How to ellipse fitting the object

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leon
leon 2013-3-26
评论： L 2021-3-10
how to ellipse fitting the object?
http://snag.gy/oSz2X.jpg http://snag.gy/UBlgG.jpg http://snag.gy/e8mJG.jpg http://snag.gy/sI69L.jpg http://snag.gy/Rz8dB.jpg

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Image Analyst
Image Analyst 2013-3-26
编辑：Image Analyst 2013-3-26
regionprops() can do that. It give the major axis, minor axis, and orientation for each blob in the image.
You may also want to see this paper: http://www.ecse.rpi.edu/homepages/qji/Papers/ellipse_det_icpr02.pdf
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Image Analyst
Image Analyst 2021-3-7
编辑：Image Analyst 2021-3-7
  1. regionprops() measures only the angle, centroid, and major and minor axis lengths. It does not give a full (x,y) equation.
  2. regionprops() can handle multiple blobs in an image. You can return the results in a structure array (the default) or a table (if you specify the 'table' input option).
  3. I don't know if it's possible to modify imfindcircles() to find ellipses. You can try to program up the attached paper if you want to find ellipses.
Also see this answer:
https://www.mathworks.com/matlabcentral/answers/53525-fitting-an-ellipse-to-my-binary-iris-image#answer_65140
and my attached demo.
L
L 2021-3-10
Thank you.
Also, is it possible to use the imfindcircles() as an texture detector? Something like a Gabor filter, to highlight the curve-shaped textures?
I saw the paper that you have attached. But, what happens if the image is noisy? The method in the paper could be ssensitive in noise.
This is the reason I would try to detect the texutres first. Later, maybe the detection method would be combined with texture analysis.

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