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Yorgos Tzimiropoulos

Assistant Professor in Computer Science, Faculty of Science

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Biography

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 January 2015, I am Assistant Professor in the School of Computer Science at the University of Nottingham and member of the Computer Vision Laboratory

From 2011 to 2014, I was Senior Lecturer in the School of Computer Science at the University of Lincoln and a part-time Senior Research Fellow in the Intelligent Behaviour Understanding Group (iBUG), Department of Computing at Imperial College. Prior to this, I was a Research Associate in the same group.

I am currently an Associate Editor of the Image and Vision Computing Journal.

Expertise Summary

Computer Vision, Machine Learning

Teaching Summary

G51DBS Database Systems

Research Summary

My main research interests are in the areas of visual learning and alignment with a focus on face and object detection, recognition, alignment and tracking, and facial expression analysis.

Recent Publications

  • TZIMIROPOULOS, GEORGIOS and PANTIC, MAJA, 2017. Fast Algorithms for Fitting Active Appearance Models to Unconstrained Images INTERNATIONAL JOURNAL OF COMPUTER VISION. 122(1), 17-33
  • KOSSAIFI, JEAN, TZIMIROPOULOS, GEORGIOS and PANTIC, MAJA, 2017. Fast and Exact Newton and Bidirectional Fitting of Active Appearance Models IEEE TRANSACTIONS ON IMAGE PROCESSING. 26(2), 1040-1053
  • ARGYRIOU, VASILEIOS and TZIMIROPOULOS, GEORGIOS, 2017. Frequency domain subpixel registration using HOG phase correlation COMPUTER VISION AND IMAGE UNDERSTANDING. 155, 70-82
  • SANCHEZ-LOZANO E, TZIMIROPOULOS G, MARTINEZ B, TORRE F and VALSTAR M, 2017. A Functional Regression approach to Facial Landmark Tracking. IEEE transactions on pattern analysis and machine intelligence. (In Press.)
  • BULAT, ADRIAN and TZIMIROPOULOS, GEORGIOS, 2017. Binarized Convolutional Landmark Localizers for Human Pose Estimation and Face Alignment with Limited Resources In: International Conference on Computer Vision.
  • JACKSON, AARON S., BULAT, ADRIAN, ARGYRIOU, VASILEIOS and TZIMIROPOULOS, GEORGIOS, 2017. Large Pose 3D Face Reconstruction from a Single Image via Direct Volumetric CNN Regression In: International Conference on Computer Vision.
  • MICHAEL POUND, ALEXANDRA J BURGESS, MICHAEL H WILSON, JONATHAN A ATKINSON, MARCUS GRIFFITHS, AARON S JACKSON, ADRIAN BULAT, GEORGIOS TZIMIROPOULOS, DARREN M WELLS, ERIK H MURCHIE, TONY P PRIDMORE and ANDREW P FRENCH, 2016. Deep Machine Learning provides state-of-the-art performance in image-based plant phenotyping Biorxiv. Available at: <http://biorxiv.org/content/early/2016/05/12/053033>
  • ENRIQUE SANCHEZ LOZANO, BRAIS MARTINEZ, YORGOS TZIMIROPOULOS and MICHEL VALSTAR, 2016. Cascaded Continuous Regression for Real-time Incremental Face Tracking In: Proc. European Conference on Computer Vision (ECCV2016).
  • BULAT, ADRIAN and TZIMIROPOULOS, GEORGIOS, 2016. Human pose estimation via convolutional part heatmap regression In: European Conference on Computer Vision. 717-732
  • BULAT, ADRIAN and TZIMIROPOULOS, GEORGIOS, 2016. Convolutional aggregation of local evidence for large pose face alignment In: British Machine Vision Conference.
  • JACKSON, AS, VALSTAR, M and TZIMIROPOULOS, G, 2016. A CNN Cascade for Landmark Guided Semantic Part Segmentation In: Proceedings of ECCV 2016 Workshops, Geometry Meets Deep Learning (GMDL).
