讲座名称：Color Filter Array Demosaicing Method for Bayer-like W-RGB Pattern based on Color Difference Assumption
时间：July 5, 2016. 17:00
地点：滨江楼A302
主讲人：Prof. Chong Jong-wha(郑正和), Professor, Hanyang University(Korea)
Abstract：
Demosaicing process which estimates unknown colors of images from CFA to reproduce full color image is an essential process for digital cameras with CFA. In this presentation, a new demosaicing method for Bayer-like W-RGB CFA based on Color Difference Assumption (CDA) is proposed. In order to prevent the blur near the edges, it is important to avoid averaging two pixel values across edge which can cause blur artifact. To that end, edge information should be calculated in advance. By calculating edge strength matrix which contains edge strengths of every pixel, edge direction matrix can be extracted which is used for unknown color estimation step. The proposed method estimates unknown colors based on the principle of CDA. CDA starts estimating by defining the color difference at white location for estimating unknown green color. Defined color difference limits the scope to only one pixel location. The color difference can be extended to 3×3 matrix for including neighboring pixels. By the extended color difference with Laplacian approximation, green color at white location can be estimated. Also, other unknown colors can be estimated by the same principle. Simulation results show that the proposed demosaicing method can demosaic better than the conventional method by approximately 24.6% PSNR and 2.2% feature similarity index (FSIM).
Short Bio：
Jongwha Chongreceived the Ph.D. degree in Electronics & Communication Engineering from Waseda University, Japan, in 1981. Since 1981, he has been a professor, now Chair professor, at the Department of Electronics Engineering, Hanyang University, Seoul. From 1979 to 1980, he was a researcher in C&C Research Center of Nippon Electronic Company. From 1983 to 1984, he was a visiting researcher in the Korean Institute of Electronics & Technology. In 1986 and 2008 respectively, he was a visiting professor at the University of California, Berkeley, USA. He was the chairman of CAD & VLSI society in 1993 at Institute of the Electronic Engineers of Korea. He was the president of IEEK in 2007 and the president of KIEEE from 2009 to 2010, respectively. His current research interests are of SoC design methodology including memory centric design and physical design automation of 3D-IC, indoor wireless communication SoC design for ranging and location, video system and power IT system.
Homepage:http://ecadlab.hanyang.ac.kr/
