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2018

Bell, Matthew J. and Tzimiropoulos, Georgios (2018) Novel monitoring systems to obtain dairy cattle phenotypes associated with sustainable production. Frontiers in Sustainable Food Systems, 2 . 31/1-31/9. ISSN 2571-581X

Bulat, Adrian and Tzimiropoulos, Georgios (2018) Super-FAN: integrated facial landmark localization and super-resolution of real-world low resolution faces in arbitrary poses with GANs. In: IEEE Conference on Computer Vision and Pattern Recognition (CVPR 2018), 18-22 June 2018, Salt Lake City, Utah, USA.

Stafylakis, Themos and Tzimiropoulos, Georgios (2018) Deep word embeddings for visual speech recognition. In: IEEE International Conference on Acoustics, Speech, and Signal Processing, 15-20 April 2018, Calgary, Alberta, Canada.

Petridis, Stavros, Stafylakis, Themos, Ma, Pingchuan, Cai, Feipeng, Tzimiropoulos, Georgios and Pantic, Maja (2018) End-to-end audiovisual speech recognition. In: IEEE International Conference on Acoustics, Speech, and Signal Processing, 15-20 April 2018, Calgary, Alberta, Canada.

2017

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 (ICCV17), 22-29 Oct 2017, Venice, Italy.

Khan, Muhammad Haris, McDonagh, John and Tzimiropoulos, Georgios (2017) Synergy between face alignment and tracking via Discriminative Global Consensus Optimization. In: International Conference on Computer Vision (ICCV17), 22-29 Oct 2017, Venice, Italy.

Bulat, Adrian and Tzimiropoulos, Georgios (2017) How far are we from solving the 2D & 3D face alignment problem? (and a dataset of 230,000 3D facial landmarks). In: International Conference on Computer Vision (ICCV17), 22-29 Oct 2017, Venice, Italy.

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 (ICCV17), 22-29 Oct 2017, Venice, Italy.

Pound, Michael P., Atkinson, Jonathan A., Townsend, Alexandra J., Wilson, Michael H., Griffiths, Marcus, Jackson, Aaron S., Bulat, Adrian, Tzimiropoulos, Georgios, Wells, Darren M., Murchie, Erik H., Pridmore, Tony P. and French, Andrew P. (2017) Deep machine learning provides state-of-the-art performance in image-based plant phenotyping. GigaScience, 6 (10). pp. 1-10. ISSN 2047-217X

Sánchez-Lozano, Enrique, Tzimiropoulos, Georgios, Martinez, Brais, De la Torre, Fernando and Valstar, Michel (2017) A functional regression approach to facial landmark tracking. IEEE Transactions on Pattern Analysis and Machine Intelligence . ISSN 1939-3539

Stafylakis, Themos and Tzimiropoulos, Georgios (2017) Combining residual networks with LSTMs for lipreading. In: Interspeech 2017, 20-24 August 2017, Stockholm, Sweden.

2016

Kossaifi, Jean, Tzimiropoulos, Georgios and Pantic, Maja (2016) Fast and exact Newton and bidirectional fitting of Active Appearance Models. IEEE Transactions on Image Processing, 26 (2). pp. 1040-1053. ISSN 1941-0042 (In Press)

Escalera, Sergio, Torres, Mercedes Torres, Martinez, Brais, Baro, Xavier, Escalante, Hugo Jair, 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 AnalysisWorkshop and Challenge 2016. In: IEEE Conference on Computer Vision and Pattern Recognition Workshops (CVPRW), 26 June - 1 July 2016, Las Vegas, NV, USA.

Dupre, Rob, Argyriou, Vasileios, Tzimiropoulos, Georgios and Greenhill, Darrel (2016) Risk analysis for smart homes and domestic robots using robust shape and physics descriptors, and complex boosting techniques. Information Sciences, 372 . pp. 359-379. ISSN 1872-6291

Argyriou, Vasileios and Tzimiropoulos, Georgios (2016) Frequency domain subpixel registration using HOG phase correlation. Computer Vision and Image Understanding . ISSN 1077-3142

Sánchez Lozano, Enrique, Martinez, Brais, Tzimiropoulos, Georgios and Valstar, Michel F. (2016) Cascaded continuous regression for real-time incremental face tracking. In: 14th European Conference on Computer Vision (EECV 2016), 8-16 October 2016, Amsterdam, Netherlands.

Jackson, Aaron S., Valstar, Michel and Tzimiropoulos, Georgios (2016) A CNN cascade for landmark guided semantic part segmentation. In: ECCV 2016 Workshop, Geometry meets Deep Learning, 9 October 2016, Amsterdam, Netherlands.

Bulat, Adrian and Tzimiropoulos, Georgios (2016) Human pose estimation via convolutional part heatmap regression. In: 14th European Conference on Computer Vision (EECV 2016), 8-16 October 2016, Amsterdam, Netherlands.

