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General Information
    • ISSN: 2301-3559
    • Frequency: Quarterly
    • DOI: 10.18178/LNSE
    • Editor-in-Chief: Prof. Jemal Antidze
    • Executive Editor: Ms. Nina Lee
    • Abstracting/ Indexing: EI (INSPEC, IET), DOAJ, Electronic Journals Library, Engineering & Technology Digital Library, Ulrich's Periodicals Directory, International Computer Science Digital Library (ICSDL), ProQuest and Google Scholar.
    • E-mail: lnse@ejournal.net
Prof. Jemal Antidze
I. Vekua Scientific Institute of Applied Mathematics
Tbilisi State University, Georgia
I'm happy to take on the position of editor in chief of LNSE. We encourage authors to submit papers concerning any branch of Software Engineering.

LNSE 2013 Vol.1(4): 329-333 ISSN: 2301-3559
DOI: 10.7763/LNSE.2013.V1.71

Illumination Normalization Using Weighted Gradient Integral Images

Yonghuai Liu, Luigi De Dominicis, Ralph R. Martin, and Baogang Wei
Abstract—Captured images arise through interaction between objects of interest and illuminating light sources. If the latter are unevenly distributed, or are too strong or too weak, the image can have low contrast either locally or globally, impeding its interpretation and reducing its usefulness. In practice, control of illumination conditions is challenging, and not always possible. Thus, we propose a novel method to post-process captured images to reduce the effects of the illumination. We employ the Sobel operator to estimate gradients in the image, then use these gradients as weights in an averaging operation. To accelerate the operation, and remove certain unwanted features, integral images are iteratively calculated from the weighted images. This allows us to estimate the illumination component of the images, and in turn the reflectance component as their enhanced ones. A comparative study using a large number of images shows that the proposed algorithm outperforms several state of the art approaches.

Index Terms—Image enhancement, illumination removal, gradient, reflectance, Retinex.

Y. Liu is with Aberystwyth University, Ceredigion SY23 3DB, United Kingdom (e-mail: yyl@ aber.ac.uk).
L. De Dominicis is with ENEA, 000444 Frascati, Italy (e-mail: luigi.dedominicis@enva.it).
R. R. Martin is with Cardiff University, Cardiff CF24 3AA, United Kingdom (e-mail: Ralph.Martin@cs.cardiff.ac.uk).
B. Wei is with Zhejiang University, Hangzhou 310027, P.R. China (e-mail: wbg@zhu.edu.cn).


Cite: Yonghuai Liu, Luigi De Dominicis, Ralph R. Martin, and Baogang Wei, "Illumination Normalization Using Weighted Gradient Integral Images," Lecture Notes on Software Engineering vol. 1, no. 4, pp. 329-333, 2013.

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