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http://dx.doi.org/10.5573/ieek.2013.50.7.205

A Deblurring Algorithm Combined with Edge Directional Color Demosaicing for Reducing Interpolation Artifacts  

Yoo, Du Sic (Department of Electrical and Electronic Engineering, Yonsei University)
Song, Ki Sun (Department of Electrical and Electronic Engineering, Yonsei University)
Kang, Moon Gi (Department of Electrical and Electronic Engineering, Yonsei University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.50, no.7, 2013 , pp. 205-215 More about this Journal
Abstract
In digital imaging system, Bayer pattern is widely used and the observed image is degraded by optical blur during image acquisition process. Generally, demosaicing and deblurring process are separately performed in order to convert a blurred Bayer image to a high resolution color image. However, the demosaicing process often generates visible artifacts such as zipper effect and Moire artifacts when performing interpolation across edge direction in Bayer pattern image. These artifacts are emphasized by the deblurring process. In order to solve this problem, this paper proposes a deblurring algorithm combined with edge directional color demosaicing method. The proposed method is consisted of interpolation step and region classification step. Interpolation and deblurring are simultaneously performed according to horizontal and vertical directions, respectively during the interpolation step. In the region classification step, characteristics of local regions are determined at each pixel position and the directionally obtained values are region adaptively fused. Also, the proposed method uses blur model based on wave optics and deblurring filter is calculated by using estimated characteristics of local regions. The simulation results show that the proposed deblurring algorithm prevents the boosting of artifacts and outperforms conventional approaches in both objective and subjective terms.
Keywords
Deblurring; Color Filter array(CFA); Demosaicing; Bayer pattern; Optical transfer function;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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