Emmanouil Z. Psarakis Assistant Professor
Dept. of Computer Engineering & Informatics
University of Patras
26500 Rio, Greece

Tel: (+30) 2610996969
Fax: (+30) 2610996971
e-mail: psarakis@ceid.upatras.gr

Dr. E.Z. Psarakis was born in Chanea, Crete, Greece, in 1963. He is married with two children. He received his Ph.D degree form the Department of Computer Engineering and Informatics, University of Patras Greece in 1991. Since 2005 he has been an Assistant Professor at the Department of Computer Engineering and Informatics, University of Patras, and a member of the Signal Processing and Communications Lab.
Dr. Psarakis has published more than 35 papers in refereed international technical journals and proceedings of international conferences. He has served as a reviewer of many international technical journals such as IEEE Transactions on Signal Processing, IEEE Transactions on Circuits and Systems, Elsevier Signal Image and Video Processing, Elsevier Signal Processing, Elsevier Signal Processing Fast Communication and EURASIP Journal on Applied Signal Processing. He has participated, as a principal investigator, for more than ten Hellenic, EU and bilateral R&D projects in the area of signal processing, biomedical signal processing, robot vision and medical image processing.


Signals and Systems Theory : Undergraduate, Second year, Spring semester, Core.
Topics elaborated: Introduction to signals and systems theory, Impulse Functions, Linear systems. Linear Time Invariant Systems, Convolution, Impulse and Frequency Responses. Fourier Transform and Fourier Series, Definition, Properties, Applications. Laplace Transform, Definition, Properties, BIBO Stability of Continuous Time Linear Systems. State Space, States, State Equations, Controllability, Observability, Exponential Stability, Stabilization of Unstable Systems, State Feedback. Z Transform, Definition, Properties, BIBO Stability of Discrete Time Linear Systems.
Digital Signal Processing : Undergraduate, Third year, Spring semester, Core.
Topics elaborated: Sampling and signal reconstruction. Discrete Fourier transform, FFT, Linear and cyclic convolution, Overlap and add, Overlap and save. FIR digital filter design methods: minimum mean squares, don't care. The min-max criterion, Remez exchange algorithm. IIR analog and digital filters: Butterworth, Chebyshev, Design using frequency transformations. Special digital filters: Notch filters, Differentiators, Integrators, Hilbert transformers. Introduction to optimum stochastic signal processing: Wiener filtering with finite and infinite impulse response. Basic spectrum estimation techniques: Spectrogram, Periodogram, AR-model based techniques.
Applications of Digital Signal Processing : Undergraduate, Fourth year, Fall semester, Elective.
Topics elaborated: Single-chip programmable signal processors. Hardware aspects of digital signal processing (DSP) systems, architectural issues, and fixed versus floating pointing representations for implementing DSP algorithms. The emphasis of the course is on the design and implementation of DSP algorithms. The algorithms are implemented on personal, portable DSP based boards. Applications to speech processing, adaptive filtering, telecommunications, image processing and video processing.
Computer Vision and Graphics : Undergraduate, Fifth year, Graduate, Fall semester, Elective.
Topics elaborated: Image formation and optical sensors. Elements of Perspective Geometry. Camera Calibration, orthographic scene projection, linear and nonlinear estimation algorithms of internal and external camera parameters.  Photometry, Shading and Color.  Multidimensional processing systems. Multidimensional Linear Systems and Fourier analysis with emphasis on Gabor filters and wavelets. Analysis of images at multiple scales, image pyramids. Texture Analysis: Fractals, filters Gabor, size distributions. Segmentation of images. Shape Analysis: Curvature, distance transform and skeleton. Basic non-linear systems for analysis of shapes and images. Estimation of optical flow and motion. Stereopsis and geometry of multiple images, scene reconstruction from two images and multiple images. Image Alignment and Registration, Mosaics, Image Metamorphosis. Super-resolution.


