| Title | Discriminant Non-negative Matrix Factorization for Facial Image Analysis |
| Speaker | Prof. I. Pitas |
| Chair | Kar-Ann Toh |
Abstract
Non-negative Matrix Factorization (NMF) is among the most popular subspace methods widely used in a variety of image analysis and recognition problems. A discriminant NMF method that incorporates Linear Discriminant Analysis criteria and achieves an efficient decomposition of the provided data to its salient parts has been proposed for facial image analysis recently. An extension of this work specialized for classification, optimized using projected gradients in order to ensure convergence to a stationary limit point, resulted in a more efficient method of the latter approach. Assuming multimodality of the underlying data samples distribution and incorporating clustering discriminant inspired constraints into the NMF decomposition cost function resulted in the Subclass Discriminant NMF algorithm which found to outperform both approaches for facial image analysis under real life settings. In this keynote we review all these methods in the context of facial image analysis (facial expression and face recognition) problems.
Biography
Ioannis Pitas received the Diploma of Electrical Engineering in 1980 and the PhD degree in Electrical Engineering in 1985, both from the University of Thessaloniki, Greece. Since 1994 he has been a Professor at the Department of Informatics, University of Thessaloniki, Greece. From 1980 to 1993 he served as Scientific Assistant, Lecturer, Assistant Professor, and Associate Professor in the Department of Electrical and Computer Engineering at the same University. He leads funded R&D projects in CERTH/ITI. He is an IEEE fellow (2007), IEEE Distinguished Lecturer (2012) and EURASIP fellow (2013). He served as Visiting Professor and ASI fellow at the University of British Columbia, Canada, as Visiting Professor at Yonsei University, Korea, Ecole Polytechnique Federale de Lausanne, Switzerland, at Tampere University of Technology, Finland, as Visiting Assistant Professor at the University of Toronto and as a Visiting Research Associate at the University of Toronto, Canada and at the University of Erlangen-Nuernberg, Germany. He was Chair of the School of Graduate studies in computer science at the University of Thessaloniki. He cooperates with CERTH/ITI in funded R&D projects. His current interests are in the areas of intelligent digital media, digital image/video processing, multimedia signal processing, human centered computing computational intelligence and computer vision. He has published over 700 papers, contributed in 39 books and authored, co-authored, edited, co-edited 8 books in his area of interest. He is the co-author of the books “Nonlinear Digital Filters: Principles and Applications” (Kluwer, 1990), ‘3D image processing algorithms’ (Wiley 2000). He is the author of the books ‘Digital Image Processing Algorithms’ (Prentice Hall, 1993), ‘Digital image processing algorithms and applications’ (Wiley 2000), ‘Digital image processing’ (in Greek, 1999). He is the editor of the book “Parallel Algorithms and Architectures for Digital Image Processing, Computer Vision and Neural Networks” (Wiley, 1993) and co-editor of the book ‘Nonlinear Model-Based Image/Video Processing and Analysis’ (Wiley 2000). He is also the editor of the book “Digital Television and digital video processing” (in Greek 2010). Dr. Pitas has been member of the European Community ESPRIT Parallel Action Committee. He had 10 academic occupation and visits in universities abroad. He co-organized 12 special sessions in conferences, 8 special issues in scientific journals. He is/was editor in 22 journals. He gave 49 invited lectures, was member of the program committee of more than 248 scientific conferences and workshops and was chair of more than 39 conference sessions. He supervised 16 completed PhD theses. He was reviewer in 52 scientific journals, 290 conferences, 33 R&D funding agencies and 4 publishers. He participated in 20 national and international committees and he had a major role in the organization of 14 conferences. He participated in 67 R&D projects, is/was principal investigator/researcher in 40 competitive R&D projects, mostly funded by the European Union. He is/was Associate Editor of the IEEE Transactions on Circuits and Systems, IEEE Transactions on Neural Networks, IEEE Transactions on Image processing, IJIG Journal, IEICE, Circuits Systems and Signal Processing (CSSP), co-editor of Multidimensional Systems and Signal Processing, member of the editorial board of 6 journals and guest editor in 8 special journal issues. He was chair of the 1995 IEEE Workshop on Nonlinear Signal and Image Processing (NSIP95). He was technical chair of the 1998 European Signal Processing Conference. He was the general chair of IEEE ICIP2001. He was co-chair of the 2003 International workshop on Rich media content production. He was technical co-chair of the 2003 Greek Informatics conference (EPY). He was chair of the TC on Digital Signal Processing of the IEEE Circuits and Systems Society. He was vice-chair of the TC on image processing and multidimensional signal processing of the IEEE Signal Processing Society. He was member of the National Research Council of Greece. He has received the 2009 best cited author award by Aristotle University of Thessaloniki (8500+ citations in 2009). The number of citations to his work by third authors is 15700+ (Publish or Perish), 5500+ (Scopus). His H-index is 62+, (source Publish or Perish), 37+ (Scopus), date: October 2012.
