Symeon Nikitidis

Dr. Symeon Nikitidis

Position:

Past Member

Email:

Biography

I received the B.Sc. and Ph.D. degrees in informatics from the Aristotle University of Thessaloniki, Thessaloniki, Greece and the M.Sc. degree in advanced computing from the University of Glasgow, Glasgow, U.K. From 2006 to 2012, I was a Research and Teaching Assistant with the Department of Informatics, Aristotle University of Thessaloniki, and since 2012, I have been a Research Associate at the intelligent Behaviour Understanding Group (iBUG), Department of Computing, Imperial College London, U.K. My research interests include statistical machine learning, digital signal and image processing and pattern recognition applied to computer vision problems such as human behaviour analysis.

Projects:

4D-FAB, MAHNOB

Publications

Journal articles

Probabilistic Slow Features for Behavior Analysis

L. Zafeiriou, M. A. Nicolaou, S. Zafeiriou, S. Nikitidis, M. Pantic. IEEE Transactions on Neural Networks and Learning Systems. 2016.

Bibtex reference [hide]
@article{psfaba,
    journal = {IEEE Transactions on Neural Networks and Learning Systems},
    title = {Probabilistic Slow Features for Behavior Analysis},
    year = {2016},
}
Endnote reference [hide]
%0 Journal Article
%T Probabilistic Slow Features for Behavior Analysis
%J IEEE Transactions on Neural Networks and Learning Systems
%D 2016
%F psfaba

Projected Gradients for Subclass Discriminant Nonnegative Subspace Learning

S. Nikitidis, A. Tefas, I. Pitas. IEEE Transactions on Cybernetics. 44(12): pp. 2806 - 2819, December 2014.

Bibtex reference [hide]
@article{PGSDNMF2014,
    pages = {2806--2819},
    journal = {IEEE Transactions on Cybernetics},
    month = {December},
    number = {12},
    title = {Projected Gradients for Subclass Discriminant Nonnegative Subspace Learning},
    volume = {44},
    year = {2014},
}
Endnote reference [hide]
%0 Journal Article
%T Projected Gradients for Subclass Discriminant Nonnegative Subspace Learning
%J IEEE Transactions on Cybernetics
%D 2014
%8 December
%V 44
%N 12
%F PGSDNMF2014
%P 2806-2819

Maximum Margin Projection Subspace Learning for Visual Data Analysis

S. Nikitidis, A. Tefas, I. Pitas. IEEE Transactions on Image Processing. 23(10): pp. 4413 - 4425, October 2014.

Bibtex reference [hide]
@article{MMP_TIP,
    author = {S. Nikitidis and A. Tefas and I. Pitas},
    pages = {4413--4425},
    journal = {IEEE Transactions on Image Processing},
    month = {October},
    number = {10},
    title = {Maximum Margin Projection Subspace Learning for Visual Data Analysis},
    volume = {23},
    year = {2014},
}
Endnote reference [hide]
%0 Journal Article
%T Maximum Margin Projection Subspace Learning for Visual Data Analysis
%A Nikitidis, S.
%A Tefas, A.
%A Pitas, I.
%J IEEE Transactions on Image Processing
%D 2014
%8 October
%V 23
%N 10
%F MMP_TIP
%P 4413-4425

Multiplicative Update Rules for Incremental Training of Multiclass Support Vector Machines

S. Nikitidis, N. Nikolaidis, I. Pitas. Pattern Recognition. 45(5): pp. 1838 - 1852, May 2012.

Bibtex reference [hide]
@article{IncSvms2012,
    pages = {1838--1852},
    journal = {Pattern Recognition},
    month = {May},
    number = {5},
    title = {Multiplicative Update Rules for Incremental Training of Multiclass Support Vector Machines},
    volume = {45},
    year = {2012},
}
Endnote reference [hide]
%0 Journal Article
%T Multiplicative Update Rules for Incremental Training of Multiclass Support Vector Machines
%J Pattern Recognition
%D 2012
%8 May
%V 45
%N 5
%F IncSvms2012
%P 1838-1852

