Why is my centroid giving only 1 element per blob using region props?
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Elias Unk
am 21 Jul. 2017
Kommentiert: Image Analyst
am 23 Jul. 2017
they should be 2 per blob x and y elements
2 Kommentare
Guillaume
am 21 Jul. 2017
Without seeing some code or example to replicate your issue, it's difficult for us to say what you're doing wrong.
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Image Analyst
am 22 Jul. 2017
It's not clear exactly what you're calling an "element". I'll use more precise terminology. If your Iregion structure array is just one structure, then you have just one blob. The Centroid field of that structure will be a 1-by-2 array with the x and y locations of the centroid of that blob.
If you have multiple blobs, then you need to add an index after the structure variable name to get just one of the blobs, try this:
props = regionprops(bw2,'centroid');
hold on;
for k = 1 : length(props)
% Get x and y centroid of the k'th blob.
xCentroid = props(k).Centroid(1);
yCentroid = props(k).Centroid(2);
plot(xCentroid, yCentroid, 'r+', 'MarkerSize', 40, 'LineWidth', 2);
% Let user know what they are
message = sprintf('The largest blob has area %d and a centroid at (x,y) = (%f, %f)',...
props.Area, xCentroid, yCentroid)
uiwait(msgbox(message));
end
You can also get all the x and y centroids into arrays doing this:
centroids = [props.Centroid];
xCentroids = centroids(1:2:end);
yCentroids = centroids(2:2:end);
10 Kommentare
Image Analyst
am 23 Jul. 2017
It is not 56. I doubt it ever was with the image that you supplied me.
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