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http://dx.doi.org/10.3741/JKWRA.2012.45.12.1227

A Novel Water Surface Detection Method Based on Correlation Analysis for Rectangular Control Area  

Lee, Chan Joo (River and Coastal Research Division, Korea Institute of Construction Technology)
Seo, Myoung Bae (ICT Convergence and Integration Research Division, Korea Institute of Construction Technology)
Kim, Dong Gu (River and Coastal Research Division, Korea Institute of Construction Technology)
Kwon, Sung Il (River and Coastal Research Division, Korea Institute of Construction Technology)
Publication Information
Journal of Korea Water Resources Association / v.45, no.12, 2012 , pp. 1227-1241 More about this Journal
Abstract
In this study, a novel water surface detection method was proposed. In the method water surface is detected by analysis on correlation coefficients obtained from rectangular control areas of the same vertical position in two successive images including both water surface and staff gauge. Four methods respectively based on threshold, peak, slope and variance ratio, are used to identify water surface from vertical distribution of correlation coefficient. In addition, swaying correction algorithm and statistical filtering are applied to minimize outliers caused by positional image mismatch. Images taken from 28 different sites during low flow were tested to evaluate the method. Mean relative error to eye measurement was approximately from 3.4 to 5.7 cm. As long as water surface moves, this method can be used to improve image stage gauge by supplementing the previous water surface detection method.
Keywords
image stage gauge; image; correlation coefficient; control area; water surface detection;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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