Abstract
Fading effect of old pictures and printings is shown up differently according to the ink property, temperature, humidity, illuminants, and so on. Faded image enhancement techniques based on illuminant estimation are proposed such as the gray world algorithm and white patch retinex methods. However, conventional simple operators are not suitable for enhancing faded images because partial fading effect is appeared differently. Thus, this paper presents a color enhancement algorithm based on integrating correction coefficients for faded images. First, the proposed method adopts local process by using multi-scale average mask. The coefficients for each multi-scale average mask are obtained to apply the gray world algorithm. Then, integrating the coefficients with weights is performed to calculate correction ratio for red and blue channels in the gray world assumption. Finally, the enhanced image is obtained by applying the integrated coefficients to the gray world algorithm. In the experimental results, the proposed method reproduces better colors for both wholly and partially faded images compared with the previous methods. 논문 14-39A-08-04 The Journal of Korea Information and Communications Society '14-08 Vol.39A No.08 http://dx.doi.org/10.7840/kics.2014.39A.8.459 459 ※ 이 논문은 2013년도 정부(교육과학기술부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임.(No. NRF-2013R1A2A2A01016105) First Author : Kyungpook National University, School of Electronics Engineering, kyungwj@ee.knu.ac.kr, 학생회원 ° Corresponding Author : Kyungpook National University, School of Electronics Engineering, yha@ee.knu.ac.kr, 종신회원 * Kyungpook National University, School of Electronics Engineering, straycats@ee.knu.ac.kr, 학생회원 논문번호:KICS2014-05-152, Received May 1, 2014; Revised August 8, 2014; Accepted August 8, 2014 The Journal of Korea Information and Communications Society '14-08 Vol.39A No.08
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