headshot Georgios (Yorgos) Tzimiropoulos
Senior Lecturer (Assistant Professor) in Computer Vision
School of of Computer Science
University of Lincoln
Brayford Pool
Lincoln, LN6 7TS
United Kingdom
E gtzimiropoulos@lincoln.ac.uk; georgios.tzimiropoulos04@imperial.ac.uk
T +44 (0) 1522 837463

Short Bio
I received the diploma degree in Electrical and Computer Engineering from Aristotle University of Thessaloniki, Greece, and the M.Sc. and Ph.D. degrees in Signal Processing and Computer Vision both from Imperial College London, U.K.

As of 2011 I am Senior Lecturer (Assistant Professor) in Computer Vision with the School of Computer Science at the University of Lincoln, U.K. From 2011 to 2014, I was also affiliated with the Department of Computing at Imperial College London as a Researcher at the Intelligent Behaviour Understanding Group (iBug). After the completion of my Ph.D., I worked as a Research and Development engineer with Imperial College/Selex Galileo. Prior to joining the University of Lincoln, I was a Research Associate at the iBug Group at Imperial College working on face analysis. I am currently an Associate Editor of the Image and Vision Computing Journal.

From January 2015, I am joining the Computer Vision Laboratory in the School of Computer Science at the University of Nottingham.

My main research interests are in the areas of face and object recognition, alignment and tracking and facial expression analysis.


Funded PhD opportunity at the University of Nottingham!

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Journal Publications

paper

A. Asthana, S. Zafeiriou, G. Tzimiropoulos, S. Cheng, M. Pantic, "From Pixels to Response Maps: Discriminative Image Filtering for Face Alignment in the Wild", to appear in IEEE Transactions on Pattern Analysis & Machine Intelligence [.pdf]

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G. Tzimiropoulos, J. Alabort-i-Medina, S. Zafeiriou, M. Pantic, "Active Orientation Models for face alignment in-the-Wild", IEEE Transactions on Information Forensics & Security, Special Issue on Facial Biometrics in the Wild, Vol.9 (12), 2014, pp.2024-2034 [.pdf]

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I. Marras, G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "Online Learning and Fusion of Orientation Appearance Models for Robust Rigid Object Tracking", Image and Vision Computing Journal, Special Issue on Best of IEEE Conference on Face and Gesture 2013, 2014 [.pdf]

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S. Liwicki, G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "Euler Principal Component Analysis", International Journal of Computer Vision, Vol.101 (3), 2013, pp.498-518 [.pdf]

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G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "Subspace learning from image gradient orientations", IEEE Transactions on Pattern Analysis & Machine Intelligence, Vol.34 (12), 2012, pp.2454-2466 [.pdf]

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S. Liwicki, S. Zafeiriou, G. Tzimiropoulos, M. Pantic, "Efficient online subspace learning with an indefinite kernel for visual tracking and recognition", IEEE Transactions on Neural Networks & Learning Systems, Vol.23 (10), 2012, pp.1624-1636 [.pdf]

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S. Zafeiriou, G. Tzimiropoulos, M. Petrou, T. Stathaki, "Regularized kernel discriminant analysis with a robust kernel for face recognition and verification", IEEE Transactions on Neural Networks & Learning Systems, Vol.23 (3), 2012, pp.526-534 [.pdf]

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G. Tzimiropoulos, V. Argyriou, T. Stathaki, "Subpixel registration with gradient correlation", IEEE Transactions on Image Processing, Vol.20 (6), 2011, pp.1761-1767 [.pdf]

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G. Tzimiropoulos, V. Argyriou, S. Zafeiriou, T. Stathaki, "Robust FFT-based scale-invariant image registration with image gradients", IEEE Transactions on Pattern Analysis & Machine Intelligence, Vol.10 (32), 2010, pp.1899-1906 [.pdf]

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G. Tzimiropoulos, N. Mitianoudis, T. Stathaki, "A unifying approach to moment-based and shape orientation and symmetry classification", IEEE Transactions on Image Processing, Vol.18 (1), 2009, pp.125-139 [.pdf]

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G. Tzimiropoulos, N. Mitianoudis, T. Stathaki, "Robust recognition of planar shapes under affine transforms using Principal Component Analysis", IEEE Signal Processing Letters, Vol.14 (10), 2007, pp. 723-726 [.pdf]


Top Rank Computer Vision Conferences

paper

G. Tzimiropoulos, M. Pantic, "Gauss-Newton Deformable Part Models for Face Alignment in-the-Wild", IEEE International Conference on Computer Vision & Pattern Recognition (CVPR), 2014 [.pdf]

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G. Tzimiropoulos, M. Pantic, "Optimization problems for fast AAM fitting in-the-Wild", IEEE International Conference on Computer Vision (ICCV), 2013 [.pdf]

