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A Study for Introducing a Method of Detecting and Recovering the Shadow Edge from Aerial Photos  

Jung, Yong-Ju (전북대학교 공과대학 토목공학과)
Jang, Young-Woon (전북대학교 공과대학 토목공학과)
Choi, Yun-Woong (전북대학교 공과대학 토목공학과)
Cho, Gi-Sung (전북대학교 공과대학 토목공학과)
Publication Information
Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography / v.24, no.4, 2006 , pp. 327-334 More about this Journal
Abstract
The aerial photos need in a simple object such as cartography and ground cover classification and also in a social objects such as the city plan, environment, disaster, transportation etc. However, the shadow, which includes when taking the aerial photos, makes a trouble to interpret the ground information, and also users, who need the photos in their field tasks, have a restriction. Generally the shadow occurs by the building and surface topography, and the detail cause is by changing of the illumination in an area. For removing the shadow this study uses the single image and processes the image without the source of image and taking situation. Also, applying the entropy minimization method it generates the 1-D gray-scale invariant image for creating the shadow edge mask and using the Canny edge detection creates the shadow edge mask, and finally by filtering in Fourier frequency domain creates the intrinsic image which recovers the 3-D color information and removes the shadow.
Keywords
Aerial Photos; Shadow; Entropy Minimization; Invariant Images; Intrinsic Images;
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