Research
Interests
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Computer Graphics & Visualization, Computer Vision & Image Analysis, Machine Intelligence & Pattern
Recognition,
Constraint Satisfaction Problems and Physics-based Modeling & Simulations. |
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Education
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| 2008 - 2013 |
PhD in Informatics
Dept. of Informatics and Telecoms, University of Athens |
| 2006 - 2008 |
MSc in ICT
Dept. of Informatics and Telecoms, University of Athens |
| 1979 - 1986 |
BSc in Physics
Dept. of Physics, University of Athens |
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Languages
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Professional
Experience
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| 2016 - now |
College lecturer in Computer Science |
| 2013 - 2016 |
Post-doctoral researcher at the NTNU-University, Norway |
| 1993 - 2012 |
Co-founder and CTO of a Greek software development company |
| 1987 - 1997 |
Physics teacher in secondary education's tutoring centers |
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Teaching
Experience
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| Computer Graphics I |
Full teaching of undergraduate course (2017-2018)
Dept. of Informatics and Telecoms, University of Athens |
| Computer Graphics I |
OpenGL laboratory undergraduate course (2008-2013)
Dept. of Informatics and Telecoms, University of Athens |
| Graphics and Visualization |
OpenGL laboratory postgraduate course (2012-2013)
Dept. of Informatics and Telecoms, University of Athens |
| Data Structures |
C/C++ laboratory undergraduate course (2008-2010)
Dept. of Informatics and Telecoms, University of Athens |
| Supervising Assistance |
D. Grigoropoulos-Mandalenakis, "Localization of anatomical interest points
on 2D facial images", BSc Thesis, Dept. of Informatics and Telecoms,
University of Athens, 2009. (Supervisor: Prof. T. Theoharis) |
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Projects
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| PRESIOUS |
Predictive digitization, restoration and degradation assessment of cultural heritage objects. |
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Publications
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Journal Articles
I. Pikrammenos, P. Tolis and P. Perakis, "Authentication Mechanism Enhancement Utilising Secure Repository
for Passwordless Handshake", in International Journal of Network Security & Its Applications (IJNSA),
July, 2019 (vol. 11 no. 4).
A. Danelakis, T. Theoharis, I. Pratikakis and P. Perakis, "An effective methodology for dynamic 3D facial
expression retrieval", in Pattern Recognition, Apr. 2016, pp. 174 - 185 (vol. 52).
P. Perakis, T. Theoharis, and I.A. Kakadiaris, "Feature Fusion for Facial Landmark Detection",
in Pattern Recognition, Sep. 2014, pp. 2783 - 2793 (vol. 47 no. 9).
P. Perakis, G. Passalis, T. Theoharis, and I.A. Kakadiaris, "3D Facial Landmark Detection under Large Yaw
and Expression Variations", in IEEE Trans. on Pattern Analysis and Machine Intelligence, July 2013,
pp. 1552 - 1564 (vol. 35 no. 7).
G. Passalis, P. Perakis, T. Theoharis, and I.A. Kakadiaris, "Using Facial Symmetry to Handle Pose Variations
in Real-World 3D Face Recognition", in IEEE Trans. on Pattern Analysis and Machine Intelligence, Oct. 2011,
pp. 1938 - 1951 (vol. 33 no. 10).
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Conference Papers
P. Perakis, C. Schellewald, K. F. Gebremariam and T. Theoharis, "Simulating Erosion on Cultural Heritage
Monuments", in Proc. 20th International Conference on Cultural Heritage and New Technologies (CHNT20),
Vienna, Austria, Nov. 2 – 4, 2015.
R. Gregor, D. Bauer, I. Sipiran, P. Perakis and T. Schreck, "Automatic 3D Object Fracturing for Evaluation of
Partial Retrieval and Object Restoration Tasks - Benchmark and Application to 3D Cultural Heritage Data",
in Proc. Eurographics Workshop on 3D Object Retrieval, Zurich, Switzerland, May 2 - 3 2015.
I. Barros Barbosa, K. F. Gebremariam, P. Perakis, C. Schellewald and T. Theoharis, "Establishing
Parameter Values for the Stone Erosion Process", in Proc. 43rd Annual Conference on Computer
Applications and Quantitative Methods in Archaeology (CAA 2015), Siena, Italy, Mar. 30 – Apr. 3, 2015.
C. Schellewald, P. Perakis, and T. Theoharis, "Towards the Creation of Digital Stones from 2D Samples",
in Proc. 12th Eurographics Workshop on Graphics and Cultural Heritage, Darmstadt, Germany, Oct. 6 - 8
2014, pp. 21 - 24.
