A robust automatic crack detection method from noisy concrete surfaces |
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Authors: | Yusuke Fujita Yoshihiko Hamamoto |
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Affiliation: | (1) Institut Telecom; Telecom Lille1, LIFL CNRS, Lille, France;(2) Facult? des Sciences, GSCM/LRIT, Rabat, Morocco;(3) Department of Statistics, Florida State University, Tallahassee, FL 32306, USA |
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Abstract: | In maintenance of concrete structures, crack detection is important for the inspection and diagnosis of concrete structures.
However, it is difficult to detect cracks automatically. In this paper, we propose a robust automatic crack-detection method
from noisy concrete surface images. The proposed method includes two preprocessing steps and two detection steps. The first
preprocessing step is a subtraction process using the median filter to remove slight variations like shadings from concrete
surface images; only an original image is used in the preprocessing. In the second preprocessing step, a multi-scale line
filter with the Hessian matrix is used both to emphasize cracks against blebs or stains and to adapt the width variation of
cracks. After the preprocessing, probabilistic relaxation is used to detect cracks coarsely and to prevent noises. It is unnecessary
to optimize any parameters in probabilistic relaxation. Finally, using the results from the relaxation process, a locally
adaptive thresholding is performed to detect cracks more finely. We evaluate robustness and accuracy of the proposed method
quantitatively using 60 actual noisy concrete surface images. |
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