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G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "Robust and efficient parametric face alignment", IEEE International Conference on Computer Vision (ICCV), 2011, ORAL [.pdf]

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G. Toderici, G. Passalis, S. Zafeiriou, G. Tzimiropoulos, M. Petrou, T. Theoharis, I. Kakadiaris, "Bidirectional relighting for 3D-aided 2D Face Recognition", IEEE International Conference on Computer Vision & Pattern Recognition (CVPR), 2010 [.pdf]


Other Conferences

paper

E. Antonakos, J. Alabort-i-Medina, G. Tzimiropoulos, S. Zafeiriou, "HOG Active Appearance Models", IEEE International Conference on Image Processing (ICIP), 2014 [.pdf]

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J. Kossaifi, G. Tzimiropoulos, M. Pantic, "Fast Newton Active Appearance Models" , IEEE International Conference on Image Processing (ICIP), 2014 [.pdf]

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C. Sagonas, G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "300 Faces in-the-Wild Challenge: The first facial landmark localization Challenge", IEEE International Conference on Computer Vision Workshops (ICCV-W), 2013 [.pdf]

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C. Sagonas, G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "A semi-automatic methodology for facial landmark annotation", IEEE International Conference on Computer Vision & Pattern Recognition Workshops (CVPR-W), 2013 [.pdf]

paper

I. Marras, J. Alabort-i-Medina G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "Online Learning and Fusion of Orientation Appearance Models for Robust Rigid Object Tracking", IEEE International Conference on Automatic Face and Gesture Recognition (FG), 2013 ORAL [.pdf]

paper

G. Tzimiropoulos, J. Alabort-i-Medina, S. Zafeiriou, M. Pantic, "Generic Active Appearance Models Revisited", Asian Conference on Computer Vision (ACCV), 2012 [.pdf]

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I. Marras, S. Zafeiriou, G. Tzimiropoulos "Robust learning from normals for 3d face recognition", IEEE European Conference on Computer Vision Workshops (ECCV-W), 2012 [.pdf]

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G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "Principal Component Analysis of image gradient orientations for face recognition", IEEE International Conference on Automatic Face and Gesture Recognition (FG), 2011 [.pdf]

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S. Liwicki, S. Zafeiriou, G. Tzimiropoulos, M. Pantic, "Fast and robust appearance-based tracking", IEEE International Conference on Automatic Face and Gesture Recognition (FG), 2011 [.pdf]

paper

F. Eyben, S. Petridis, B. Schuller, G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "Audiovisual classification of vocal outbursts in human conversation using long-short-term memory networks", IEEE International Conference on Acoustics, Speech & Signal Processing (ICASSP), 2011 [.pdf]

paper

S. Zafeiriou, G. Tzimiropoulos, M. Pantic, "Subspace analysis of arbitrarily many linear filter responses with an application to face tracking", IEEE International Conference on Computer Vision & Pattern Recognition (CVPR), workshop on Computer Vision for Computer Games[.pdf]

paper

G. Tzimiropoulos, S. Zafeiriou, M. Pantic, "Sparse representations of image gradient orientations for visual recognition and tracking", IEEE International Conference on Computer Vision & Pattern Recognition (CVPR), workshop on Human Communicative Behavior Analysis [.pdf]

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N. Mitianoudis, G. Tzimiropoulos, T. Stathaki, "Fast Wavelet-based Pansharpening of Multi-Spectral Images", IEEE International Conference on Imaging Systems and Techniques, 2010 [.pdf]

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T. Stafylakis, G. Tzimiropoulos, V. Katsouros, G. Carayannis, "A new penalty term for the BIC with respect to speaker diarization", IEEE International Conference on Acoustics, Speech & Signal Processing (ICASSP), 2010 [.pdf]

paper

G. Tzimiropoulos, V. Argyriou, T. Stathaki, "FFT-based estimation of large motions in images:a robust gradient-based approach", IEEE International Conference on Acoustics, Speech & Signal Processing (ICASSP), 2009 [.pdf]

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G. Tzimiropoulos, V. Argyriou, T. Stathaki, "A frequency approach to roto-translation estimation using gradient correlation", British Machine Vision Conference (BMVC), 2008 [.pdf]

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G. Tzimiropoulos, V. Argyriou, T. Stathaki, "Symmetry detection using frequency domain motion estimation techniques", IEEE International Conference on Acoustics, Speech & Signal Processing (ICASSP), 2008 [.pdf]

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G. Tzimiropoulos, N. Mitianoudis, T. Stathaki, "An affine invariant function using PCA bases with an application to within-class object recognition", IEEE International Conference on Acoustics, Speech & Signal Processing (ICASSP), 2007 [.pdf]