Circular fringe center location based on local gradient direction estimation

Fuzhong Bai; Xiaohua Zhang; Jun Kong; Xiaojuan Gao; Yongxiang Xu

doi:10.1117/12.2604827

13 December 2021 Circular fringe center location based on local gradient direction estimation

Fuzhong Bai, Xiaohua Zhang, Jun Kong, Xiaojuan Gao, Yongxiang Xu

Proceedings Volume 12071, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing and Metrology Technologies; 120710J (2021) https://doi.org/10.1117/12.2604827
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

A method based on the local gradient direction information is proposed to locate the center of circular fringe. The new method is developed which based on the idea that the normal directions of any point on the circular fringe are always pointing towards the center. Besides, the local gradient direction of fringe is related to the normal line of fringe. We deduce theoretically the principle of local gradient direction estimation. Then a new circular fringe center location algorithm is developed with the help of digital image processing technology and statistical ideas. The simulation results show that new method can locate accurately the center of different types of circular fringes with less or without filtering. It also holds good robustness and can meet the requirements of actual engineering application.

Citation Download Citation

Fuzhong Bai, Xiaohua Zhang, Jun Kong, Xiaojuan Gao, and Yongxiang Xu "Circular fringe center location based on local gradient direction estimation", Proc. SPIE 12071, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing and Metrology Technologies, 120710J (13 December 2021); https://doi.org/10.1117/12.2604827

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