how to find center point coordinates of circles in an image file
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Dear friends
I need to find out the center point coordinates of circles in an image file. I read that hough transformation method can find the circles but my attempts to use this function was unsuccessful.
Here is a sample image file which has four white circular shape on it.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/151895/image.jpeg)
I appreciate very much for your help.
Regards
Suleyman
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Anand
le 26 Mar 2013
You can use imfindcircles to find the circles. The function returns circle centers and radii. If the circles can't be found using default parameters, look at this post by Steve Eddins and Spandan Tiwari for some insight into adjusting parameters:
A first pass:
%read image
im = imread('http://kimyamuhendisi.com/images/pipe.jpg');
%call imfindcircles
[c,r] = imfindcircles(im,[10,20]);
%display detected circles
imshow(im);viscircles(c,r);
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Image Analyst
le 26 Mar 2013
Alternatively you could threshold, and call regionprops() asking for the EquivDiameter and Centroid, as shown in my Image Segmentation Tutorial.
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