가시-근적외선(VNIR) 초분광 영상을 활용한 흑색오염물 세척효과 비교 고찰
Consideration on the Cleaning Effect of Black Contaminants using Visible-Near-Infrared (VNIR) Hyperspectral Images
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초록
가시-근적외선(VNIR) 초분광 영상은 전처리 없이 세척 전⋅후 등 색상변화를 수반하는 상황 에 대한 분석이 가능하다. 이 연구에서는 VNIR 초분광 시스템을 적용하여 원주 법천사지 지광국사 탑의 상층기단석 표면에 발생한 흑색오염물을 대상으로 레이저 세척 전⋅후를 비교 분석하였다. VNIR 초분광 영상의 적용성을 검토하기 위하여 사전 실험을 선행하였고, 이후 4면(동, 서, 남, 북)을 대상으로 VNIR 초분광 영상을 촬영하였다. 823 nm 대역의 밴드 영상을 활용하여 변화탐지 기법인 영상차를 통해 세척 전⋅후를 비교한 결과, 세척이 수행된 면적뿐만 아니라 변화량까지 산출할 수 있었으며, VNIR 초분광 시스템을 활용한 영상분석이 세척 전⋅후 비교에 효과적임을 알 수 있었다.
Abstract
VNIR hyperspectral images can be analyzed in situations involving color changes, such as before and after cleaning, without pre-treatment. In this study, to analyze the application of the VNIR hyperspectral system, we compared the black contaminants on the surface of the Jigwangguksa Pagoda upper stereobate at Beopcheonsa Temple, Wonju before and after cleaning with laser. After a preliminary experiment to evaluate the applicability of VNIR hyperspectral imaging, we took images of the four sides (north, south, east, and west). The 823 nm band image was used for comparing before and after cleaning. As per the result of the image differencing analysis about before and after cleaning, the spectral reflectance of the area where the cleaning was performed showed a tendency to increase. Additionally, it was found that not only the washed area but also the extent of change could be calculated through monochrome for quantitative comparison, and imaging analysis using the VNIR hyperspectral system was sufficiently effective for comparison before and after cleaning.
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