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Branch cutting algorithm for unwrapping photoelastic phase map with isotropic point

Zhang, Yao Ting; Huang, Min Jui; Liang, Hua Rong; Lao, Fu You; Wedowski, Raphael; Atkinson, Gary; Smith, Melvyn; Smith, Lyndon


Yao Ting Zhang

Min Jui Huang

Hua Rong Liang

Fu You Lao

Raphael Wedowski

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Melvyn Smith
Research Centre Director Vision Lab/Prof

Lyndon Smith
Professor in Computer Simulation and Machine


A branch cutting algorithm is proposed to solve the wrapped isoclinic causing isochromatic discontinuity and thus to decouple the isoclinicisochromatic interaction of photoelastic phase maps. Rather than pixel by pixel, the branch-cutting isoclinic wrapped map is then restored by a modified regional approach and is proved to be more time-effective and less effort needed than the authors earlier algorithm. The decoupled isochromatic data can be handled easily afterward. Two type of simulated samples (i.e., specimens with and without isotropic points) are used to detail why and how isoclinic and isochromatic are interactive with each other and the decoupling method of the present study. Experimental works prove the effectiveness, robustness and simplicity of the newly developed algorithm. © 2011 Elsevier Ltd. All rights reserved.


Lao, F. Y., Liang, H. R., Huang, M. J., Zhang, Y. T., Wedowski, R., Atkinson, G., …Smith, L. (2012). Branch cutting algorithm for unwrapping photoelastic phase map with isotropic point. Optics and Lasers in Engineering, 50(5), 619-631.

Journal Article Type Article
Publication Date May 1, 2012
Journal Optics and Lasers in Engineering
Print ISSN 0143-8166
Publisher Elsevier
Peer Reviewed Not Peer Reviewed
Volume 50
Issue 5
Pages 619-631
Keywords specular freeformsurfaces, dynamic inspection, defect detection, multi-scale lineextraction, algorithm
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