Publications

Journal Publications E. Sanchez-Lozano, G. Tzimiropoulos, B. Martinez, F. De la Torre, M. Valstar, “A Functional Regression approach to facial landmark tracking”, IEEE Transactions on Pattern Analysis & Machine Intelligence, in press [.pdf] G. Tzimiropoulos, M. Pantic, “Fast algorithms for fitting Active Appearance Models to unconstrained images”, International Journal of Computer Vision, in press [.pdf] J. Kossaifi, G. Tzimiropoulos, M. Pantic, “Fast and exact Newton and Bidirectional tting of Active Appearance Models”, IEEE Transactions on Image Processing, Vol. 26 (2), 2017, pp. 1040-1053 [.pdf] R. Dupre, V. Argyriou, G. Tzimiropoulos, D. Greenhill, “Risk analysis for smart homes and domestic robots using robust shape and physics descriptors, and complex boosting techniques”, Information Sciences, Vol. 372, 2016, pp. 359-379 [.pdf] C. Sagonas, E. Antonakos, G. Tzimiropoulos , S. Zafeiriou, M. Pantic, “300 faces in-the-wild challenge: Database and results”, Image and Vision Computing Journal, Vol. 47, 2016, pp. 3-18 [.pdf] P. Snape, S. Pszczolkowski, S. Zafeiriou, G. Tzimiropoulos , C. Ledig, D. Rueckert, “A robust similarity measure for volumetric image registration with outliers”, Image and Vision Computing Journal, Vol. 52, 2016, pp. 97-113 [.pdf] E. Antonakos, J. Alabort-i-Medina, G. Tzimiropoulos, S. Zafeiriou, “ Feature-Based Lucas-Kanade and Active Appearance Models”, IEEE Transactions on Image Processing, Vol. 37 (6), 2015, pp. 2617-2632 [.pdf] A. Asthana, S. Zafeiriou, G. Tzimiropoulos, S. Cheng, M. Pantic, “From Pixels to Response Maps: Discriminative Image Filtering for Face Alignment in the Wild”, IEEE Transactions on Pattern Analysis & Machine Intelligence, Vol. 24 (9), 2015, pp. 1312-1320 [.pdf] 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] 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] 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] 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] 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] 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] G. Tzimiropoulos, V. Argyriou, T. Stathaki, “Subpixel registration with gradient correlation”, IEEE Transactions on Image Processing, Vol. 20 (6), 2011, pp. 1761-1767 [.pdf] 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] 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] 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 A. Bulat, G. Tzimiropoulos, “Super-FAN: Integrated facial landmark localization and super-resolution of real-world low resolution faces in arbitrary poses with GANs”, IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2018 SPOTLIGHT [.pdf] A. Bulat, G. Tzimiropoulos, “ Binarized convolutional landmark localizers for human pose estimation and face alignment with limited resources “, IEEE International Conference on Computer Vision (ICCV), 2017 ORAL [.pdf] A. Bulat, G. Tzimiropoulos, “How far are we from solving the 2D & 3D face alignment prob- lem? (and a dataset of 230,000 3D facial landmarks)”, IEEE International Conference on Computer Vision (ICCV), 2017 [.pdf] A.S. Jackson, A. Bulat, V. Argyriou, G. Tzimiropoulos, “Large pose 3D face reconstruction from a single image via direct volumetric CNN regression”, IEEE International Conference on Computer Vision (ICCV), 2017 [.pdf] M.H. Khan, J. McDonagh, G. Tzimiropoulos, “Synergy between face alignment and tracking using global variable consensus optimization”, IEEE International Conference on Computer Vision (ICCV), 2017 SPOTLIGHT [.pdf] A. Bulat, G. Tzimiropoulos, “Human pose estimation via convolutional part heatmap regression”, IEEE European Conference on Computer Vision (ECCV), 2016 [.pdf] E. Sanchez-Lozano, B. Martinez, G. Tzimiropoulos, M. Valstar, “Cascaded continuous regression for real-time incremental face tracking”, IEEE European Conference on Computer Vision (ECCV), 2016 [.pdf] G. Tzimiropoulos, “Project-Out Cascaded Regression with an application to Face Alignment”, IEEE Conference on Computer Vision & Pattern Recognition (CVPR), 2015 [.pdf] G. Tzimiropoulos, M. Pantic, “Gauss-Newton Deformable Part Models for Face Alignment in-the-Wild”, IEEE Conference on Computer Vision & Pattern Recognition (CVPR), 2014 [.pdf] G. Tzimiropoulos, M. Pantic, “Optimization problems for fast AAM fitting in-the-Wild”, IEEE International Conference on Computer Vision (ICCV), 2013 [.pdf] G. Tzimiropoulos, S. Zafeiriou, M. Pantic, “Robust and efficient parametric face alignment”, IEEE International Conference on Computer Vision (ICCV), 2011, ORAL [.pdf] G. Toderici, G. Passalis, S. Zafeiriou, G. Tzimiropoulos, M. Petrou, T. Theoharis, I. Kakadiaris, “Bidirectional relighting for 3D-aided 2D Face Recognition”, IEEE Conference on Computer Vision & Pattern Recognition (CVPR), 2010 [.pdf] Other Conferences T. Stafylakis, G. Tzimiropoulos, “Combining ResNets with LSTMs for lip-reading”, Interspeech, 2017 [.pdf] A. Bulat, G. Tzimiropoulos, “Two-stage Convolutional Part Heatmap Regression for the 1st 3D Face Alignment in the Wild (3DFAW) Challenge”, European Conference on Computer Vision Workshops (ECCV-W), 2016 Challenge Winners [.pdf] A. Jackson, M. Valstar, G. Tzimiropoulos, “A CNN cascade for landmark guided semantic part segmentation”, European Conference on Computer Vision Workshops (ECCV-W), 2016 [.pdf] A. Bulat, G. Tzimiropoulos, “Convolutional aggregation of local evidence for large pose face alignment”, British Machine Vision Conference (BMVC), 2016 [.pdf] J. Kossaifi, G. Tzimiropoulos, M. Pantic, “Fast and Exact Bi-directional Fitting of Active Appearance Models” , IEEE International Conference on Image Processing (ICIP), 2015 [.pdf] J. Shen, S. Zafeiriou, G. Chrysos, J. Kossaifi, G. Tzimiropoulos , M. Pantic, “The first facial landmark tracking in-the-wild challenge: Benchmark and results”, IEEE International Conference on Computer Vision Workshops (ICCV-W), 2015 [.pdf] R. Dupre, V. Argyriou, D. Greenhill, G. Tzimiropoulos , “A 3D scene analysis framework and descriptors for risk evaluation”, 3D Vision (3DV), 2015, [.pdf] E. Antonakos, J. Alabort-i-Medina, G. Tzimiropoulos, S. Zafeiriou, “HOG Active Appearance Models”, IEEE International Conference on Image Processing (ICIP), 2014 [.pdf] J. Kossaifi, G. Tzimiropoulos, M. Pantic, “Fast Newton Active Appearance Models” , IEEE International Conference on Image Processing (ICIP), 2014 [.pdf] 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] 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] 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] G. Tzimiropoulos, J. Alabort-i-Medina, S. Zafeiriou, M. Pantic, “Generic Active Appearance Models Revisited”, Asian Conference on Computer Vision (ACCV), 2012 [.pdf] I. Marras, S. Zafeiriou, G. Tzimiropoulos “Robust learning from normals for 3d face recognition”, European Conference on Computer Vision Workshops (ECCV-W), 2012 [.pdf] 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] 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] 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] 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] 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] N. Mitianoudis, G. Tzimiropoulos, T. Stathaki, “Fast Wavelet-based Pansharpening of Multi-Spectral Images”, IEEE International Conference on Imaging Systems and Techniques, 2010 [.pdf] 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] 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] G. Tzimiropoulos, V. Argyriou, T. Stathaki, “A frequency approach to roto-translation estimation using gradient correlation”, British Machine Vision Conference (BMVC), 2008 [.pdf] 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] 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]