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Color Demosaicing Algorithm Considering Color Constancy  

Kim, Chang-Won (Institute of TMS Information Technology, Yonsei University)
Oh, Hyun-Mook (Institute of TMS Information Technology, Yonsei University)
Kang, Moon-Gi (Institute of TMS Information Technology, Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.47, no.3, 2010 , pp. 1-10 More about this Journal
Abstract
In this paper, we propose a novel way of combining color demosaicing and the auto white balance (AWB) method, which are important parts of image processing. Performance of the AWB is generally affected by demosaicing results because most AWB algorithms are performed posterior to color demosaicing. In order to increase the performance and efficiency of the AWB algorithm, the color constancy problem is considered during the color demosaicing step. Initial estimates of the directional luminance and chrominance values are defined for estimating edge direction and calculating the AWB gain. We propose a modified edge-based AWB method that used a pre-defined achromatic region. The estimation of edge direction is performed region adaptively by using the local statistics of the initial estimates of the luminance and chrominance information. The proposed method shows significant improvements in terms of visual and numerical criteria when compared to conventional methods.
Keywords
AWB;
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