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Edge-Directed Color Interpolation on Disjointed Color Filter Array  

Oh, Hyun-Mook (Institute of TMS Information Technology, Yonsei University)
Yoo, Du-Sic (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.1, 2010 , pp. 53-61 More about this Journal
Abstract
In this paper, we present a color interpolation algorithm that uses novel edge direction estimator and region classifier. The proposed edge direction estimator accurately determines the edge direction based on the correlation between the images obtained by the channel separated and down-sampled Bayer color filter array(CFA) pattern. The correlation is defined based on the similarity between the edge direction in the local region of the image and the shifting direction of the images. Also, the region of an image is defined as the flat, the edge, and the pattern-edge regions, where the edges are appeared repeatedly. When all the pixels in the image are classified into the three different regions, each pixel is interpolated horizontally or vertically according to the estimated direction. Experimental results show that the proposed algorithm outperforms the conventional edge-directed methods on objective and subjective criteria.
Keywords
Color Filter array(CFA); Demosaicing; Bayer pattern; Region classification;
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