Electronic Science and Technology ›› 2022, Vol. 35 ›› Issue (3): 16-24.doi: 10.16180/j.cnki.issn1007-7820.2022.03.003

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Multi-Line Structured Light Centerline Extraction Method Based on System Space Structure Constraints

Xueyi MAO,Wenguo LI   

  1. Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China
  • Received:2020-11-07 Online:2022-03-15 Published:2022-04-02
  • Supported by:
    National Natural Science Foundation of China(51865020)


The linear structured light measurement system is easy to be disturbed by ambient light, which affects the extraction of the center line of the fringe. Based on the analysis of the spatial structure constraints of the system, this study presents a method to extract the center line of multi-line structural light stripes. The extraction method is divided into two stages: calibration and measurement. In the calibration phase, the offset and offset coefficient of the center line are calculated. In the measurement stage, the three-dimensional world coordinates of the stripe center line are obtained with and without ambient light, respectively. The experimental accuracy is measured by plane and surface fitting and compared with Steger algorithm. The experimental results show that in the presence of ambient light, the error of skew plane fitting is less than 0.007 mm, and the percentage relative error of surface fitting is less than 1.2%. In the absence of ambient light, the relative error of cylinder height fitting is less than 0.7%. The above results indicate that the accuracy of the proposed algorithm is better than that of the Steger algorithm.

Key words: linear structured light, the ambient light, stripe center line, system space structure constraints, multi-line structured light stripe, the offset, the offset coefficient, plane fitting, surface fitting

CLC Number: 

  • TN249