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[演講公告]Incremental Fixed-Rank Robust PCA for Video Background Recovery

最後更新時間: 2017-12-21 15:41:58

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 時間:2018年01月04日(四)13:30~15:00

地點:交通大學工程三館411會議室

演講者:新加坡國立大學 廖偉權教授

主持人:陳永昇教授

 

講題:Incremental Fixed-Rank Robust PCA for Video Background Recovery

 

摘要:Video background recovery is a very important task in computer vision applications. Recent research offers robust principal component analysis (RPCA) as a promising approach for solving video background recovery. RPCA works by decomposing a data matrix into a low-rank matrix and a sparse matrix. Our previous work shows that when the desired rank of the low-rank matrix is known, fixing the rank in the algorithm called FrALM (fixed-rank ALM) yields more robust and accurate results than existing RPCA algorithms. However, application of RPCA to video background recovery requires that each frame in the video is encoded as a column in the data matrix. This is impractical in real applications because the videos can be easily larger than the amount of memory in a computer. This talk presents an algorithm called iFrALM (incremental fixed-rank ALM) that computes fixed-rank RPCA incrementally by splitting the video frames into an initial batch and an incremental batch. Comprehensive tests show that iFrALM uses less memory and time compared to FrALM. Moreover, the initial batch size and batch quality can be carefully selected to ensure that iFrALM reduces memory and time complexity without sacrificing accuracy.

 

講者簡歷:Dr. Leow Wee Kheng obtained his B.Sc. and M.Sc. in Computer Science from National University of Singapore in 1985 and 1989 respectively. He pursued Ph.D. study at The University of Texas at Austin and obtained his Ph.D. in Computer Science in 1994. His curent research interests include medical image analysis, surgery planning and simulation and general computer vision. He has published more than 130 technical papers in journals, conferences, and books. He has also been awarded three U.S. patents and a Singapore patent. He has served in the Program Committees and Organizing Committees of various conferences. He collaborates widely with a large number of hospitals including Singapore General Hospital and National University Hospital. He has also collaborated with National Taiwan University Hospital in the past.