EllipseImageFit:

Path: Imaging/ImageMatching

% Fit an ellipse to point data.
   The ellipse is ax^2 + bxy + cy^2 + dx + ey + f = 0;
   The output vector is [a;b;c;d;e;f];
   The output vector is good to within a scale factor.
   If r is entered it will do an additional minimization using a as the 
   starting vector using fminsearch.

   Since version 8.
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   Form:
                  EllipseImageFit;
   aR           = EllipseImageFit( x, y )
   [aR, a, err] = EllipseImageFit( x, y, r )
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   ------
   Inputs
   ------
   x              (1,:)        x values
   y              (1,:)        y values
   r              (1,1)        If entered fit using downhill simplex

   -------
   Outputs
   -------
   aR             (1,6)	    [a;b;c;d;e;f] robust fit
   a              (1,6)	    [a;b;c;d;e;f] regular fit
   err            (1,1)        Error

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   Reference: Trucco, E. and A. Verri, "Introductory Techniques for 3-D
              Computer Vision, Prentice-Hall, 1998, p. 103-107.
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