...used.
Experiments showed that it was preferable to use the intrinsic parameters of the ellipse rather than their corresponding conic coefficients [ 11 ]. Their values tend to lie in a smaller range than the coefficients, and are invariant to translation and rotation of the data. Therefore all the methods described in this paper use intrinsic parameters rather than conic coefficients.

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...point
An estimator's breakdown point is defined as the percentage of outliers that may force the estimator to return a value arbitrarily larger than the correct result.

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Paul L Rosin
Fri Jun 20 15:05:52 BST 1997