Tzimiropoulos, Georgios and Pantic, Maja (2016) Fast algorithms for fitting active appearance models to unconstrained images. International Journal of Computer Vision . ISSN 1573-1405

Bulat, Adrian and Tzimiropoulos, Georgios (2016) Convolutional aggregation of local evidence for large pose face alignment. In: BMCV 2016, 19-22 September 2016, York, U.K..

Snape, Patrick, Pszczolkowski, Stefan, Zafeiriou, Stefanos, Tzimiropoulos, Georgios, Ledig, Christian and Rueckert, Daniel (2016) A robust similarity measure for volumetric image registration with outliers. Image and Vision Computing, 52 . pp. 97-113. ISSN 1872-8138

Sagonas, Christos, Antonakos, Epameinondas, Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2016) 300 faces in-the-wild challenge: database and results. Image and Vision Computing . ISSN 0262-8856

2015

Shen, Jie, Zafeiriou, Stefanos, Chrysos, Grigorios G., Kossaifi, Jean, Tzimiropoulos, Georgios and Pantic, Maja (2015) The first Facial Landmark Tracking in-the-Wild Challenge: benchmark and results. In: 2015 IEEE International Conference on Computer Vision, 7-13 Dec 2015, Chile.

Kossaifi, Jean, Tzimiropoulos, Georgios and Pantic, Maja (2015) Fast and exact bi-directional fitting of active appearance models. In: IEEE International Conference on Image Processing (ICIP 2015), 27-30 September 2015, Quebec City, Canada.

Antonakos, Epameinondas, Alabort-i-Medina, Joan, Tzimiropoulos, Georgios and Zafeiriou, Stefanos P. (2015) Feature-based Lucas-Kanade and Active Appearance Models. IEEE Transactions on Image Processing, 24 (9). pp. 2617-2632. ISSN 1941-0042

Tzimiropoulos, Georgios (2015) Project-out cascaded regression with an application to face alignment. In: 2015 IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 7-12 June 2015, Boston, USA.

2014

Tzimiropoulos, Georgios, Medina, Joan Alabort, Zafeiriou, Stefanos and Pantic, Maja (2014) Active orientation models for face alignment in-the-wild. IEEE Transactions on Information Forensics and Security, 9 (12). pp. 2024-2034. ISSN 1556-6013

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). pp. 707-727. ISSN 0262-8856

Asthana, Akshay, Zafeiriou, Stefanos, Tzimiropoulos, Georgios, Cheng, Shiyang and Pantic, Maja (2014) From pixels to response maps: discriminative image filtering for face alignment in the wild. IEEE Transactions on Pattern Analysis and Machine Intelligence, 37 (6). pp. 1312-1320. ISSN 0162-8828

Antonakos, Epameinondas, Alabort-i-Medina, Joan, Tzimiropoulos, Georgios and Zafeiriou, Stefanos (2014) HOG active appearance models. In: 2014 IEEE International Conference on Image Processing (ICIP), 27-30 Oct 2014, Paris, France.

Tzimiropoulos, Georgios and Pantic, Maja (2014) Gauss-Newton Deformable Part Models for face alignment in-the-wild. In: 2014 IEEE Conference on Computer Vision and Pattern Recognition, 23-28 June 2014, Columbus, USA.

Antonakos, Epameinondas, Alabort-i-Medina, Joan, Tzimiropoulos, Georgios and Zafeiriou, Stefanos (2014) Hog active appearance models. In: IEEE International Conference on Image Processing, 2014 (ICIP 2014), 27-30 October 2014, Paris, France.

2013

Sagonas, Christos, Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2013) 300 Faces in-the-Wild Challenge: the first facial landmark localization challenge. In: 2013 IEEE International Conference on Computer Vision (ICCV), 2-8 Dec 2013, Sydney, Australia.

Sagonas, Christos, Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2013) A semi-automatic methodology for facial landmark annotation. In: 2013 IEEE Conference on Computer Vision and Pattern Recognition (CVPRW), 23-28 June 2013, Portland, Oregon, USA.

Liwicki, Stephan, Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2013) Euler principal component analysis. International Journal of Computer Vision, 101 (3). pp. 498-518. ISSN 1573-1405

Tzimiropoulos, Georgios, Alabort-i-Medina, Joan, Zafeiriou, Stefanos and Pantic, Maja (2013) Generic active appearance models revisited. Lecture Notes in Computer Science, 7726 . pp. 650-663. ISSN 0302-9743

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: 2013 10th IEEE International Conference on Automatic Face & Gesture Recognition and Workshops (FG 2013), 22-26 April 2013, Shanghai, China.

Tzimiropoulos, Georgios and Pantic, Maja (2013) Optimization problems for fast AAM fitting in-the-wild. In: 2013 IEEE International Conference on Computer Vision (ICCV), 2-8 Dec 2013, Sydney, Australia.

