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Color Correction Method of CIS Digital Camera for Mobile Phone  

Kim Eun-Su (Division Electronic Engineering Sunmoon)
Jang Soo-Wook (Dept. of Electronics Engineering Kyungpook National University)
Lee Sung-Hak (Dept. of Electronics Engineering Kyungpook National University)
Han Chan-Ho (HIT)
Jung Tae-Young (Dept. of Electronics Engineering Kyungpook National University)
Sohng Kyu-Ik (Dept. of Electronics Engineering Kyungpook National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.43, no.4, 2006 , pp. 9-18 More about this Journal
Abstract
In the digital camera system, CMOS image sensor (CIS) is widely used because its size and weight become smaller and power consumption becomes lower. However, there are common problems that colors of the recorded image do not match those of the photographed object and that spectral sensitivity of the CIS used in different cameras varies largely in each case. Therefore, color correction is needed because the spectral sensitivity of the CIS in each color is neither the same color component for most standard colors nor the appropriate color representation for any output devices. In the conventional method, a color correction is empirically obtained by a large number of iterative experiments, but the result is not so satisfied. In this paper, a new method to obtain the efficient color correction matrix for digital camera using CIS is proposed. We obtain camera transfer matrix under the certain white-balance point, and color correction matrix that makes the transfer characteristic of digital camera close to the transfer characteristic of ideal camera is obtained. The experimental results show that the transfer characteristic of digital camera by the proposed method is close to that of the ideal camera. In addition, the image quality of pictures of digital camera using the proposed method is dramatically improved.
Keywords
CMOS 이미지 센서;컬러 보정;화질 향상;카메라 신호처리;
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