DocumentCode :
1225609
Title :
Effective color interpolation in CCD color filter arrays using signal correlation
Author :
Pei, Soo-Chang ; Tam, Io-Kuong
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taiwan
Volume :
13
Issue :
6
fYear :
2003
fDate :
6/1/2003 12:00:00 AM
Firstpage :
503
Lastpage :
513
Abstract :
We propose an effective color filter array (CFA) interpolation method for digital still cameras (DSCs) using a simple image model that correlates the R,G,B channels. In this model, we define the constants KR as green minus red and KB as green minus blue. For real-world images, the contrasts of KR and KB are quite flat over a small region and this property is suitable for interpolation. The main contribution of this paper is that we propose a low-complexity interpolation method to improve the image quality. We show that the frequency response of the proposed method is better than the conventional methods. Simulation results also verify that the proposed method obtain superior image quality on typical images. The luminance channel of the proposed method outperforms by 6.34-dB peak SNR the bilinear method, and the chrominance channels have a 7.69-dB peak signal-to-noise ratio improvement on average. Furthermore, the complexity of the proposed method is comparable to conventional bilinear interpolation. It requires only add and shift operations to implement.
Keywords :
CCD image sensors; cameras; correlation methods; filters; image colour analysis; interpolation; CCD color filter arrays; SNR; add operations; bilinear interpolation; bilinear method; chrominance channels; color interpolation; correlation; digital still cameras; frequency response; image quality; low-complexity interpolation method; luminance channel; peak signal-to-noise ratio; real-world images; shift operations; signal correlation; simulation results; Charge coupled devices; Circuit testing; Color; Contacts; Digital cameras; Digital filters; Frequency response; Image quality; Interpolation; Optical filters;
fLanguage :
English
Journal_Title :
Circuits and Systems for Video Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8215
Type :
jour
DOI :
10.1109/TCSVT.2003.813422
Filename :
1207407
Link To Document :
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