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Orientation Measurement for Objects with Planar Surface Based on Monocular Microscopic Vision

  • Ying Li
  • Xi-Long Liu
  • De XuEmail author
  • Da-Peng Zhang
Research Article

Abstract

Orientation measurement of objects is vital in micro assembly. In this paper, we present a novel method based on monocular microscopic vision for 3-D orientation measurement of objects with planar surfaces. The proposed methods aim to measure the orientation of the object, which does not require calibrating the intrinsic parameters of microscopic camera. In our methods, the orientation of the object is firstly measured with analytical computation based on feature points. The results of the analytical computation are coarse because the information about feature points is not fully used. In order to improve the precision, the orientation measurement is converted into an optimization process base on the relationship between deviations in image space and in Cartesian space under microscopic vision. The results of the analytical computation are used as the initial values of the optimization process. The optimized variables are the three rotational angles of the object and the pixel equivalent coefficient. The objective of the optimization process is to minimize the coordinates differences of the feature points on the object. The precision of the orientation measurement is boosted effectively. Experimental and comparative results validate the effectiveness of the proposed methods.

Keywords

Microscopic vision micro assembly orientation measurement optimization analytical computation 

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Notes

Acknowledgments

This work was supported by National Natural Science Foundation of China (Nos. 61733004 and 61873266).

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Copyright information

© Institute of Automation, Chinese Academy of Sciences and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Research Center of Precision Sensing and Control, Institute of AutomationChinese Academy of SciencesBeijingChina
  2. 2.School of Computer and Control EngineeringUniversity of Chinses Academy of SciencesBeijingChina

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