Subclass Discriminant Nonnegative Matrix Factorization for Facial Image Analysis

S. Nikitidis, A. Tefas, N. Nikolaidis, I. Pitas. Pattern Recognition. 45(12): pp. 4080 - 4091, December 2012.

Bibtex reference [hide]
@article{SDNMF2012,
    author = {S. Nikitidis and A. Tefas and I. Pitas},
    pages = {4080--4091},
    journal = {Pattern Recognition},
    month = {December},
    number = {12},
    title = {Subclass Discriminant Nonnegative Matrix Factorization for Facial Image Analysis},
    volume = {45},
    year = {2012},
}
Endnote reference [hide]
%0 Journal Article
%T Subclass Discriminant Nonnegative Matrix Factorization for Facial Image Analysis
%A Nikitidis, S.
%A Tefas, A.
%A Pitas, I.
%J Pattern Recognition
%D 2012
%8 December
%V 45
%N 12
%F SDNMF2012
%P 4080-4091

Camera Motion Estimation Using a Novel Online Vector Field Model in Particle Filters

S. Nikitidis, S. Zafeiriou, I. Pitas. IEEE Transactions on Circuits and Systems for Video Technology. 18(8): pp. 1028 - 1039, August 2008.

Bibtex reference [hide]
@article{Nikitidis2008,
    pages = {1028--1039},
    journal = {IEEE Transactions on Circuits and Systems for Video Technology},
    month = {August},
    number = {8},
    title = {Camera Motion Estimation Using a Novel Online Vector Field Model in Particle Filters},
    volume = {18},
    year = {2008},
}
Endnote reference [hide]
%0 Journal Article
%T Camera Motion Estimation Using a Novel Online Vector Field Model in Particle Filters
%J IEEE Transactions on Circuits and Systems for Video Technology
%D 2008
%8 August
%V 18
%N 8
%F Nikitidis2008
%P 1028-1039

Conference articles

Slow Features Nonnegative Matrix Factorization for Temporal Data Decomposition

L. Zafeiriou, S. Nikitidis, S. Zafeiriou, M. Pantic. Proceedings of the IEEE Int’l Conf. on Image Processing (ICIP’14). Paris, France, pp. 1430 - 1434, October 2014.

Bibtex reference [hide]
@inproceedings{SFNMF_icip2014,
    author = {L. Zafeiriou and S. Nikitidis and S. Zafeiriou and M. Pantic},
    pages = {1430--1434},
    address = {Paris, France},
    booktitle = {Proceedings of the IEEE Int’l Conf. on Image Processing (ICIP’14)},
    month = {October},
    title = {Slow Features Nonnegative Matrix Factorization for Temporal Data Decomposition},
    year = {2014},
}
Endnote reference [hide]
%0 Conference Proceedings
%T Slow Features Nonnegative Matrix Factorization for Temporal Data Decomposition
%A Zafeiriou, L.
%A Nikitidis, S.
%A Zafeiriou, S.
%A Pantic, M.
%B Proceedings of the IEEE Int’l Conf. on Image Processing (ICIP’14)
%D 2014
%8 October
%C Paris, France
%F SFNMF_icip2014
%P 1430-1434

Merging SVMs with Linear Discriminant Analysis: A Combined Model

S. Nikitidis, S. Zafeiriou, M. Pantic. Proceedings of IEEE Int’l Conf. on Computer Vision & Pattern Recognition (CVPR 2014). Columbus, OH, USA, pp. 1067 - 1074, June 2014.

Bibtex reference [hide]
@inproceedings{svms_lda,
    author = {S. Nikitidis and S. Zafeiriou and M. Pantic},
    pages = {1067--1074},
    address = { Columbus, OH, USA},
    booktitle = {Proceedings of IEEE Int’l Conf. on Computer Vision & Pattern Recognition (CVPR 2014)},
    month = {June},
    title = {Merging SVMs with Linear Discriminant Analysis: A Combined Model},
    year = {2014},
}
Endnote reference [hide]
%0 Conference Proceedings
%T Merging SVMs with Linear Discriminant Analysis: A Combined Model
%A Nikitidis, S.
%A Zafeiriou, S.
%A Pantic, M.
%B Proceedings of IEEE Int’l Conf. on Computer Vision & Pattern Recognition (CVPR 2014)
%D 2014
%8 June
%C Columbus, OH, USA
%F svms_lda
%P 1067-1074

Maximum Margin Discriminant Projections for Facial Expression Recognition

S. Nikitidis, A. Tefas, I. Pitas. Proceedings of the 21st European Signal Processing Conference (EUSIPCO 2013). Marrakech, Morocco, pp. 1 - 5, September 2013.

