Finding eccentricity of plotted ellipse in matlab

StackOverflow https://stackoverflow.com/questions/18169757

  •  24-06-2022
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Question

I am new to matlab, so this might be a trivial question. But I couldn't find any help googling, regarding this. I have a set of points, and from that I have found a minimum bounding ellipse, enclosing those points. The function returns the center of the ellipse, and a matrix A (in center form). I need to find eccentricity of the ellipse, along with properties like semi-axes lengths of the same ellipse.

And some pointers as to what exactly A contains, is also appreciated. Thanks a lot.

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Solution

Once you construct your ellipse you can use regionprops() function to get properties of the ellipse object.

s = regionprops(bw, 'Orientation', 'MajorAxisLength', ...
    'MinorAxisLength', 'Eccentricity')

For more on how to contruct your object read http://blogs.mathworks.com/steve/2010/07/30/visualizing-regionprops-ellipse-measurements/

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