This paper has studied a measurement method of geometric parameters of fiber which is ellipse twin-core fiber based on machine vision. Firstly, testing system does grey histogram of fiber end image and does binary image to extract cladding and air holes and then obtains coordinates of radius and center of cladding and air holes through Hough transform. Secondly, it obtains a image of two ellipse cores by increasing threshold and making fiber end binary, extracts contour of two ellipse cores applying edge chain code method, and then calculates coordinates of semi-minor axis, semi-major axis and center of two ellipse cores by using least squares fitting. The measuring accuracy of the method achieves 1 μm, it can meet the requirement of performance test and analysis of this microstructure fiber.

Date Published: 28 November 2011
PDF: 11 pages
Proc. SPIE 8200, 2011 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Processing Technology, 82001E (28 November 2011); doi: 10.1117/12.906691

Published in SPIE Proceedings Vol. 8200:
2011 International Conference on Optical Instruments and Technology: Optoelectronic Imaging and Processing Technology
Toru Yoshizawa; Ping Wei; Jesse Zheng, Editor(s)