Takis Perakis
Panagiotis B. Perakis
Research Associate
Computer Graphics Laboratory
Dept. of Informatics and Telecoms, University of Athens, Greece
e-mail: p.perakis @ di.uoa.gr,  giotiperi @ gmail.com
Research
Interests
Computer Graphics & Visualization, Computer Vision & Image Analysis, Machine Intelligence & Pattern
Recognition, Constraint Satisfaction Problems and Physics-based Modeling & Simulations.
Education
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
Languages Greek, English, German
Professional
Experience
Worked as a post-doctoral researcher at the NTNU-University, Norway (2013-2016).
Co-founder and CTO of a Greek software development company (since 1993).
Worked as a Physics teacher in secondary education's tutoring centers (1987-1997).
Teaching
Experience
Computer Graphics I   OpenGL Laboratory Course - Undergraduate (2008-2013)
  Dept. of Informatics and Telecoms, University of Athens
Graphics and Visualization   OpenGL Laboratory Course - Postgraduate (2012-2013)
  Dept. of Informatics and Telecoms, University of Athens
Data Structures   C/C++ Laboratory Course - Undergraduate (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)
Projects
PRESIOUS   Predictive digitization, restoration and degradation assessment of cultural heritage objects.
Publications Journal Articles
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). doi

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). PatRec 2014 doi

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). TPAMI 2013 doi

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). TPAMI 2011 doi
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. CHNT 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. EG/3DOR 2015 doi

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. EG/GCH 2014 doi

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. BTAS 2009 BTAS 2009 doi

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. EG/3DOR 2009 EG/3DOR 2009 doi
Conference Posters
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. EG/3DOR 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. EG/GCH 2014
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. PRESIOUS-D3.6

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. TP-2010-01

P. Perakis and T. Theoharis, "Statistical Landmark Models: An ASM Approach", Tech. Report TP-2008-03,
Computer Graphics Laboratory, University of Athens, Dec. 2008. TP-2008-03
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. Handbook of Face Recognition doi

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. doi
Theses
P. Perakis, "Landmark Detection for Unconstrained Face Recognition", PhD Thesis,
Dept. of Informatics and Telecoms, University of Athens, 2013. (English ver. PhD Thesis (English)) (Greek ver. PhD Thesis (Greek))

P. Perakis, "Face and facial interest points detection on 2D images", MSc Thesis,
Dept. of Informatics and Telecoms, University of Athens, 2008. (in Greek MSc Thesis)
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 Facial Landmark Annotation Files)

Reviews 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).
Expert Systems With Applications, 2014 (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).
Associations Hellenic Physical Society
American Physical Society - Division of Computational Physics
IEEE Computer Society
 Personal Links
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PRESIOUS
NTNU
26 Noe 2016