Computer Science

Computer Science ›› 2021, Vol. 48 ›› Issue (11A): 166-169.doi: 10.11896/jsjkx.201100057

• Intelligent Computing • Previous Articles     Next Articles

Spatial Cylinder Fitting Based on Projection Roundness and Genetic Algorithm

GAO Shuai, XIA Liang-bin, SHENG Liang, DU Hong-liang, YUAN Yuan, HAN He-tong   

  1. Northwest Institute of Nuclear Technology,Xi'an 710024,China
  • Online:2021-11-10 Published:2021-11-12
  • About author:GAO Shuai,born in 1988,postgraduate,engineer.His main research interests include precision measurement and mechanical design.
  • Supported by:
    National Natural Science Foundation of China (11275151,11535010).

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Abstract: In order to solve the problem of strong nonlinearity,poor robustness and weak stability of spatial cylindrical surface,a method of fitting spatial cylindrical surface based on projection roundness and genetic algorithm is proposed.First of all,the projection roundness of a cylindrical surface on a plane is calculated by coordinate transformation.Then,the normal vectors of the plane in which the optimal projection roundness lies are searched quickly by means of the global optimization characteristic of genetic algorithm,and then the radius and axis equation of the cylindrical surface in space are calculated by plane projection.Finally,the inverse coordinate transformation is used to obtain the spatial cylindrical surface feature parameters under the original coordinates.Since the projection roundness of the cylindrical surface is only related to the direction angle of the normal vector of the projection plane,the solution space can cover all the spatial cylindrical surface of the pose only by reasonably setting the range of the direction angle of the normal vector.In addition,the genetic algorithm has good global optimization and convergence,and can achieve good results in spatial cylindrical surfaces and such multivariable nonlinear optimization problems.Simulation experiments and practical applications show that compared with the traditional fitting method,the spatial cylindrical fitting method based on projection roundness and genetic algorithm has the advantages of no need to estimate initial value,strong robustness,high fitting precision and good stability.This algorithm is an effective method to achieve cylinder fitting of arbitrary pose space.

Key words: Conicoid fitting, Genetic algorithm, Projection roundness, Spatial cylinder

CLC Number: 

  • TP272
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