2012

Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2012) Subspace learning from image gradient orientations. IEEE Transactions on Pattern Analysis and Machine Intelligence, 34 (12). pp. 2454-2466. ISSN 1939-3539

Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2012) Subspace learning from image gradient orientations. IEEE Transactions on Pattern Analysis and Machine Intelligence, 34 (12). pp. 2454-2466. ISSN 1939-3539

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). pp. 1624-1636. ISSN 2162-237X

Zafeiriou, Stefanos, Tzimiropoulos, Georgios, Petrou, Maria and Stathaki, Tania (2012) Regularized kernel discriminant analysis with a robust kernel for face recognition and verification. IEEE Transactions on Neural Networks and Learning Systems, 23 (3). pp. 526-534. ISSN 2162-237X

Marras, Ioannis, Zafeiriou, Stefanos and Tzimiropoulos, Georgios (2012) Robust learning from normals for 3D face recognition. Lecture Notes in Computer Science, 7584 . pp. 230-239. ISSN 0302-9743

2011

Liwicki, Stephan, Zafeiriou, Stefanos, Tzimiropoulos, Georgios and Pantic, Maja (2011) Fast and robust appearance-based tracking. In: 2011 IEEE International Conference on Automatic Face & Gesture Recognition (FG 2011), 21-25 March 2011, Santa Barbara, California, USA.

Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2011) Principal component analysis of image gradient orientations for face recognition. In: 2011 IEEE International Conference on Automatic Face & Gesture Recognition (FG 2011), 21-25 March 2011, Santa Barbara, California, USA.

Eyben, F., Petridis, S., Schuller, Björn, Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2011) Audiovisual classification of vocal outbursts in human conversation using long-short-term memory networks. In: ICASSP 2011 - 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 22-27 May 2011, Prague, Czech Republic.

Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2011) Robust and efficient parametric face alignment. In: 2011 IEEE International Conference on Computer Vision (ICCV), 6-13 November 2011, Barcelona, Spain.

Tzimiropoulos, Georgios, Zafeiriou, Stefanos and Pantic, Maja (2011) Sparse representations of image gradient orientations for visual recognition and tracking. In: 2011 IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops (CVPRW), 20-25 June 2011, Colorado Springs, USA.

Zafeiriou, Stefanos, Tzimiropoulos, Georgios and Pantic, Maja (2011) Subspace analysis of arbitrarily many linear filter responses with an application to face tracking. In: 2011 IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops (CBPRW), 20-25 June 2011, Colorado Springs, USA.

2010

Stafylakis, Themos, Tzimiropoulos, Georgios, Katsouros, Vassilis and Carayannis, George (2010) A new penalty term for the BIC with respect to speaker diarization. In: ICASSP 2010 - 2010 IEEE International Conference on Acoustics Speech and Signal Processing, 14-19 March 2010, Dallas, USA.

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: IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 13-18 June 2010, San Francisco, USA.

Mitianoudis, Nikolaos, Tzimiropoulos, Georgios and Stathaki, Tania (2010) Fast wavelet-based pansharpening of multi-spectral images. In: 2010 IEEE International Conference on Imaging Systems and Techniques (IST), 1-2 July 2010, Thessaloniki, Greece.

2009

Tzimiropoulos, Georgios, Argyriou, Vasileios and Stathaki, Tania (2009) FFT-based estimation of large motions in images: a robust gradient-based approach. In: 2009 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP 2009), 19-24 April 2009, Taipei, Taiwan.

Tzimiropoulos, Georgios, Mitianoudis, Nikolaos and Stathaki, Tania (2009) A unifying approach to moment-based shape orientation and symmetry classification. IEEE Transactions on Image Processing, 18 (1). pp. 125-139. ISSN 1057-7149

2008

Tzimiropoulos, Georgios, Argyriou, Vasileios and Stathaki, Tania (2008) A frequency domain approach to roto-translation estimation using gradient cross-correlation. In: British Machine Vision Conference (BMVC 2008), 1-4 September 2008, Leeds, UK.

Tzimiropoulos, Georgios, Argyriou, Vasileios and Stathaki, Tania (2008) Symmetry detection using frequency domain motion estimation techniques. In: IEEE International Conference on Acoustics, Speech and Signal Processing, 2008. ICASSP 2008, 31 March - 4 April 2008, Las Vegas, NV, USA.

2007

Tzimiropoulos, Georgios, Mitianoudis, Nikolaos and Stathaki, Tania (2007) An affine invariant function using PCA bases with an application to within-class object recognition. In: ICASSP 2007 - 2007 IEEE International Conference on Acoustics, Speech and Signal Processing, 15-20 April 2007, Honolulu, USA.

Tzimiropoulos, Georgios, Mitianoudis, Nikolaos and Stathaki, Tania (2007) Robust recognition of planar shapes under affine transforms using principal component analysis. IEEE Signal Processing Letters, 14 (10). pp. 723-726. ISSN 1070-9908