An Improved Adaptive Width Template Method for Crack Detection of Nuclear Containments
Publication: Journal of Surveying Engineering
Volume 143, Issue 4
Abstract
As an external defect, cracks cannot be neglected, and crack detection is crucial for the safety monitoring of nuclear containments. Because of the low continuity and tiny size of cracks, traditional crack-detection methods sometimes fail to detect cracks in complex backgrounds. This paper proposes a crack-detection method featuring a template that can adaptively determine the crack width. The search starts from the local minimum point of the gray level, and the crack width is determined by comparing the gray difference between the seed region and its neighborhoods on a pixel basis. Then, the block-iterative algorithm is used to intersect with the results of the template method followed by the morphological method for further noise removal. Compared with the traditional methods, the developed method can detect tiny cracks with a higher recognition ratio. The applicability of this method was verified by experiments from a nuclear containment in southern China.
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Acknowledgments
This work was supported by the Open Foundation of Key Laboratory for Urban Geomatics of the National Administration of Surveying, Mapping and Geoinformation (20131205WY), 2014 Basic Surveying and Mapping Project of National Administration of Surveying, Mapping and Geoinformation (“Research on the PS Technology Used in GB-SAR Data Processing”), and the Open Foundation of Key Laboratory of Precise Engineering and Industry Surveying of the National Administration of Surveying, Mapping and Geoinformation (PF2015-1). Yaming Xu designed the image-acquisition mode. Cheng Xing collected images for the experiments. Peng Tian proposed the idea for the method. Jingjing Huang realized the method and performed the experiments of the method. This paper was written by Jingjing Huang and Peng Tian. All authors read and approved the final paper.
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Published In
Journal of Surveying Engineering
Volume 143 • Issue 4 • November 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: May 3, 2016
Accepted: Feb 8, 2017
Published online: May 26, 2017
Discussion open until: Oct 26, 2017
Published in print: Nov 1, 2017
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