Center searching and tracking of circular interference fringes for precision measurement

Yan Li; Shiliang Qu; Jian Qu; Zhi-Yong Luo

doi:10.1117/1.OE.51.2.027003

2 March 2012 Center searching and tracking of circular interference fringes for precision measurement

Yan Li, Shiliang Qu, Jian Qu, Zhi-Yong Luo

Author Affiliations +

Optical Engineering, Vol. 51, Issue 2, 027003 (March 2012). https://doi.org/10.1117/1.OE.51.2.027003

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.

Citation Download Citation

Yan Li, Shiliang Qu, Jian Qu, and Zhi-Yong Luo "Center searching and tracking of circular interference fringes for precision measurement," Optical Engineering 51(2), 027003 (2 March 2012). https://doi.org/10.1117/1.OE.51.2.027003

Published: 2 March 2012

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