Package georegression.fitting.curves

Class RefineEllipseEuclideanLeastSquares_F64

java.lang.Object

georegression.fitting.curves.RefineEllipseEuclideanLeastSquares_F64

public class RefineEllipseEuclideanLeastSquares_F64
extends 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	Description
class	RefineEllipseEuclideanLeastSquares_F64.EllipseError
class	RefineEllipseEuclideanLeastSquares_F64.Jacobian

Field Summary

Fields

Modifier and Type	Field	Description
protected UnconstrainedLeastSquares<org.ejml.data.DMatrixRMaj>	optimizer

Constructor Summary

Constructors

Constructor	Description
RefineEllipseEuclideanLeastSquares_F64()	Defaults to a robust solver since this problem often encounters singularities.
RefineEllipseEuclideanLeastSquares_F64(UnconstrainedLeastSquares<org.ejml.data.DMatrixRMaj> optimizer)

Method Summary

Modifier and Type	Method	Description
protected RefineEllipseEuclideanLeastSquares_F64.EllipseError	createError()
protected RefineEllipseEuclideanLeastSquares_F64.Jacobian	createJacobian()
double	getFitError()
EllipseRotated_F64	getFound()
UnconstrainedLeastSquares	getOptimizer()
boolean	refine(EllipseRotated_F64 initial, List<Point2D_F64> points)
void	setFtol(double ftol)
void	setGtol(double gtol)
void	setMaxIterations(int maxIterations)

Methods inherited from class java.lang.Object

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

Field Details

optimizer

protected UnconstrainedLeastSquares<org.ejml.data.DMatrixRMaj> optimizer

Constructor Details

RefineEllipseEuclideanLeastSquares_F64

public RefineEllipseEuclideanLeastSquares_F64(UnconstrainedLeastSquares<org.ejml.data.DMatrixRMaj> optimizer)

RefineEllipseEuclideanLeastSquares_F64

public RefineEllipseEuclideanLeastSquares_F64()

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

Method Details

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,
 List<Point2D_F64> points)

getFound

public EllipseRotated_F64 getFound()

getFitError

public double getFitError()

createError

protected RefineEllipseEuclideanLeastSquares_F64.EllipseError createError()

createJacobian

protected RefineEllipseEuclideanLeastSquares_F64.Jacobian createJacobian()