NDLI: Effective use of spatial and spectral correlations for color filter array demosaicking

Content Provider	IEEE Xplore Digital Library
Author	Lanlan Chang Yap-Peng Tan
Copyright Year	1975
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.
Sponsorship	IEEE Consumer Electronics Society
Starting Page	355
Ending Page	365
Page Count	11
File Size	1054215
File Format	PDF
ISSN	00983063
Volume Number	50
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sensor arrays CMOS image sensors Charge-coupled image sensors Pixel Costs Digital cameras Charge coupled devices Digital filters Image restoration Color
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Media Technology

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