How to identify the disk edge?

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Steven
Steven 2014-3-17
编辑： Steven 2016-4-26
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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Image Analyst
Image Analyst 2014-3-17
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 2014-3-17
编辑：Steven 2014-3-17
Thanks.
How to get the edge using bwboundaries?
Thanks
Steven
Image Analyst
Image Analyst 2014-3-17
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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