Current Ph.D Students
Fotini Fotopoulou: " Efficient Techniques for Searching and Retrieving Images from Large Image Databases." Dept. of Computer Engineering & Informatics, University of Patras, Rio, Greece. Expected completion in 2016.
Petros Vasileiou: " Low Rank Based Calibration Techniques ." Dept. of Computer Engineering & Informatics, University of Patras, Rio, Greece. Expected completion in 2018.
Nefeli Lamprinou: " 3-D Reconstruction Techniques ." Dept. of Computer Engineering & Informatics, University of Patras, Rio, Greece. Expected completion in 2019.
Former Ph.D Students
Georgios Evangelidis: "Parametric Image Alignment Techniques with Applications in Computer Vision." Dept. of Computer Engineering & Informatics, University of Patras, Rio, Greece. Completed in 2008.
Vasileios Pikoulis: " Matching Techniques and their use in Source Relocation Problem." Dept. of Computer Engineering & Informatics, University of Patras, Rio, Greece. Completed in 2015.


Image Processing and Computer Vision: Image Matching Techniques
Image Registration Techniques
Super-Resolution Techniques
Motion Estimation Techniques

Seismological Signal Processing: Clustering Techniques of Similar Seismic events
Relocation Techniques
Automatic Picking of Seismic events

Biomedical Signal Processing: Detection Techniques for Noninvasive Diagnostic Methods

Filter Design Techniques: Design of Multi-Dimensional FIR Filters Using Transformations
Optimum One and Two-Dimensional FIR Filters Using L2 Techniques
FIR and IIR Polynomial Predictive Filters


The relocation problem of seismic event hypocenter parameters. Department of Computer Engineering and Informatics, University of Patras, Greece. Karatheodori research program.

A Robotic System for Handling Textile and non Rigid Flat Materials in Sewing Operation. Department of Computer Engineering and Informatics, University of Patras, Greece. Cooperation program with Dept. of Mechanical Engineering and Aeronautics, University of Patras, Dept. of Electrical Engineering & Computer Technology, University of Patras. Financed by the Greek General Secretariat for Research and Technology.

Sensors for Artificial Vision (AIΣTOP). Computer Technology Institute, Patras, Greece. Cooperation Program with the Institute of Electronic Structure & Laser, Heraclion, Crete, Dept. of Physics, University of Ioannina, Dept. of Electrical Engineering, National Technical University of Athens, Dept. of Physics, University of Crete, Τecnological and Εducational Ιnstitute of Heraklion, Crete. Financed by the Greek General Secretariat for Research and Technology through the Human Networks Programme.

Development of a VLSI system for automatic city navigation. Computer Technology Institute, Patras, Greece. In cooperation with the Pan – Drive company.

Development and study of adaptive estimation algorithms for telecommunication applications. Department of Computer Engineering and Informatics, University of Patras, Greece. Financed by the Greek General Secretariat for Research and Technology.

Automatic finite element model generation of objects using image processing techniques. Computer Technology Institute, Patras, Greece. In cooperation with Agricultural University of Athens, Greece, University of Leuven, Belgium, University of Swansea, Great Britain and University of Ilmenau, Germany. Financed by the European Union through the Human Capital and Mobility Programme.

Detection of visually evoked cortical potentials. Department of Computer Engineering and Informatics, University of Patras, Greece. Cooperation program with University of Ilmenau, Germany. Financed by the Greek and German General Secretariat for Research and Technology.

Development of a PC based visual evoked potentials station for noninvasive medical diagnosis. Department of Computer Engineering and Informatics, University of Patras, Greece. Financed by the Greek General Secretariat for Research and Technology.

Development of a DSP based bio-impedance monitoring station. Computer Technology Institute, Patras, Greece. Cooperation program with University of Ilmenau, Germany. Financed by the Greek and German General Secretariat for Research and Technology.

Fast estimation algorithms for echo cancellation in communication channels. Department of Computer Engineering and Informatics, University of Patras, Greece. Financed by the Greek General Secretariat for Research and Technology.


