426.5000  450.0000
	445.0000  457.5000
	439.5000  469.0000];
subplot(1, 2, 1);
plot(centers(:, 2), centers(:, 1), 'r+', 'MarkerSize', 9, 'LineWidth', 2);
[indexes, centroids] = kmeans(centers, 4)
axis ij; % Flip axis direction.
grid on;
subplot(1, 2, 2);
gscatter(centers(:, 2), centers(:, 1), indexes);
axis ij; % Flip axis direction.
grid on;
% Put a big circle at the centroid
hold on;
plot(centroids(:, 2), centroids(:, 1), 'bo', 'MarkerSize', 30, 'LineWidth', 2);