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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(4):978-986; doi:10.1093/ietfec/e91-a.4.978
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Selected Papers from the 20th Workshop on Circuits and Systems in Karuizawa -- Papers

Color Demosaicing Using Asymmetric Directional Interpolation and Hue Vector Smoothing

Yoshihisa TAKAHASHI1, Kentaro HIRAKI2, Hisakazu KIKUCHI1 and Shogo MURAMATSU1

1 The authors are with the Department of Electrical and Electronic Engineering, Niigata University, Niigata-shi, 950-2181 Japan. E-mail: yoshi-ta{at}telecom0.eng.niigata-u.ac.jp, 2 The author is with Oki Data Corporation, Takasaki-shi, 370-8585 Japan.


  Abstract

This paper presents a color demosaicing method applied to the Bayer pattern color filter array (CFA). Reliable estimation of an edge direction, edge-directed asymmetric interpolation, and the use of color samples at immediate neighbors are considered as the key guidelines for smooth and sharp image restoration. Also, special interest is directed to local areas that are rich in high spatial frequency variations. For suppression of false colors likely to occur in those areas, a hue vector representation is introduced so that the spatial correlation between different color components may be exploited in consistent with the local constant-hue principle. Smoothing is repeated in the hue vector field a few times. Experimental results have shown preferable performances in terms of PSNR, CIELAB color difference, hue angle difference, CIE chromaticity and visual appearance, in particular resulting in less false colors.

Key Words: image processing, color demosaicing, interpolation, CFA

Manuscript received June 26, 2007. Manuscript revised October 6, 2007.


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