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Enhanced Integrated Multi-scale Retinex based on CIELAB Color Space for Improving Color Reproduction  

Kyung, Wang-Jun (School of Electronics Engineering, Kyungpook National University)
Lee, Tae-Hyoung (School of Electronics Engineering, Kyungpook National University)
Lee, Cheol-Hee (Computer Engineering, Andong National University)
Ha, Yeong-Ho (School of Electronics Engineering, Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.48, no.1, 2011 , pp. 1-7 More about this Journal
Abstract
In this paper, we propose the digital image enhancement method including local tone reproduction and preservation of the hue. In recent studies, an integrated multi-scale retinex (IMSR) has produced great naturalness in the resulting images through enhancement of visibility in dark area in input images. However, most methods, including IMSR, work in RGB color spaces. As such, this produces hue distortion from the perspective of the human visual system, that is, hue distortion in CIELAB color space. Accordingly, this paper proposes an tone reproduction and enhancement of saturation method in a device-independent color space, CIELAB, to preserve the hue and obtain a high contrast and naturalness. First, to achieve the desired objectives, the IMSR is then applied to only the $L^*$ values in CIELAB color space, normalization, and simple mapping function, thereby preserving the balance of the color components and enhancement of visibility. Then, saturation adjustment is performed by applying the ratio of the chroma variation at the sRGB gamut boundary according to the corrected luminance. In experiments, the proposed method is shown to improve the visibility in dark shadows and bright regions in the resulting images and reduce any color distortion then preference test are performed.
Keywords
Tone reproduction; CIELAB color space; Multi-scale Retinex;
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Times Cited By KSCI : 1  (Citation Analysis)
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