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http://dx.doi.org/10.12673/jant.2019.23.5.400

Shadow Reconstruction Based on Intrinsic Image and Multi-Scale Gamma Correction for Aerial Image Analysis  

Park, Ki-hong (Division of Convergence Computer & Media, Mokwon University)
Publication Information
Journal of Advanced Navigation Technology / v.23, no.5, 2019 , pp. 400-407 More about this Journal
Abstract
In this paper, the shadow detection and reconstruction method are proposed using intrinsic image, which does not change the essential characteristics under the influence of various illuminance, and multi-scale gamma correction. The shadow detection was estimated by the pixel change information between a grayscale and an intrinsic image of the color image, and the brightness of the image were adjusted by gamma correction in the shadow restoration process. Multi-scale gamma correction is performed for each channel of a color image due to the fact that the saturation can be changed by nonlinear adjustment to individual pixel values. Multi-scale gamma values are estimated based on the information of the crossed edge between shadows and non-shadowed regions in the color image, as a result, the shadows are reconstructed by correcting different region features with multi-scale gamma values. Experimental results show that the proposed method effectively reconstructs shadows in a single natural image.
Keywords
Multi-scale gamma correction; Intrinsic image; Shadow detection; Shadow reconstruction; Shadow removal;
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