hough ellipse detection

[Matthias Verstraete]

Hy,

I'm trying to detect ellipses using the hough_ellipse method provided by 
scikit-image. However, one of the axis of the result ellipse is always 
zero. I've tries adjusting all the parameters but nothing helped. Does 
anyone know why only one axis can be larger than 0 and how I can fix it?

Thanks
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