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How to get the pixel value at centroid point

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Elysi Cochin 2017-9-20

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https://ww2.mathworks.cn/matlabcentral/answers/357489-how-to-get-the-pixel-value-at-centroid-point

回答： Walter Roberson 2017-9-20

采纳的回答： Walter Roberson

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how i get the pixel value at the centroid of image

i did as below

cn = s(1).Centroid;
rc = round(cn);
pixelValue = img(rc(1),rc(2));

but in some cases error is shown as

Index exceeds matrix dimensions.

Error in exe_demo (line 73)
pixelValue = img(rc(1),rc(2))

But the centroid point is plotted correctly. How to get the pixel value at that point without error.

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Walter Roberson 2017-9-20

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https://ww2.mathworks.cn/matlabcentral/answers/357489-how-to-get-the-pixel-value-at-centroid-point#answer_282343

在 MATLAB Online 中打开

pixelValue = img(rc(2), rc(1));

The centroid coordinate order is X, Y, but image arrays are in the order Y, X.

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