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fitEllipse bug? (for angle=180)

hello there,

if I want to fit the ellipse for an input image which is already an exact ellipse (rotated 180° to x-axis - that means height=vertical > width=horizontal), then the opencv function fitEllipse returns the correct angle (=180) but the size is totally wrong.

e.g. for an ellipse with width=43, height=86 - it returns width=51, height=57

what is wrong here?

Cheers, Hanna