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Implementation of the Color Matching Between Mobile Camera and Mobile LCD Based on RGB LUT  

Son Chang-Hwan (School of Electrical Engineering and Computer Science, Kyungpook National Univ.)
Park Kee-Hyon (School of Electrical Engineering and Computer Science, Kyungpook National Univ.)
Lee Cheol-Hee (Major of Computer Engineering, Andong National Univ.)
Ha Yeong-Ho (School of Electrical Engineering and Computer Science, Kyungpook National Univ.)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.43, no.3, 2006 , pp. 25-33 More about this Journal
Abstract
This paper proposed device-independent color matching algorithm based on the 3D RGB lookup table (LUT) between mobile camera and mobile LCD (Liquid Crystal Display) to improve the color-fidelity. Proposed algorithm is composed of thee steps, which is device characterization, gamut mapping, 3D RGB-LUT design. First, the characterization of mobile LCD is executed using the sigmoidal function, different from conventional method such as GOG (Gain Offset Gamma) and S-curve modeling, based on the observation of electro-optical transfer function of mobile LCD. Next, mobile camera characterization is conducted by fitting the digital value of GretagColor chart captured under the daylight environment (D65) and tristimulus values (CIELAB) using the polynomial regression. However, the CIELAB values estimated by polynomial regression exceed the maximum boundary of the CIELAB color space. Therefore, these values are corrected by linear compression of the lightness and chroma. Finally, gamut mapping is used to overcome the gamut difference between mobile camera and moible LCD. To implement the real-time processing, 3D RGB-LUT is designed based on the 3D RGB-LUT and its performance is evaluated and compared with conventional method.
Keywords
Mobile characterization; Gamut mapping; Color matching; Independent color space;
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