Gavriil Tsechpenakis
Visiting Assistant Professor
Electrical and Computer Engineering
University of Miami
1251 Memorial Drive, #EB512
Coral Gables, FL 33146
Tel: 1.305.284.3340
Personal Pages: http://www.eng.miami.edu/~gavriil/
EDUCATION TEACHING RESEARCH PROJECTS PUBLICATIONS
EXPERIENCE LANGUAGE OPPORTUNITIES
EDUCATION:
2003: Ph.D. ECE, National Technical University of Athens, Greece
1999: B.S. ECE, National Technical University of Athens, Greece
TEACHING:
EEN 336 - Signals and Systems
EEN 436 - Introduction to Digital Signal Processing
EEN 536 - Digital Signal Processing
I conduct both theoretical and applied research in the areas of computer vision, image processing, machine learning, and biomedical image analysis. My goal is to develop novel fully automated methods that can provide robustness, accuracy and computational efficiency. I am working towards finding better solutions to existing open problems in the above areas, as well as exploring different scientific fields where my research can provide useful interpretation, quantification and modeling.
1. Textured objects segmentation
2. Multi-class object detection and recognition
3. 2D and 3D segmentation of low and ultra-high resolution Optical Coherence Tomography data (retinal tumor detection and study of the human tear dynamics).
4. Simultaneous tracking of multiple C. elegans swimming and extraction of locomotion features for aging analysis and phenotype classification
5. Automated detection and recognition of specimens in images acquired with a new In Situ Ichthyoplankton Imaging System (ISIIS)
6. American sign language recognition
7. Tracking in clutter
8. Cells and cell vesicles structure and motion modeling
2008
G. Tsechpenakis, L. Bianchi, D. Metaxas, and M. Driscoll, "A Novel Computational Approach for Simultaneous Tracking and Feature Extraction of C. elegans Populations in Fluid Environments," IEEE Trans. on Biomedical Engineering, to appear in April 2008.
2007
G. Tsechpenakis, J. Wang, B. Mayer, and D. Metaxas, "Coupling CRFs and Deformable Models for 3D Medical Image Segmentation," IEEE Mathematical Methods in Biomedical Image Analysis, IEEE Int'l Conf. on Computer Vision, Rio de Janeiro, Brazil, Oct. 2007.
G. Tsechpenakis, L. Bianchi, M. Driscoll, and D. Metaxas, "Tracking C. elegans Populations in Fluid Environments for the Study of Different Locomotory Behaviors," 2nd Int'l Workshop on Microscopic Image Analysis with Applications in Biology, Piscataway, NJ, Sept. 2007.
G. Tsechpenakis, and D. Metaxas, "CRF-driven Implicit Deformable Model," IEEE Conference on Computer Vision and Pattern Recognition (CVPR'07), Minneapolis, MN, June 2007.
G. Tsechpenakis, and J. Wang, "CRF-based Segmentation of Human Tear Meniscus Obtained with Optical Coherence Tomography," IEEE International Conference on Image Processing (ICIP'07), San Antonio, TX, September 2007.
G. Tsechpenakis, D. Metaxas, and C. Neidle, "Combining Discrete and Continuous 3D Trackers," Human Motion - Understanding, Modeling, Capture and Animation, Springer, to appear in 2007.
G. Tsechpenakis, C. Guigand, and R. Cowen, "Image analysis techniques to accompany a new In Situ Ichthyoplankton Imaging System (ISIIS)," IEEE OCEANS 2007, Aberdeen, Scotland, June 2007.
2006
D. Metaxas, G. Tsechpenakis, Z. Li, Y. Huang, and A. Kanaujia, "Dynamically Adaptive Tracking of Gestures and Facial Expressions," International Conference on Computational Science, The University of Reading, UK, May 2006.
G. Tsechpenakis, D. Metaxas, and C. Neidle, "Learning-based Coupling of Discrete and Continuous Trackers," Computer Vision and Image Understanding, 104(2-3), pp. 140-156, Nov/Dec 2006.
D. Metaxas, G. Tsechpenakis, Z. Li, Y. Huang, and A. Kanaujia, "Dynamically Adaptive Tracking of Gestures and Facial Expressions," Lecture Notes in Computer Science, Springer-Verlag, vol. 3993, pp. 554-561, 2006.
G. Tsechpenakis, L. Bianchi, L. Kotlyanskaya, D. Metaxas and M. Driscoll, "LocoWorm: A Program for Multiple Worms Tracking and Locomotion Features Extraction," Neuronal Development, Synaptic Function & Behavior, 2nd C. elegans Topic Meeting, Madison, Wisconsin, July 9-12, 2006.
G. Tsechpenakis, D. Metaxas, O. Hadjiliadis, and C. Neidle, "Robust Online Change-point Detection in Video Sequences," 2nd IEEE Workshop on Vision for Human Computer Interaction (V4HCI), in conjunction with IEEE Conference on Computer Vision and Pattern Recognition (CVPR'06), New York, NY, June 2006.
