The Method of Spatial Circle Fitting Based on SVD Registration
In order to solve the problems of low precision and unstable method of traditional spatial circle fitting method,a SVD algorithm is proposed to calculate rotation,translation and scale parameters which calculate the radius,the center of position,roundness and flatness of the spatial circle.Compared with the method of least square,the SVD algorithm does not need iterative calculation and only require one initial values of scale factor to calculate spatial shape parameters,which is more efficiently.To guarantee the precision of result,the posterior probability of mean shift is used to achieve to detect gross error and the algorithm is used to verify the feasibility and reliability,combined with measuring the steel rings project of subway tunnel portal.
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