E-V. M. Pikoulis and E. Z. Psarakis, " A New SDP-Relaxation Based Blind Beamforming Technique," submitted to IEEE Transactions on Signal Processing (Feb. 2017)

N. Nikolikos, E. Z. Psarakis and N. Lamprinou, " A New LS Based Congealing Technique," submitted to Pattern Recognition Letters (Oct. 2016)

F. Fotopoulou and E. Z. Psarakis, " An Efficient Unsupervised Diffusion Clustering Algorithm with Application to Shape Decomposition based on Visibility Context," Signal Processing: Image Communication, Elsevier 2016 (under second review)

J. Liu, E. Z. Psarakis, Yang Feng and I. Stamos, "Automatic Kronecker Product Model Based Detection of Repeated Patterns in 2D Urban Images," Submitted to IEEE Transactions on Pattern Analysis and Machine Intelligence, PAMI (Jan. 2016).

T. Bountis, A.S. Fokas and E. Psarakis, " Fractal Analysis of Tree Paintings by Piet Mondrian (1872-1944)," International Journal of Arts and Technology, to appear 2016

E-V. M. Pikoulis and E. Z. Psarakis, " Automatic Seismic Signal Detection via Record Segmentation," IEEE Transactions on Geoscience and Remote Sensing Vol. 53, No. 7, pp. 3870-3884, Jan. 2015

G. D. Evangelidis and E. Z. Psarakis, "Projective Registration using ECC Maximization," International Journal on Artificial Intelligent Tools, IJAIT, Vol. 18, No.1, pp. 121,139, Jan. 2009.

G. D. Evangelidis and E. Z. Psarakis, "Parametric Image Alignment using Enhanced Correlation Coefficient Maximization," IEEE Transactions on Pattern Analysis and Machine Intelligence, PAMI, Vol. 30, No. 10, pp. 1858-1865, Oct. 2008.

I. Karybali, E. Z. Psarakis, K. Berberidis and G. D. Evangelidis, "An Efficient Spatial Domain Technique for Subpixel Image Registration," Signal Processing: Image Communication, Elsevier, Vol. 23, Issue 9, pp. 711-724, Oct. 2008.

E. Z. Psarakis, "A Weighted L2 Based Method for the Design of One Dimensional Arbitrary FIR Digital Filters," Elsevier Signal Processing Vol. 86, No. 1, pp. 937-950, May 2006.

N. D. Assimakis, E. Z. Psarakis and D. G. Lainiotis, "Steady State Kalman Filter: A new Approach," Journal of Neural, Parallel and Scientific Computations, Vol. 11, No. 4, pp. 485-490, Dec. 2003.

E. Z. Psarakis and G. V. Moustakides, "A Robust Initialization Scheme for the Remez Exchange Algorithm," IEEE Signal Processing Letters, Vol. 10, pp.1-3 Jan. 2003.

G. Moustakides, D. Briassoulis, E.Z. Psarakis, and E. Dimas, "3D Image Acquisation and Nurbs Based Geometric Modelling of Natural Objects," Elsevier Advances in Engineering Software, No 31, pp. 955-969, 2000.

Α. P. Liavas, G. V. Moustakides, G. Henning, E. Z. Psarakis and P. Husar,"A Periodogram Based Method for the Detection of Steady-State Visually Evoked potentials," IEEE Transactions on Biomedical Engineering, Vol. 45, No. 2, pp 242-248, Feb. 1998.

E. Z. Psarakis and G. V. Moustakides, "An L2 Based Method for the Design of One Dimensional Zero Phase FIR Digital Filters," IEEE Transactions on Circuits and Systems I Fundamental Theory and Applications, Vol.44, No. 7, pp. 591-601, July 1997.

G. V. Moustakides and E. Z. Psarakis, "Design of N-Dimensional FIR Filters Using the Symmetric McClellan Transform," IEEE Transactions on Circuits and Systems II-Analog and Digital Signal Processing, Vol 42, Issue 8, pp. 547-550, Aug. 1995.