P. Perakis, G. Passalis, T. Theoharis, G. Toderici, and I.A. Kakadiaris, "Partial matching of interpose 3D facial
data for face recognition", in Proc. 3rd IEEE International Conference on Biometrics: Theory, Applications and
Systems, Arlington, VA, Sep. 28-30 2009, pp. 439 - 446. Best-Reviewed Paper Award.
P. Perakis, T. Theoharis, G. Passalis, and I.A. Kakadiaris, "Automatic 3D facial region retrieval from multi-pose
facial datasets", in Proc. Eurographics Workshop on 3D Object Retrieval, Munich, Germany, Mar. 30 - Apr. 3
2009, pp. 37 - 44.
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Conference Posters
I. Pikrammenos, C. Lampiris, P. Tolis and P. Perakis, "Emerging multi-functional, personalized secure
environments", in 10th International Conference on Information, Intelligence, Systems and Applications
(IISA 2019), Patras, Greece, July 15 - 17, 2019.
K. F. Gebremariam, P. Perakis, C. Schellewald, T. Theoharis, and L. Kvittingen, "Multi-technique
Characterizations of Marble Stones from Elefsis, Greece, and Soapstones from Grytdal, Norway in Accelerated
Acid Weathering Studies", in 18th European Conference on Analytical Chemistry (Euroanalysis 2015),
Bordeaux, France, Sep. 6 - 10, 2015.
K. F. Gebremariam, I. Barros Barbosa, P. Perakis, C. Schellewald, T. Theoharis, and L. Kvittingen,
"Accelerated Salt Weathering Studies on Marble Stones from Elefsis, Greece, and Soapstones from Grytdal,
Norway", in TECHNART 2015 - Non-destructive and microanalytical techniques in art and cultural heritage,
Catania, Italy, Apr. 27 - 30, 2015.
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Technical Reports
C. Schellewald, P. Perakis, T. Theoharis, K. Sfikas and K. F. Gebremariam, "PRESIOUS-D3.6: Degradation
Prediction Methodology Report", Tech. Report PRESIOUS-D3.6, Dept. of Computer and Information Science,
NTNU, Trondheim, Norway, Sep. 2015.
P. Perakis, G. Passalis, T. Theoharis, and I.A. Kakadiaris, "3D Facial Landmark Detection & Face Registration:
A 3D Facial Landmark Model & 3D Local Shape Descriptors Approach", Tech. Report TP-2010-01,
Computer Graphics Laboratory, University of Athens, Jan. 2010.
P. Perakis and T. Theoharis, "Statistical Landmark Models: An ASM Approach", Tech. Report TP-2008-03,
Computer Graphics Laboratory, University of Athens, Dec. 2008.
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Book Chapters
I.A. Kakadiaris, G. Passalis, G. Toderici, E. Efraty, P. Perakis, D. Chu, S.K. Shah, and T. Theoharis, "Face
recognition using 3D images", in Handbook of Face Recognition, S.Z. Li and A. K. Jain (Eds.), 2nd Ed.
Springer, 2011, pp. 429 - 459.
I.A. Kakadiaris, G. Passalis, G. Toderici, P. Perakis, and T. Theoharis, "Face Recognition, 3D-Based",
in Encyclopedia of Biometrics, S.Z. Li (Ed.), Springer, 2009, pp. 329 - 338.
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Theses
P. Perakis, "Landmark Detection for Unconstrained Face Recognition", PhD Thesis,
Dept. of Informatics and Telecoms, University of Athens, 2013.
(English ver.
)
(Greek ver.
)
P. Perakis, "Face and facial interest points detection on 2D images", MSc Thesis,
Dept. of Informatics and Telecoms, University of Athens, 2008.
(in Greek
)
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Datasets
P. Perakis, "Facial Landmark Annotation Files", the Facial Landmark Annotation Files that were used for training
and also as ground-truth for the evaluation of the performance of our facial landmark detection methods.
(ver. 4 - 2014
 )
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Reviews
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Expert Systems With Applications, 2014 (1), 2018 (1).
IEEE Trans. on Pattern Analysis and Machine Intelligence, 2015 (1), 2016 (1).
Computer Graphics International, 2011 (2), 2012 (1), 2016 (1).
The Visual Computer, 2011 (1), 2016 (1).
Pattern Recognition Letters, 2016 (1).
Pattern Recognition, 2014 (1), 2015 (1).
IET Computer Vision, 2015 (1).
IEEE Transactions on Image Processing, 2013 (1).
IEEE Signal Processing Letters, 2013 (1).
Annals of Biomedical Engineering, 2012 (1).
Image and Vision Computing, 2011 (2), 2012 (1).
Eurographics Workshop on 3D Object Retrieval, 2010 (1).
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Associations
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Hellenic Physical Society
American Physical Society - Division of Computational Physics
IEEE Computer Society
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