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How to get ellipse points position after using fitEllipse?

asked 2016-01-18 20:53:56 -0500

mrmuto2 gravatar image

updated 2016-01-18 20:55:12 -0500

There is a set of points. I have used fitEllipse to approximate it by ellipse. But i don't know how to get the new position(x,y) of ellipse points. I have checked the document, but cannot find the solution.Can somebody help?

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answered 2016-01-18 21:01:44 -0500

Tetragramm gravatar image

The RotatedRect contains all the information you need. The long side is the semi-major, the short side is the semi-minor, the center, and the rotation.

You can use standard geometry to find the points, or, if you want image pixels, take a blank image and use cv::ellipse to draw with white and make a mask.

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To complete, if you want to have the coordinates of points sampled on the fitted ellipse, you can look at the equation for the parametric form of the ellipse.

Eduardo gravatar imageEduardo ( 2016-01-19 03:27:23 -0500 )edit
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Asked: 2016-01-18 20:53:56 -0500

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Last updated: Jan 18 '16