【電機系書報討論演講訊息】 

書報討論網址：http://www.ee.nthu.edu.tw/~ee591000/

題   目：Regularized Background Adaptation：A Novel Learning Rate Control Scheme for Gaussian Mixture Modeling

講   員：莊仁輝 教授 (交通大學資訊工程學系)

時間與地點：2011年9月30日(星期五)下午2時10分，資電館B01演講廳

Abstract

    To model a scene for background subtraction, Gaussian mixture modeling (GMM) is a popular choice for its capability of adaptation to background variations.  However, GMM often suffers from a   tradeoff between robustness to background changes and sensitivity to foreground abnormalities and is inefficient in managing the tradeoff for various surveillance scenarios.  By reviewing the formulations of   GMM, we identify that such a tradeoff can be easily controlled by adaptive adjustments of the GMM’s learning rates for image pixels at different locations and of distinct properties.  A new rate control scheme based on high-level feedback is then developed to provide better regularization of background adaptation for GMM and to help resolving the tradeoff. Additionally, to handle lighting variations that change too fast to be caught by GMM, a heuristic rooting in frame difference is proposed to assist the proposed rate   control scheme for reducing false foreground alarms.  Experiments show the proposed learning rate control scheme, together with the heuristic for adaptation of over-quick lighting change, gives better performance than conventional GMM approaches.

Biography

    Jen-Hui Chuang was born on March 27 1958 in Taipei, Taiwan, Republic of China. He received the B.S. degree in Electrical Engineering from National Taiwan University in 1980, the M.S. degree in Electrical and Computer Engineering from the University of California at Santa Barbara in 1983, and the Ph.D. degree in Electrical and Computer Engineering from the University of Illinois at Urbana-Champaign in 1991.

    Between 1980 and 1982 he was a Maintenance Officer for HAWK missile system with the Chinese Army.  Between 1983 and 1985 he was a Design and Development Engineer with the LSI Logic Corporation, Milpitas, California. Between 1985 and 1989 he was a Research Assistant with the Signal Processing Group at the Coordinated Science Laboratory, University of Illinois. Between 1989 and 1991 he was a Research Assistant with the Robot Vision Laboratory at the Beckman Institute for Advanced Science and Technology, University of Illinois. Since August 1991, he has been on the faculty of the Department of Computer and Information Science at National Chiao Tung University.

    His research interests include robotics, computer vision, 3-D modeling, speech and image processing, and VLSI systems. Dr. Chuang is a member of IEEE and the Tau Beta Pi Society.

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