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How to identify the disk edge?

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Steven
Steven on 17 Mar 2014
Edited: Steven on 26 Apr 2016
How can MATLAB determine the radius of the disk? (imagine the center is known)
I know that if the whole circle is visible, I can use imfindcircle or other methods to determine the center and radius, but I wonder whether MATLAB can determine the edge of the radius for such an image?
Thanks
Steven

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Accepted Answer

Image Analyst
Image Analyst on 17 Mar 2014
Try it and see. Otherwise, just segment it and get the edge coordinates with bwboundaries() and use the FAQ to fit them to a circle or ellipse.

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Steven
Steven on 17 Mar 2014
Thanks.
How to get the edge using bwboundaries?
Thanks
Steven
Image Analyst
Image Analyst on 17 Mar 2014
First segment based on threshold
binaryImage = grayImage < 128; % or whatever value works.
Then get rid of small noise particles
binaryImage = bwareaopen(binaryImage, 10000);
Then call bwboundaries
boundaries = bwboundaries(binaryimage);
Then do the fit as per the FAQ.

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