E. Z. Psarakis and G. V. Moustakides, "Design of Two Dimensional Zero Phase FIR Filters via the Generalized McClellan Transform," IEEE Transactions on Circuits and Systems, Vol. CAS-38, No. 11, pp. 1355-1363, Nov. 1991.

E. Z. Psarakis, V. G. Mertzios and G. Ph. Alexiou, "Design of Two Dimensional Zero Phase FIR Fan Filters via the McClellan Transform," IEEE Transactions on Circuits and Systems, Vol. CAS-37, pp. 10-16, Jan. 1990.


G. D. Evangelidis, D. Kounades-Bastian, R. Horaud and E. Z. Psarakis, "A Generative Model for the Joint Registration of Multiple Point Sets," European International Conference on Computer Vision, ECCV 2014, Zurich, 6-12 Sept. 2014.

P. G. Vasileiou and E. Z. Psarakis, "A New Depth Camera Calibration Algorithm," 23rd IEEE International Conference on Robotics in Alpe-Adria-Danube Region, RAAD 2014, Slovakia, 3-5 Sept. 2014.

J. Liu, E. Z. Psarakis and I. Stamos, "Automatic Kronecker Product Model Based Detection of Repeated Patterns in 2D Urban Images," IEEE International Conference on Computer Vision, ICCV 2013, Sydney, Australia, 3-6 Dec. 2013.

A. E. Lois, E. Z. Psarakis and E-V. M. Pikoulis, "A new thresholding type technique for the detection of seismic events," Eusipco 2013, Marrakesh, Marocco, 09-13 Sept. 2013.

E-V. Pikoulis and E. Z. Psarakis, "A New Iterative Graph Based Clustering Method," IEEE International Conference on Bioinformatics and Bioengineering, BIBE 2012, Larnaca, Cyprus, 11-13 Nov. 2012.

P. G. Vasileiou and E. Z. Psarakis, "A Hybrid 2-D Delaunay Triangulation Algorithm Exploiting the GPU Parallelism," ACM Siggraph Symposium on High Performance Graphics, HPG 2012, Paris, France, 25-27 June 2012.

E-V. Pikoulis and E. Z. Psarakis, "A New Automatic Method For Seismic Signals Segmentation," IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2012, Kyoto, Japan, 25-30 March 2012.

E-V. Pikoulis and E. Z. Psarakis, "A New Hypothesis Testing Based Technique for the Simultaneous Detection of Seismic Events," IEEE International Symposium on Signal Processing and Information Technology, ISSPIT 2011, Bilbao, Spain, 14-17 Dec. 2011.

E-V. Pikoulis and E. Z. Psarakis, "A Ratio Test for The Accurate P-Wave Onset Detection," IEEE International Conference on Signal Processing, ICSP 2010, Beijing, China, 20-24 Oct. 2010.

A. Lois, E. Z. Psarakis, E-V. Pikoulis, E. Sokos and G. A. Gelentis, "A New Chi-Squared based Test Statistic for the Detection of Seismic Events and HOS based Pickers’ Evaluation," 32nd ESC Assembly, Montpellier, France, 5-9 Sept. 2010.

E. Sokos, E-V. Pikoulis, E. Z. Psarakis and A. Lois, "The April 2007 Swarm in Trichonis Lake Using Data From a Microseismic Network," Proceedings of the 12th International Congress of the Geological Society of Greece, Patras, May, 2010.

G. D. Evangelidis , E. Z. Psarakis, "Parametric Image Registration with application to Computer Vision (in greek)," 1st Pan-Hellenic Conference on Robotics (HeRoC), February 2009, Athens.

G. D. Evangelidis and E. Z. Psarakis, "Projective Registration using ECC Maximization," International Conference on Computer Vision Theory and Applications, VISAPP 2008, Funchal, Madeira, Portugal, 22-25 Jan. 2008.