  • POUND, MICHAEL P, BURGESS, ALEXANDRA J, WILSON, MICHAEL H, ATKINSON, JONATHAN A, GRIFFITHS, MARCUS, JACKSON, AARON S, BULAT, ADRIAN, TZIMIROPOULOS, GEORGIOS, WELLS, DARREN M, MURCHIE, ERIK H and OTHERS, 2016. Deep Machine Learning provides state-of-the-art performance in image-based plant phenotyping bioRxiv. 053033
  • BULAT, ADRIAN and TZIMIROPOULOS, GEORGIOS, 2016. Two-stage convolutional part heatmap regression for the 1st 3d face alignment in the wild (3DFAW) challenge In: European Conference on Computer Vision. 616-624
  • ESCALERA, SERGIO, TONES, MERCEDES TORRES, MARTINEZ, BRAIS, BARO, XAVIER, JAIR ESCALANTE, HUGO, GUYON, ISABELLE, TZIMIROPOULOS, GEORGIOS, CORNEANU, CIPRIAN, OLIU, MARC, BAGHERI, MOHAMMAD ALI and VALSTAR, MICHEL, 2016. ChaLearn Looking at People and Faces of the World: Face Analysis Workshop and Challenge 2016 PROCEEDINGS OF 29TH IEEE CONFERENCE ON COMPUTER VISION AND PATTERN RECOGNITION WORKSHOPS, (CVPRW 2016). 706-713
  • BULAT, ADRIAN and TZIMIROPOULOS, GEORGIOS, 2016. Two-Stage Convolutional Part Heatmap Regression for the 1st 3D Face Alignment in the Wild (3DFAW) Challenge COMPUTER VISION - ECCV 2016 WORKSHOPS, PT II. 9914, 616-624
  • SANCHEZ-LOZANO, ENRIQUE, MARTINEZ, BRAIS, TZIMIROPOULOS, GEORGIOS and VALSTAR, MICHEL, 2016. Cascaded Continuous Regression for Real-Time Incremental Face Tracking COMPUTER VISION - ECCV 2016, PT VIII. 9912, 645-661
  • JACKSON, AARON S., VALSTAR, MICHEL and TZIMIROPOULOS, GEORGIOS, 2016. A CNN Cascade for Landmark Guided Semantic Part Segmentation Computer Vision - ECCV 2016 Workshops, Pt III. 9915, 143-155
  • MCDONAGH, JOHN and TZIMIROPOULOS, GEORGIOS, 2016. Joint Face Detection and Alignment with a Deformable Hough Transform Model COMPUTER VISION - ECCV 2016 WORKSHOPS, PT II. 9914, 569-580
  • KOSSAIFI, JEAN, TZIMIROPOULOS, YORGOS and PANTIC, MAJA, 2016. Fast and exact Newton and Bidirectional fitting of Active Appearance Models. IEEE transactions on image processing : a publication of the IEEE Signal Processing Society.
  • ASTHANA, AKSHAY, ZAFEIRIOU, STEFANOS, TZIMIROPOULOS, GEORGIOS, CHENG, SHIYANG and PANTIC, MAJA, 2015. From Pixels to Response Maps: Discriminative Image Filtering for Face Alignment in the Wild IEEE Transactions on Pattern Analysis & Machine Intelligence. 37(6), 1312-1320
  • E. ANTONAKOS, J. ALABORT-I-MEDINA, G. TZIMIROPOULOS and S. ZAFEIRIOU, 2015. Feature-Based Lucas-Kanade and Active Appearance Models IEEE Transactions on Image Processing. 9(9), 2617--2632
  • G. TZIMIROPOULOS, 2015. Project-Out Cascaded Regression with an application to Face Alignment In: The IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2015. 3659-3667 (In Press.)
  • J. KOSSAIFI, G. TZIMIROPOULOS and M. PANTIC, 2015. Fast and Exact Bi-directional Fitting of Active Appearance Models In: IEEE International Conference on Image Processing (ICIP), 2015. (In Press.)
  • TZIMIROPOULOS, GEORGIOS and PANTIC, MAJA, 2014. Gauss-Newton Deformable Part Models for Face Alignment in-the-Wild In: Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition. 1851-1858
  • MARRAS, IOANNIS, TZIMIROPOULOS, GEORGIOS, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2014. Online learning and fusion of orientation appearance models for robust rigid object tracking Image and Vision Computing. 32(10), 707-727
  • TZIMIROPOULOS, GEORGIOS, MEDINA, J, ZAFEIRIOU, S and PANTIC, MAJA, 2014. Active Orientation Models for Face Alignment In-the-Wild Information Forensics and Security, IEEE Transactions on. 9(12), 224-234
