DocumentCode :
935974
Title :
Effective use of spatial and spectral correlations for color filter array demosaicking
Author :
Chang, Lanlan ; Tan, Yap-Peng
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Volume :
50
Issue :
1
fYear :
2004
fDate :
2/1/2004 12:00:00 AM
Firstpage :
355
Lastpage :
365
Abstract :
To minimize cost and size, most commercial digital cameras acquire imagery using a single electronic sensor (CCD or CMOS) overlaid with a color filter array (CFA) such that each sensor pixel only samples one of the three primary color values. To restore a full-color image from CFA samples, the two missing color values at each pixel need to be estimated from the neighboring samples, a process that is commonly known as CFA demosaicking or interpolation. In this paper we present two contributions to CFA demosaicking. First, we stress the importance of well exploiting both image spatial and spectral correlations, and characterize the demosaicking artifacts due to inadequate use of either correlation. Second, based on the insights gained from our empirical study, we propose effective schemes to enhance two existing state-of-the-art demosaicking methods. Experimental results show that our enhanced methods achieve notable improvements over the existing methods, in terms of both subjective and objective evaluations, on a large variety of test images. In addition, the computational complexities of the enhanced methods are comparable to the originals.
Keywords :
array signal processing; computational complexity; correlation methods; image colour analysis; image sensors; interpolation; optical filters; adaptive-weighted interpolation scheme; alternating-projections method; color filter array demosaicking; color filter array interpolation; computational complexity; digital cameras; effective color interpolation method; full-color image; image spatial correlations; image spectral correlations; single electronic sensor; CMOS image sensors; Charge coupled devices; Charge-coupled image sensors; Color; Costs; Digital cameras; Digital filters; Image restoration; Pixel; Sensor arrays;
fLanguage :
English
Journal_Title :
Consumer Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0098-3063
Type :
jour
DOI :
10.1109/TCE.2004.1277885
Filename :
1277885
Link To Document :
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