How can I plot the diameters of an irregularly shaped region in an image?

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Asher Zaidi
Asher Zaidi 2018-6-28
评论： Asher Zaidi 2018-6-29
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?

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采纳的回答

Image Analyst
Image Analyst 2018-6-28
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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显示 1更早的评论
Image Analyst
Image Analyst 2018-6-29
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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更多回答（1 个）

Matt J
Matt J 2018-6-28
编辑：Matt J 2018-6-28
You can use the text() command to write the diameters onto the image at desired locations.

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