김한솔 학생 Sensors 에 논문게재 확정
2020.08.11 09:44
본 연구실의 김한솔 학생과 동서대학교 정보통신공학과 이석호 교수가 연구한 “Demosaicing of RGBW Color Filter Array Based on Rank Minimization with Colorization Constraint” 제목의 논문이 Sensors (Impact factor : 3.275, Rank : Q1) 에 게재가 확정되었다. 본 연구는 연세대학교 전기전자공학과 통합과정 김한솔 학생(1저자), 동서대학교 정보통신공학과 이석호 교수(2저자)와 강문기 교수(교신저자)가 진행하였다.
Abstract
Recently, the white (w) channel has been incorporated in various forms into color filter arrays (CFAs). The advantage of using the W channel is that W pixels have less noise than RGB pixels; therefore, under low-light conditions, pixels with high fidelity can be obtained. However, RGBW CFAs normally suffer from spatial resolution degradation due to a smaller number of color pixels than in RGB CFAs. Therefore, even though the reconstructed colors have higher sensitivity, which results in larger CPSNR values, there are some color aliasing artifacts due to a low resolution. In this paper, we propose a rank minimization-based color interpolation method with a colorization constraint for the RGBW format with a large number of W pixels. The rank minimization can achieve a broad interpolation and preserve the structure in the image, and it thereby eliminates the color artifacts. However, the colors fade from this global process. Therefore, we further incorporate a colorization constraint into the rank minimization process for better reproduction of the colors. Experimental results show that the images can be reconstructed well even from noisy pattern images obtained under low-light conditions.
