Editing Curve fitting (section)

===Fitting a circle by geometric fit{{anchor|Circles}}===
[[File:Regression circulaire coope arc de cercle.svg|thumb|Circle fitting with the Coope method, the points describing a circle arc, centre (1 ; 1), radius 4.]]
[[File:Wp ellfitting.png|thumb|different models of ellipse fitting]]
[[File:Regression elliptique distance algebrique donnees gander.svg|thumb|Ellipse fitting minimising the algebraic distance (Fitzgibbon method).]]

Coope<ref>{{cite journal|author=Coope, I.D.|title=Circle fitting by linear and nonlinear least squares|journal=Journal of Optimization Theory and Applications |volume =76|issue =2|year=1993|doi=10.1007/BF00939613|pages=381–388|hdl=10092/11104|s2cid=59583785 |hdl-access=free}}</ref> approaches the problem of trying to find the best visual fit of circle to a set of 2D data points. The method elegantly transforms the ordinarily non-linear problem into a linear problem that can be solved without using iterative numerical methods, and is hence much faster than previous techniques.