28 May 2003 Nonlinear contrast enhancement based on the Retinex approach
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Abstract
In this paper we present a digital image enhancement technique which relies on the application of a nonlinear operator within the Retinex approach. The basic idea of this approach is to separate the illumination and reflectance components of the image, so that by reducing the contribution of the former it is possible to effectively control the dynamic range of the latter. However, its behaviour critically depends on the quality of the illumination estimation process, so that either annoying artifacts are generated, or very complex operators have to be used, which may prevent the use of this method in several cost- and time-sensitive applications. Our method is able to provide, thanks to the use of a suitable nonlinear operator, good quality, artifacts-free images at a limited computational complexity.
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Giovanni Ramponi, Giovanni Ramponi, Livio Tenze, Livio Tenze, Sergio Carrato, Sergio Carrato, Stefano Marsi, Stefano Marsi, } "Nonlinear contrast enhancement based on the Retinex approach", Proc. SPIE 5014, Image Processing: Algorithms and Systems II, (28 May 2003); doi: 10.1117/12.477714; https://doi.org/10.1117/12.477714
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