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http://dx.doi.org/10.5909/JBE.2013.18.4.619

An Edge Directed Color Demosaicing Algorithm Considering Color Channel Correlation  

Yoo, Du Sic (Department of Electrical and Electronic Engineering, Yonsei University)
Lee, Min Seok (Department of Electrical and Electronic Engineering, Yonsei University)
Kang, Moon Gi (Department of Electrical and Electronic Engineering, Yonsei University)
Publication Information
Journal of Broadcast Engineering / v.18, no.4, 2013 , pp. 619-630 More about this Journal
Abstract
In this paper, we propose an edge directed color demosaicing algorithm considering color channel correlation. The proposed method consists of local region classification step and edge directional interpolation step. In the first step, each region of a given Bayer image is classified as normal edge, pattern edge, and flat regions by using intra channel and inter channel gradients. Especially, two criteria and verification process for the normal edge and pattern edge classification are used to reduce edge direction estimation error, respectively. In the second step, edge directional interpolation process is performed according to characteristics of the classified regions. For horizontal and vertical directional interpolations, missing color components are obtained from interpolation equations based on intra channel and inter channel correlations in order to improve the performance of the directional interpolations. The simulation results show that the proposed algorithm outperforms conventional approaches in both objective and subjective terms.
Keywords
demosaicing; color interpolation; Bayer pattern; color filter array(CFA); edge classification;
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