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http://dx.doi.org/10.12814/jkgss.2021.20.4.063

A Study on Applicability of Smartphone Camera and Lens for Concrete Crack Measurement Using Image Processing Techniques  

Seo, Seunghwan (Korea Institute of Civil Engineering and Building Technology(KICT))
Kim, Dong-Hyun (AICLOPS Inc.)
Chung, Moonkyung (KICT.)
Publication Information
Journal of the Korean Geosynthetics Society / v.20, no.4, 2021 , pp. 63-71 More about this Journal
Abstract
Recently, high-resolution cameras in smartphones enable measurement of minute objects such as cracks in concrete using image processing techniques. The technology to investigate the crack width using an application at an adjacent distance of the close shot range has already been implemented, but the use is limited, so it is necessary to verify the usability of the high-resolution smartphone camera to measure cracks at a longer distance. This study focuses on recognizing the size of subdivided crack widths at a thickness within 1.0 mm of crack width at a distance of 2 m. In recent Android-based smartphones, an experiment was conducted focusing on the relationship between the unit pixel size, which is a measurement component, and the shooting distance, depending on the camera resolution. As a result, it was possible to confirm the necessity of a smartphone lens for the classification and quantification of microcrack widths of 0.3 mm to 1mm. The universal telecentric lens for smartphones needed to be installed in an accurate position to minimize the effect of distortion. In addition, as a result of applying a 64 MP high-resolution smartphone camera and double magnification lens, the crack width could be calculated within 2 m in pixel units, and crack widths of 0.3, 0.5, and 1mm could be distinguished.
Keywords
Concrete crack; Image processing; Smartphone; Smartphone telephoto lens;
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Times Cited By KSCI : 1  (Citation Analysis)
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