How to compute centroidal distances

Question

Elysi Cochin 2018-1-3

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回答： Image Analyst 2018-1-6

I wanted to compute centroidal distances, by calculating the distance is between the geometric centroid of the segmented object and the brightness centroid of the same.

% Is geometric centroid same as 
s = regionprops(BW,'centroid');

what is brightness centroid

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Answer 1

Matt J 2018-1-3

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编辑：Matt J 2018-1-6

I assume you mean regionprops(BW, I ,'WeightedCentroid') ? You need an intensity image I, to invoke that option.

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Answer 2

Image Analyst 2018-1-6

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在 MATLAB Online 中打开

You can use regionprops() and sqrt(), like this untested code:

props = regionprops(binaryImage, grayImage, 'Centroid', 'WeightedCentroid');
% Extract centroids into x and y from structure.
centroids = [props.Centroid];
xCentroids = centroids(1:2:end);
yCentroids = centroids(2:2:end);
weightedCentroids = [props.WeightedCentroid];
xWeightedCentroids = weightedCentroids(1:2:end);
yWeightedCentroids = weightedCentroids(2:2:end);
% Compute distances between the centroids and the weighted centroids.
distances = sqrt((xCentroids - xWeightedCentroids) .^2 + (yCentroids - yWeightedCentroids) .^ 2);