D. Ampeliotis, A. Antonakoudi, K. Berberidis and E. Z. Psarakis, "Computer Aided Detection of Prostate Cancer using Fused Information from Dynamic Contrast Enhanced and Morphological Magnetic Resonance Images," IEEE International Conference on Signal Processing and Communications, ICSPC 2007, Dubai, UAE, 24-27 Nov. 2007.

G. D. Evangelidis and E. Z. Psarakis, "Photometric Invariant Projective Registration using ECC Maximization," IEEE International Conference on Artificial Inteligence, ICTAI 2007, Patras, Greece, 29-31 Oct. 2007.

E-V. Pikoulis, E. Z. Psarakis and E. Sokos, "A New Two Step Correlation Based Technique for the Classification of Seismic Events," European Conference on Earthquake Engineering and Seismology, ECEES 2006, Geneva, Switzerland, 3-8 Sept. 2006.

I. G. Karibali, E. Z. Psarakis, K. Berberidis and G. D. Evangelidis, "Efficient Image Registration with Subpixel Accuracy," EUSIPCO-2006, Florence, Italy, 4-8 Sept. 2006.

E. Z. Psarakis and G. D. Evangelidis, "An Enhanced Correlation-Based Method for Stereo Correspondence with Sub-Pixel Accuracy," IEEE International Conference on Computer Vision, ICCV 2005, Beijing, China, 17-20 Oct. 2005.

E. Z. Psarakis, "A Weighted L2 Based Method for the Design of Arbitrary One Dimensional FIR Digital Filters," IEEE International Conference on Acoustics Speech and Signal Processing Vision, ICASSP 2003 Hong Kong, China, April 2003.

E. Psarakis and G.V. Moustakides, "Closed form expressions for optimum FIR polynomial predictive filtering," EUSIPCO-2002, Toulouse, France, Sept. 2002.

E.Dimas, E.Z. Psarakis, D. Briassoulis and G.V. Moustakides, "Three Dimensional Acquisition and NURBS based Geometric Modeling of Natural Objects," Saxe-Coburg Publications: ISBN 0984-749-55-5 Edited by B.H.V. Topping, Proceedings, Advances in Engineering Computational Technology, 1998.

B. Schulteib, D. Briasoulis, E. Dimas, E. Psarakis and G. Henning, "Use of advanced techniques to directly create finite element models of biological objects," Proceedings of the 1997 IEEE International Conference, on Information Technology Applications in Biomedicine, Prague Sept. 1997.

E. Z. Psarakis and G. V. Moustakides, "Acceleration of the Remez Exchange Algorithm for the Design of L΅ Optimum FIR Filters," , Proceedings, 13th International Conference on Digital Signal Processing, Santorini, July 1997.

Liavas A.P., Moustakides G.V., Henning G., Psarakis E.Z., Husar P., "On the Detection of Steady State Visually Evoked Potentials," , Proceedings, IEEE Int. Conference Engineering in Medicine and Biology, Amsterdam, Nov. 1996.

Ε. Z. Psarakis and G. V. Moustakides, "An L2 Based Method for the Design of One Dimensional FIR Digital Filters," Proccedings of the Third IEEE ICECS '96 Rodoes 1996.

E. Z. Ψαράκης και Γ. Β. Μουστακίδης, "Μια νέα L2 Μέθοδος για την Σχεδίαση Μονοδιάστατων FIR ψηφιακών Φίλτρων," Πρακτικά Συνεδρίου "Τεχνολογία & Αυτοματισμός" ΤΕΙ Πειραιά, Αθήνα, Μαϊος 1996.


Original Title: "Signal Processing First," by James H. McClellan, Ronald W. Scafer and Mark A. Yoder, Prentice Hall Inc., 2005.
Title in Greek: "Θεμελιώδεις Έννοιες της Επεξεργασίας Σημάτων," Εκδόσεις Φιλομάθεια, 2006.

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