How do I fit an ellipse to a partial ellipse image?

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D Kemper
D Kemper 2018-5-20
回答： Michal 2022-5-18
I have a binary image which contains a part of an ellipse. Now, I would like to fit an ellipse to this data:
I have tried regionprops, but this doesn't work because it doesn't contain a
whole ellipse:
How can I fit an ellipse following the borders of the partial ellipse image?
It would be even better to separate the binary image in a left and right part and fitting two separate ellipses for the left and right part.
Any help is appreciated.

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回答（2 个）

Image Analyst
Image Analyst 2018-5-20
See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_fit_an_ellipse_or_other_shape_to_a_set_of_XY_data.3F
Be sure to remove any points where y = 1 or y = the number of rows in the image because you do not want to include the flat top and bottom in the fit.
Michal
Michal 2022-5-18
I've use this one from Matlab File Exchange in the past and it worked nicely
kudos to Ohad Gal for this one :)
https://www.mathworks.com/matlabcentral/fileexchange/3215-fit_ellipse?s_tid=srchtitle

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