  • KOSSAIFI, JEAN, TZIMIROPOULOS, GEORGIOS and PANTIC, MAJA, 2014. Fast Newton Active Appearance Models In: Image Processing, 2014. ICIP 2014. IEEE International Conference on.
  • ANTONAKOS, EPAMEINONDAS, ALABORT-I-MEDINA, JOAN, TZIMIROPOULOS, GEORGIOS and ZAFEIRIOU, STEFANOS, 2014. Hog active appearance models In: Image Processing (ICIP), 2014 IEEE International Conference on. 224-228
  • SAGONAS, CHRISTOS, TZIMIROPOULOS, GEORGIOS, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2013. A semi-automatic methodology for facial landmark annotation In: Computer Vision and Pattern Recognition Workshops (CVPRW), 2013 IEEE Conference on. 896-903
  • SAGONAS, CHRISTOS, TZIMIROPOULOS, GEORGIOS, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2013. 300 Faces in-the-Wild Challenge: The first facial landmark localization Challenge In: International Conference on Computer Vision, (ICCV-W), 300 Faces in-the-Wild Challenge (300-W), Sydney, Australia, 2013.
  • TZIMIROPOULOS, GEORGIOS, ALABORT-I-MEDINA, JOAN, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2013. Generic active appearance models revisited Computer Vision-ACCV 2012. 650-663
  • LIWICKI, STEPHAN, TZIMIROPOULOS, GEORGIOS, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2013. Euler principal component analysis International journal of computer vision. 101(3), 498-518
  • TZIMIROPOULOS, GEORGIOS and PANTIC, MAJA, 2013. Optimization problems for fast AAM fitting in-the-wild In: Computer Vision (ICCV), 2013 IEEE International Conference on.
  • MARRAS, IOANNIS, MEDINA, JOAN ALABORT, TZIMIROPOULOS, GEORGIOS, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2013. Online Learning and Fusion of Orientation Appearance Models for Robust Rigid Object Tracking In: Automatic Face & Gesture Recognition and Workshops (FG 2013), 2013 IEEE International Conference on. 1-8
  • TZIMIROPOULOS, GEORGIOS, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2012. Subspace learning from image gradient orientations Pattern Analysis and Machine Intelligence, IEEE Transactions on. 34(12), 2454-2466
  • ZAFEIRIOU, STEFANOS, TZIMIROPOULOS, GEORGIOS, PETROU, MARIA and STATHAKI, TANIA, 2012. Regularized kernel discriminant analysis with a robust kernel for face recognition and verification Neural Networks and Learning Systems, IEEE Transactions on. 23(3), 526-534
  • LIWICKI, STEPHAN, ZAFEIRIOU, STEFANOS, TZIMIROPOULOS, GEORGIOS and PANTIC, MAJA, 2012. Efficient online subspace learning with an indefinite kernel for visual tracking and recognition Neural Networks and Learning Systems, IEEE Transactions on. 23(10), 1624-1636
  • MARRAS, IOANNIS, ZAFEIRIOU, STEFANOS and TZIMIROPOULOS, GEORGIOS, 2012. Robust learning from normals for 3d face recognition In: Computer Vision-ECCV 2012. Workshops and Demonstrations. 230-239
  • TZIMIROPOULOS, GEORGIOS, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2011. Robust and Efficient Parametric Face Alignment In: Computer Vision (ICCV), 2011 IEEE International Conference on. 1847-1854
  • TZIMIROPOULOS, GEORGIOS, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2011. Principal component analysis of image gradient orientations for face recognition In: Automatic Face & Gesture Recognition and Workshops (FG 2011), 2011 IEEE International Conference on. 553-558
  • EYBEN, F., PETRIDIS, S., B., SCHULLER, TZIMIROPOULOS, G., ZAFEIRIOU, S. and PANTIC, M., 2011. Audiovisual classification of vocal outbursts in human conversation using long-short-term memory networks In: Acoustics, Speech and Signal Processing (ICASSP), 2011 IEEE International Conference on. 5844-5847
