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http://dx.doi.org/10.5762/KAIS.2018.19.5.9

Retinex-based Logarithm Transformation Method for Color Image Enhancement  

Kim, Donghyung (Dept. of Computer Science & Information Systems, Hanyang Women's Univ.)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.5, 2018 , pp. 9-16 More about this Journal
Abstract
Images with lower illumination from the light source or with dark regions due to shadows, etc., can improve subjective image quality by using retinex-based image enhancement schemes. The retinex theory is a method that recognizes the relative lightness of a scene, rather than recognizing the brightness of the scene. The way the human visual system recognizes a scene in a specific position can be in one of several methods: single-scale retinex, multi-scale retinex, and multi-scale retinex with color restoration (MSRCR). The proposed method is based on the MSRCR method, which includes a color restoration step, which consists of three phases. In the first phase, the existing MSRCR method is applied. In the second phase, the dynamic range of the MSRCR output is adjusted according to its histogram. In the last phase, the proposed method transforms the retinex output value into the display dynamic range using a logarithm transformation function considering human visual system characteristics. Experimental results show that the proposed algorithm effectively increases the subjective image quality, not only in dark images but also in images including both bright and dark areas. Especially in a low lightness image, the proposed algorithm showed higher performance improvement than the conventional approaches.
Keywords
Retinex; Single Scale Retinex(SSR); Multi Scale Retinex(MSR); Multi Scale Retinex Color Restoration(MSRCR); Logarithm Transformation Function;
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