Center of mass in binary image

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Felix
Felix 2013-9-18
评论： Walter Roberson 2016-12-16
Hello, I have a binary image with one object. How can I calculate the center of this object, to mark it in my image and to write the coordinates in the corner of this image, like this: object: X, Y
I used this code to calculate the center of mass:
s = regionprops(bw, 'centroid');
centroids = cat(1, s.Centroid);
imshow('MY_IMAGE.jpg')
hold on
plot(centroids(:,1), centroids(:,2), 'b*')
hold off
but how can i plot this coordinates on my image in the left corner?
Thank you for help

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采纳的回答

David Sanchez
David Sanchez 2013-9-18
use text command:
your_string = strcat( num2str(centroids(:,1)),'-', num2str(centroids(:,2)));
text(10,10,your_string)
change the position by changing the "10,10" values
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Image Analyst
Image Analyst 2013-9-18
Use sprintf to create your string, and cast your numbers to integers or use %.0f:
textString = sprintf('Object: %d, %d (coordinates)', int32(X), int32(Y));
text(x,y,textString);

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更多回答（2 个）

Walter Roberson
Walter Roberson 2013-9-18
ndgrid() of 1:width and 1:height, do a logical indexing of those according to the binary image, calculate the mean() of what is left in each of the two coordinate matrices. Result will be centre of mass along each of the two coordinates.
Mauldy Putra
Mauldy Putra 2016-12-16
i want to ask, in your code there is bw i want to know what is bw stand for? cause i try use your code it's said "Undefined function or variable 'bw'."
thank you

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