MATLAB: How to plot the diameters of an irregularly shaped region in an image

image analysisimage processingimage segmentationMATLAB

This is my code:
props = regionprops(BW, 'Area', 'Perimeter','Centroid','EquivDiameter');
allAreas = [props.Area];
allPerimeters = [props.Perimeter];
centroids = cat(1, props.Centroid);
allDiameters = [props.EquivDiameter];
figure(1);
imshow(BW);
title('Outlines, from bwboundaries()', 'FontSize', 1); 
axis image; % Make sure image is not artificially stretched because of screen's aspect ratio.
hold on;
boundaries = bwboundaries(BW);
numberOfBoundaries = size(boundaries, 1);
for k = 1 : numberOfBoundaries
  thisBoundary = boundaries{k};
  plot(thisBoundary(:,2), thisBoundary(:,1), 'r', 'LineWidth', 2);
end
hold on;
plot(centroids(:,1),centroids(:,2), 'b*')
hold off
This gives me the following image:
I got the actual values of the diameters through "EquivDiameter", but how can I plot the diameters of each individual blob on top of their centroids?

Best Answer

Try this:
xCentroids = centroids(1:2:end);
yCentroids = centroids(2:2:end);
for k = 1 : length(xCentroids )
  txt = sprintf(' %.2f', allDiameters(k));
        text(xCentroids(k), yCentroids(k), txt, 'FontSize', 20, 'FontWeight', 'bold');
end
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