How can I plot the diameters of an irregularly shaped region in an image?
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Asher Zaidi
il 28 Giu 2018
Commentato: Asher Zaidi
il 29 Giu 2018
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:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/191542/image.jpeg)
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?
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Risposta accettata
Image Analyst
il 28 Giu 2018
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
3 Commenti
Image Analyst
il 29 Giu 2018
OK. You might make the font size a bit smaller. Honestly I don't know why you want the diameters on the image if there are so many of them.
But anyway, if I've answered all your questions, can you click the "Accept this answer" link?
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