时　间：2012年12月17日星期一上午10：30
地　点：浙江大学紫金港校区图书信息中心B楼CAD&CG国家重点实验室402室
报告题目：Real-time Contrast Preserving Decolorization
报告人：徐立博士
主持人：章国锋  副教授

Abstract:
Decolorization –the process to transform a color image to a grayscale one –is a basic tool in digital printing,  stylized black-and-white photography, and in many single channel image processing applications. In this talk, we present an optimization approach aiming at maximally preserving the original color contrast. Our main contribution is to alleviate a strict order constraint for color mapping based on human vision system, which enables the employment of a bimodal distribution to constrain spatial pixel difference and allows for automatic selection of suitable gray scale in order to preserve the original contrast.  In order to achieve real-time performance, we further devise a discrete searching optimization which takes advantage of a linear parametric grayscale model as well as a sampling based optimization.  Both the quantitative and qualitative experiments validate the effectiveness of the proposed method.

Bio:
Li XU received the BS and MS degrees in CSE from Shanghai JiaoTong University (SJTU) in 2004 and 2007 respectively, and the PhD degree in 2010 in CSE from the Chinese University of Hong Kong (CUHK), where he is currently a postdoctoral fellow. He received the Microsoft Research Asia Fellowship Award in 2008 and was the co-recipient of the best paper award of NPAR 2012.  He served as committee members and reviewers for several major computer vision/graphics conferences and journals. His major research areas include motion estimation, image deblurring, image/video analysis and enhancement.