  • TZIMIROPOULOS, GEORGIOS, ZAFEIRIOU, STEFANOS and PANTIC, MAJA, 2011. Sparse Representations of Image Gradient Orientations for Visual Recognition and Tracking In: Computer Vision and Pattern Recognition Workshops.
  • TZIMIROPOULOS, GEORGIOS, ARGYRIOU, VASILEIOS and STATHAKI, TANIA, 2011. Subpixel registration with gradient correlation Image Processing, IEEE Transactions on. 20(6), 1761-1767
  • LIWICKI, STEPHAN, ZAFEIRIOU, STEFANOS, TZIMIROPOULOS, GEORGIOS and PANTIC, MAJA, 2011. Fast and robust appearance-based tracking In: Automatic Face & Gesture Recognition and Workshops (FG 2011), 2011 IEEE International Conference on. 507-513
  • ZAFEIRIOU, STEFANOS, TZIMIROPOULOS, GEORGIOS and PANTIC, MAJA, 2011. Subspace analysis of arbitrarily many linear filter responses with an application to face tracking In: Computer Vision and Pattern Recognition Workshops (CVPRW), 2011 IEEE Computer Society Conference on. 37-42
  • TZIMIROPOULOS, GEORGIOS, ARGYRIOU, VASILEIOS, ZAFEIRIOU, STEFANOS and STATHAKI, TANIA, 2010. Robust FFT-based scale-invariant image registration with image gradients Pattern Analysis and Machine Intelligence, IEEE Transactions on. 32(10), 1899-1906
  • TODERICI, GEORGE, PASSALIS, GEORGIOS, ZAFEIRIOU, STEFANOS, TZIMIROPOULOS, GEORGIOS, PETROU, MARIA, THEOHARIS, THEOHARIS and KAKADIARIS, IOANNIS A, 2010. Bidirectional relighting for 3D-aided 2D face recognition In: Computer Vision and Pattern Recognition (CVPR), 2010 IEEE Conference on. 2721-2728
  • STAFYLAKIS, THEMOS, TZIMIROPOULOS, GEORGIOS, KATSOUROS, VASSILIOS and CARAYANNIS, GEORGE, 2010. A new penalty term for the BIC with respect to speaker diarization In: Acoustics Speech and Signal Processing (ICASSP), 2010 IEEE International Conference on. 4978-4981
  • MITIANOUDIS, NIKOLAOS, TZIMIROPOULOS, GEORGIOS and STATHAKI, TANIA, 2010. Fast wavelet-based pansharpening of multi-spectral images In: Imaging Systems and Techniques (IST), 2010 IEEE International Conference on. 11-16
  • TZIMIROPOULOS, GEORGIOS and ZAFEIRIOU, STEFANOS, 2010. On the Subspace of Image Gradient Orientations arXiv preprint arXiv:1005.2715.
  • TZIMIROPOULOS, GEORGIOS and STATHAKI, TANIA, 2010. Estimation of Subpixel Shifts Using Gradient Correlation 5th SEAS DTC Technical Conference. Edinburg.
  • TZIMIROPOULOS, GEORGIOS and STATHAKI, TANIA, 2009. Robust FFT-based scale-invariant image registration 4th SEAS DTC Technical Conference, Edinburgh. 7-8
  • TZIMIROPOULOS, GEORGIOS, ARGYRIOU, VASILEIOS and STATHAKI, TANIA, 2009. FFT-based estimation of large motions in images: A robust gradient-based approach In: Acoustics, Speech and Signal Processing, 2009. ICASSP 2009. IEEE International Conference on. 969-972
  • TZIMIROPOULOS, GEORGIOS, 2009. A fast gradient-based approach to image template matching
  • TZIMIROPOULOS, GEORGIOS, ARGYRIOU, VASILEIOS and STATHAKI, TANIA, 2008. A Frequency Domain Approach to Roto-translation Estimation using Gradient Cross-Correlation. In: BMVC. 1-10
  • TZIMIROPOULOS, GEORGIOS, MITIANOUDIS, NIKOLAOS and STATHAKI, TANIA, 2007. Robust recognition of planar shapes under affine transforms using principal component analysis Signal Processing Letters, IEEE. 14(10), 723-726
  • TZIMIROPOULOS, GEORGIOS, MITIANOUDIS, NIKOLAOS and STATHAKI, TANIA, 2007. An affine invariant function using PCA bases with an application to within-class object recognition In: Acoustics, Speech and Signal Processing, 2007. ICASSP 2007. IEEE International Conference on. I-785

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