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Optical Engineering

Center searching and tracking of circular interference fringes for precision measurement
Author(s): Yan Li; Shiliang Qu; Jian Qu; Zhi-Yong Luo
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Paper Abstract

We report an algorithm for searching and tracking the center of the circular interference fringes. The algorithm was programmed by VB.NET for processing the interference images captured by CCD camera. Images were changed into binary gray-level format by the Otsu method. The circular scanning method was used to extract the outline of circular interference fringes, and then the coordinates of the perpendicular subtenses were used to remove noise pixels. Finally, the coordinate of the center was calculated by statistical method. The experimental results are in good agreement with the simulation images. The algorithm had subpixel accuracy and anti-noise ability. Thus, the algorithm can be used in accurate measurement for its automatic processing ability.

Paper Details

Date Published: 2 March 2012
PDF: 5 pages
Opt. Eng. 51(2) 027003 doi: 10.1117/1.OE.51.2.027003
Published in: Optical Engineering Volume 51, Issue 2
Show Author Affiliations
Yan Li, Harbin Institute of Technology (China)
Shiliang Qu, Harbin Institute of Technology (China)
Jian Qu, Harbin Institute of Technology (China)
Zhi-Yong Luo, National Institute of Metrology (China)

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