how to find center point coordinates of circles in an image file

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Suleyman Deveci 2013-3-26

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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.

I appreciate very much for your help.

Regards

Suleyman

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Answer 1

Anand 2013-3-26

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在 MATLAB Online 中打开

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:

http://blogs.mathworks.com/steve/2012/09/04/detecting-circular-objects-in-images/

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);