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compute centroid of a matrix

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Elysi Cochin
Elysi Cochin 2014-6-9
回答： David Lieberman 2017-8-10
how to compute centroid of a matrix? is it possible?

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Matt J
Matt J 2014-6-9
编辑：Matt J 2014-6-9
If you have the Image Processing Toolbox,
regionprops(true(size(matrix)), matrix, 'WeightedCentroid');
Otherwise,
matrix=matrix/sum(matrix(:));
[m,n]=size(matrix);
[I,J]=ndgrid(1:m,1:n);
centroid=[dot(I(:),matrix(:)), dot(J(:),matrix(:))]

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David Lieberman
David Lieberman 2017-8-10
x = sum(sum(matrix).*(1:size(matrix,2)))/sum(sum(matrix))
y is computed similarly

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