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Obtaining the best ellipse fit of an irregular shape

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med-sweng
med-sweng 2014-10-3
回答： Image Analyst 2014-10-3
Say that we have an irregular shape. How can we obtain the best `ellipse` fit of such shape? Does `regionprops` work for that? If so, can you kindly guide me on that?
Thanks.

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Sean de Wolski
Sean de Wolski 2014-10-3
http://www.mathworks.com/matlabcentral/fileexchange/index?utf8=%E2%9C%93&term=fit+ellipse
Use one of those functions on the row/col coordinates of the pixels in the object
Image Analyst
Image Analyst 2014-10-3
Yes, regionprops can probably do what you want. Check out Steve's blog for a demo. http://blogs.mathworks.com/steve/2010/07/30/visualizing-regionprops-ellipse-measurements/
To find ellipses in a gray scale image you might check out http://www.ecse.rpi.edu/homepages/qji/Papers/ellipse_det_icpr02.pdf
You might also check out this paper:
Pattern Recognition 34 (2001) 2283}2303
Least-squares orthogonal distances Fitting of circle, sphere, ellipse, hyperbola, and parabola
Sung Joon Ahn, Wolfgang Rauh, Hans-Jurgen Warnecke

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