In the inspection of cracks by structural health monitoring system, it is common to acquire 2D images. However, when the target is a thick crack, it is difficult to identify the width of the crack, especially if the positional relationship between the lighting and the camera is not sufficiently taken into account. On the other hand, since infrastructure inspection vehicles are being put into practical use, it is necessary to identify crack widths even with 2D images. Therefore, this study proposes a method to calculate the crack width by image processing using chalk-marks drawn during visual inspection of wide cracks in 2D images acquired by a structural health monitoring system while traveling at high speed. Experiments showed that the proposed method can detect cracks within a margin of error of 10 to 15%, while conventional crack detection software cannot calculate the width.
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