Bibtex reference [hide]
@inproceedings{MMDP_Conf,
    author = {S. Nikitidis and A. Tefas and I. Pitas},
    pages = {1--5},
    address = {Marrakech, Morocco},
    booktitle = {Proceedings of the 21st European Signal Processing Conference (EUSIPCO 2013)},
    month = {September},
    title = {Maximum Margin Discriminant Projections for Facial Expression Recognition},
    year = {2013},
}
Endnote reference [hide]
%0 Conference Proceedings
%T Maximum Margin Discriminant Projections for Facial Expression Recognition
%A Nikitidis, S.
%A Tefas, A.
%A Pitas, I.
%B Proceedings of the 21st European Signal Processing Conference (EUSIPCO 2013)
%D 2013
%8 September
%C Marrakech, Morocco
%F MMDP_Conf
%P 1-5

Learning Slow Features for Behaviour Analysis

L. Zafeiriou, M. A. Nicolaou, S. Zafeiriou, S. Nikitidis, M. Pantic. Proceedings of IEEE Int’l Conf. on Computer Vision (ICCV 2013). Sydney, Australia , November 2013.

Bibtex reference [hide]
@inproceedings{SFA_iccv2013,
    author = {L. Zafeiriou and M. A. Nicolaou and S. Zafeiriou and S. Nikitidis and M. Pantic},
    address = {Sydney, Australia },
    booktitle = {Proceedings of IEEE Int’l Conf. on Computer Vision (ICCV 2013)},
    month = {November },
    title = {Learning Slow Features for Behaviour Analysis },
    year = {2013},
}
Endnote reference [hide]
%0 Conference Proceedings
%T Learning Slow Features for Behaviour Analysis
%A Zafeiriou, L.
%A Nicolaou, M. A.
%A Zafeiriou, S.
%A Nikitidis, S.
%A Pantic, M.
%B Proceedings of IEEE Int’l Conf. on Computer Vision (ICCV 2013)
%D 2013
%8 November
%C Sydney, Australia
%F SFA_iccv2013

Recent Advances in Discriminant Non-negative Matrix Factorization

S. Nikitidis, A. Tefas, I. Pitas. Proceedings of the First Asian Conference on Pattern Recognition (ACPR 2011). Beijing, China, pp. 1 - 6, November 2011.

Bibtex reference [hide]
@inproceedings{ACPR2011,
    author = {S. Nikitidis and A. Tefas and I. Pitas},
    pages = {1--6},
    address = {Beijing, China},
    booktitle = {Proceedings of the First Asian Conference on Pattern Recognition (ACPR 2011)},
    month = {November },
    title = {Recent Advances in Discriminant Non-negative Matrix Factorization},
    year = {2011},
}
Endnote reference [hide]
%0 Conference Proceedings
%T Recent Advances in Discriminant Non-negative Matrix Factorization
%A Nikitidis, S.
%A Tefas, A.
%A Pitas, I.
%B Proceedings of the First Asian Conference on Pattern Recognition (ACPR 2011)
%D 2011
%8 November
%C Beijing, China
%F ACPR2011
%P 1-6

Facial Expression Recognition Using Clustering Discriminant Non-negative Matrix Factorization

S. Nikitidis, A. Tefas, N. Nikolaidis, I. Pitas. Proceedings of the IEEE Int’l Conf. on Image Processing (ICIP’11). Brussels, Belgium, pp. 3001 - 3004, September 2011.

