Based on mechanical features of controlled driving component and the characteristic of controlled mechanism of two degrees of freedom,a circle fitting optimization model of controlled mechanism which accurately realize the track of many points has been established.

The least-squares method of circle fitting of error vertical hole on slice images is presented based on matter of fact,and the contour fitted is tracked by single pels.

A circle fitting algorithm based on conformal geometric algebra is introduced.

To avoid these defects,using elliptic fitting technique,a non-contact real-time measurement system based on grid strain was established.

Application of Arc Fitting in NC Machining of Noncircular Profile Curve;

In order to enhance tooth form precision of hobbing and shaving cutter, arc fitting method has been applied to tooth form manufacturing of involute worm in the investigation of gear hobbing and shaving cutter with big modular, hard face, and high precision.

Optimal ellipse fitting method based on least-square principle;

Face tracking algorithm based on mean shift and ellipse fitting;

Application of ellipse fitting method to calibration of magnetic compass deviation

To improve the precision of cylinder fitting,aiming at the trait of ancient building emulation,a robust cylinder fitting method was put forward,which at first got initial cylinder parameter values by Gauss image,then fit cylinder by nonlinear least squares for parameterized distance function.

To improve the precision of cylinder fitting ,aiming at the trait of ancient building emulation, a robust cylinder fitting method is put forward, which at first gets initial cylinder parameter values by Gauss Image, then fits cylinder by Nonlinear Least Squares for parameterized distance function.