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http://dx.doi.org/10.7843/kgs.2007.23.12.109

Analysis of Digital Vision Measurement Resolution by Influence Parameters  

Kim, Kwang-Yeom (Underground Structure Research Div. Korea Institute of Construction Technology)
Kim, Chang-Yong (Underground Structure Research Div. Korea Institute of Construction Technology)
Lee, Seung-Do (Civil Engrg. Team, Samsung Corporation)
Lee, Chung-In (Seoul National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.23, no.12, 2007 , pp. 109-116 More about this Journal
Abstract
This study has reviewed the applicability of displacement measurement by using a digital vision technique based on typical photogrammetric methods. In this study, a series of experimental measurements have been performed in order to improve the accuracy of digital vision measurement by establishing criteria of factors of various vision measurements. It is found that the digital vision measurement tends to show higher accuracy as the image size(resolution) and the focal length become larger and the distance to an object becomes closer. It is also observed that measurement error decreases with processing as many images as possible in various angles. Applicability on high-resolution displacement measurement is proved by applying the digital vision measurement developed in this study to a large scale loading test of concrete lining.
Keywords
Digital vision measurement; Measurement error; Measurement of displacement;
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