Practical image measurement of crack width for real concrete structure

Tomoyuki Yamaguchi*, Shuji Hashimoto


    研究成果: Article査読

    33 被引用数 (Scopus)


    Crack width is an important data item in inspection and diagnosis for the safety management of concrete structures. Usually the crack width measurement is performed manually by specialists using a crack scale. However, it takes a long time and lacks the objectivity needed for quantitative analysis. Therefore, the importance of image processing for visual inspection has been increasing in civil and construction engineering. Recently, many methods for crack width measurement have been proposed. We have already tried to measure crack width utilizing image processing. However, these methods have concentrated only on the application to test specimens. In this paper, we propose an improved image measurement method for crack width determination, intended for application to real concrete structures. In our method, a crack scale is applied to the concrete surface for image acquisition. The crack width is measured by the brightness of the crack scale areas on the image with sub-pixel order accuracy. In the real world, the lighting conditions differ in various environments. To deal with such differences, this paper clarifies the conditions of effectiveness of our method for practical use. The validity of the proposed technique is investigated by experiments with images of a real concrete surface.

    ジャーナルElectronics and Communications in Japan
    出版ステータスPublished - 2009 10月

    ASJC Scopus subject areas

    • 電子工学および電気工学
    • コンピュータ ネットワークおよび通信
    • 物理学および天文学(全般)
    • 信号処理
    • 応用数学


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