georegression.fitting.ellipse

Class RefineEllipseEuclideanLeastSquares

java.lang.Object

georegression.fitting.ellipse.RefineEllipseEuclideanLeastSquares

public class RefineEllipseEuclideanLeastSquares
extends java.lang.Object

Minimizes the Euclidean distance between an ellipse and a set of points which it has been fit to. Minimization is done using a user configurable unconstrained optimization algorithm. The error for each observation 'i' is computed using the following equation:
[x,y] = [p_x,p_y] - ([x_0,y_0] - a*R*X)
where R = [cos(phi),-sin(phi);sin(phi),cos(phi)] and X = [a*cos(theta),b*sin*(theta)], where theta is the angle of the closest point on the ellipse for the point.

NOTE: This implementation does not take advantage of the sparsity found in the Jacobian. Could be speed up a bit.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	RefineEllipseEuclideanLeastSquares.Error
class	RefineEllipseEuclideanLeastSquares.Jacobian

Constructor Summary

Constructors

Constructor and Description
RefineEllipseEuclideanLeastSquares() Defaults to a robust solver since this problem often encounters singularities.
RefineEllipseEuclideanLeastSquares(UnconstrainedLeastSquares optimizer)

Method Summary

Modifier and Type	Method and Description
double	getFitError()
EllipseRotated_F64	getFound()
UnconstrainedLeastSquares	getOptimizer()
boolean	refine(EllipseRotated_F64 initial, java.util.List<Point2D_F64> points)
void	setFtol(double ftol)
void	setGtol(double gtol)
void	setMaxIterations(int maxIterations)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RefineEllipseEuclideanLeastSquares

public RefineEllipseEuclideanLeastSquares(UnconstrainedLeastSquares optimizer)

RefineEllipseEuclideanLeastSquares

public RefineEllipseEuclideanLeastSquares()

Defaults to a robust solver since this problem often encounters singularities.

Method Detail

setFtol

public void setFtol(double ftol)

setGtol

public void setGtol(double gtol)

setMaxIterations

public void setMaxIterations(int maxIterations)

getOptimizer

public UnconstrainedLeastSquares getOptimizer()

refine

public boolean refine(EllipseRotated_F64 initial,
                      java.util.List<Point2D_F64> points)

getFound

public EllipseRotated_F64 getFound()

getFitError

public double getFitError()