Is there any way of determining how accurate fitellipse is?

Hi,

I'm trying to use the cvfitellipse to fit ellipses around rings of
light which are at different angles but to make sure it's accurate
enough I need to work out how big the error is between the original
set of points and the ellipse being fitted, I've tried to think of
ways to do this and I've looked through the ellipse fitting stuff but
so far no luck.

Anyone got any ideas?

Thanks for any help you can give me!








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