[IPOL announce] new article: Multiscale Retinex

[announcements about the IPOL journal]

A new article is available in IPOL: http://www.ipol.im/pub/art/2014/107/

Ana Belén Petro, Catalina Sbert, and Jean-Michel Morel, Multiscale 
Retinex, Image Processing On Line,  (2014), pp. 71--88. 
http://dx.doi.org/10.5201/ipol.2014.107

Abstract
While the retinex theory aimed at explaining human color perception, its 
derivations have led to efficient algorithms enhancing local image 
contrast, thus permitting among other features, to "see in the shadows". 
Among these derived algorithms, Multiscale Retinex is probably the most 
successful center-surround image filter. In this paper, we offer an 
analysis and implementation of Multiscale Retinex. We point out and 
resolve some ambiguities of the method. In particular, we show that the 
important color correction final step of the method can be seriously 
improved. This analysis permits to come up with an automatic 
implementation of Multiscale Retinex which is as faithful as possible to 
the one described in the original paper. Overall, this implementation 
delivers excellent results and confirms the validity of Multiscale 
Retinex for image color restoration and contrast enhancement. 
Nevertheless, while the method parameters can be fixed, we show that a 
crucial choice must be left to the user, depending on the lightning 
condition of the image: the method must either be applied to each color 
independently if a color balance is required, or to the luminance only 
if the goal is to achieve local contrast enhancement. Thus, we propose 
two slightly different algorithms to deal with both cases.



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