Bibtex reference [hide]
@inproceedings{SDNMF_ICIP,
    pages = {3001--3004},
    address = {Brussels, Belgium},
    booktitle = {Proceedings of the IEEE Int’l Conf. on Image Processing (ICIP’11)},
    month = {September},
    title = {Facial Expression Recognition Using Clustering Discriminant Non-negative Matrix Factorization},
    year = {2011},
}
Endnote reference [hide]
%0 Conference Proceedings
%T Facial Expression Recognition Using Clustering Discriminant Non-negative Matrix Factorization
%B Proceedings of the IEEE Int’l Conf. on Image Processing (ICIP’11)
%D 2011
%8 September
%C Brussels, Belgium
%F SDNMF_ICIP
%P 3001-3004

Using Subclasses in Discriminant Non-negative Subspace Learning for Facial Expression Recognition

S. Nikitidis, A. Tefas, I. Pitas. Proceedings of the 19th European Signal Processing Conference (EUSIPCO 2011). Barcelona, Spain, pp. 1964 - 1968, August 2011.

Bibtex reference [hide]
@inproceedings{SDNMF_Conf,
    author = {S. Nikitidis and A. Tefas and I. Pitas},
    pages = {1964--1968},
    address = {Barcelona, Spain},
    booktitle = {Proceedings of the 19th European Signal Processing Conference (EUSIPCO 2011)},
    month = {August},
    title = {Using Subclasses in Discriminant Non-negative Subspace Learning for Facial Expression Recognition},
    year = {2011},
}
Endnote reference [hide]
%0 Conference Proceedings
%T Using Subclasses in Discriminant Non-negative Subspace Learning for Facial Expression Recognition
%A Nikitidis, S.
%A Tefas, A.
%A Pitas, I.
%B Proceedings of the 19th European Signal Processing Conference (EUSIPCO 2011)
%D 2011
%8 August
%C Barcelona, Spain
%F SDNMF_Conf
%P 1964-1968

Incremental Training of Multiclass Support Vector Machines

S. Nikitidis, N. Nikolaidis, I. Pitas. Proceedings of Int'l Conf. on Pattern Recognition (ICPR'10). Istanbul, Turkey, pp. 4267 - 4270, August 2010.

Bibtex reference [hide]
@inproceedings{NikitidisICPR2010,
    pages = {4267--4270},
    address = {Istanbul, Turkey},
    booktitle = {Proceedings of Int'l Conf. on Pattern Recognition (ICPR'10)},
    month = {August },
    title = {Incremental Training of Multiclass Support Vector Machines},
    year = {2010},
}
Endnote reference [hide]
%0 Conference Proceedings
%T Incremental Training of Multiclass Support Vector Machines
%B Proceedings of Int?l Conf. on Pattern Recognition (ICPR?10)
%D 2010
%8 August
%C Istanbul, Turkey
%F NikitidisICPR2010
%P 4267-4270

Camera Motion Estimation Using Particle Filters

S. Nikitidis, S. Zafeiriou, I. Pitas. Proceedings of Int'l Conf. on Computer Vision Theory and Applications (VISAPP 2008). Funchal Madeira, Portugal, pp. 670 - 673, January 2008.

Bibtex reference [hide]
@inproceedings{NikVisapp2008,
    author = {S. Nikitidis and S. Zafeiriou and I. Pitas},
    pages = {670--673},
    address = {Funchal Madeira, Portugal},
    booktitle = {Proceedings of Int'l Conf. on Computer Vision Theory and Applications (VISAPP 2008)},
    month = {January},
    title = {Camera Motion Estimation Using Particle Filters},
    year = {2008},
}
Endnote reference [hide]
%0 Conference Proceedings
%T Camera Motion Estimation Using Particle Filters
%A Nikitidis, S.
%A Zafeiriou, S.
%A Pitas, I.
%B Proceedings of Int?l Conf. on Computer Vision Theory and Applications (VISAPP 2008)
%D 2008
%8 January
%C Funchal Madeira, Portugal
%F NikVisapp2008
%P 670-673

Other publications

A Joint Discriminative Generative Model for Deformable Model Construction and Classification

I. Marras, S. Nikitidis, S. Zafeiriou, M. Pantic. IEEE Face and Gesture Recognition 2017. May .

Bibtex reference [hide]
@conference{Marras2017,
    booktitle = {IEEE Face and Gesture Recognition 2017},
    month = {May},
    title = {A Joint Discriminative Generative Model for Deformable Model Construction and Classification},
}
Endnote reference [hide]