2005
T. O. Meservy, M. L. Jensen, J. Kruse, D. P. Twitchell, G. Tsechpenakis, J. K. Burgoon, D. N. Metaxas, J. F. Nunamaker Jr., "Deception Detection through Automatic Unobtrusive Analysis of Nonverbal Behavior," IEEE Intelligent Systems, Special Issue on Artificial Intelligence for National and Homeland Security, vol. 20(5), pp. 36-43, Sept/Oct 2005.
D. Metaxas and G. Tsechpenakis, "Dynamic Data Driven Coupling of Continuous and Discrete Methods for 3D Tracking," Lecture Notes in Computer Science, Springer-Verlag, vol. 3515, p. 712, April 2005.
G. Tsechpenakis, D. Metaxas, and C. Neidle, "Learning-based Dynamic Coupling of Discrete and Continuous Trackers," IEEE International Workshop on modeling People and Human Interaction (PHI'05), in conjunction with ICCV'05, Beijing, China, October 2005.
W. He, X. Huang, G. Tsechpenakis, D. Metaxas, and C. Neidle, "Discovery of Informative Unlabeled Data for Improved Learning," IEEE International Workshop on modeling People and Human Interaction (PHI'05), in conjunction with ICCV'05, Beijing, China, October 2005.
G. Tsechpenakis, D. Metaxas, M. Adkins, J. Kruse, M. Jensen, T. Meservy, D. Twitchell, A. Deokar and J. Nunamaker, "HMM-based Deception Recognition from Visual Cues," IEEE International Conference on Multimedia & Expo (ICME'05), Amsterdam, The Netherlands, July 2005.
G. Tsechpenakis, D. Metaxas and S. Lu, "Analysis and Recognition of Nonverbal Behavior Using 2D Visual Cues and Machine Learning," Project Panel: Machine Learning Technology for Recognition and Analysis of Suspicious Behavior from Human Gestures and Movement, 2nd Conference of the International Society for Gesture Studies (ISGS), Interacting Bodies, Lyon, France, June 2005.
D. Metaxas, and G. Tsechpenakis, "Dynamic Data Driven Coupling of Continuous and Discrete Methods for 3D Tracking," International Conference on Computational Science, (ICCS'05), Atlanta, USA, May, 2005.
S. Lu, G. Tsechpenakis, D. Metaxas, M. L. Jensen, and J. Kruse, "Blob Analysis of the Head and Hands: A Method for Deception Detection and Emotional State Identification," Hawaii International Conference on System Sciences, Big Island, Hawaii, January 2005.
J. Burgoon, M. Adkins, J. Kruse, M. L. Jensen, T. Meservy, S. Lu, G. Tsechpenakis, and D. Metaxas, "An Approach for Intent Identification by Building on Deception Detection," Hawaii International Conference on System Sciences, Big Island, Hawaii, January 2005.
2004
G. Tsechpenakis, K. Rapantzikos, N. Tsapatsoulis and S. Kollias, "A Snake Model for Object Tracking in Natural Sequences," Elsevier, Signal Processing: Image Communication, Vol. 19(3), pp. 219-238, March 2004. In the "10 most requested articles".
G. Tsechpenakis, K. Rapantzikos, N. Tsapatsoulis, S. Kollias, "Rule-driven Object Tracking in Clutter and Partial Occlusion with Model-based Snakes," EURASIP Journal on Applied Signal Processing, Special Issue on Object-based Semantic Image and Video Analysis, vol. 2004(6), pp. 841-860, June 2004.
G. Tsechpenakis, N. Tsapatsoulis and S. Kollias, "Probabilistic Boundary-Based Contour Tracking with Snakes in Natural Cluttered Video Sequences," International Journal of Image and Graphics (IJIG): Special Issue on Deformable Models for Image Analysis and Pattern Recognition, Vol. 4(3), pp. 469-498, 2004.
P. Tzouveli, G. Andreou, G. Tsechpenakis, Y. Avrithis and S. Kollias, "Intelligent Visual Descriptor Extraction from Video Sequences," Lecture Notes in Computer Science - Adaptive Multimedia Retrieval, Springer-Verlag, Vol. 3094, pp. 132-146, 2004.
2003
V. Tzouvaras, G. Tsechpenakis, G. Stamou and S. Kollias, "Adaptive Rule-based Recognition of Events in Video Sequences," IEEE International Conference on Image Processing (ICIP), Barcelona, Spain, September 2003.
P. Tzouveli, G. Andreou, G. Tsechpenakis, Y. Avrithis and S. Kollias, "Intelligent Visual Descriptor Extraction from Visual Sequences," International Workshop on Adaptive Multimedia Retrieval, KI 2003, Hamburg, Germany, September 2003.
G. Tsechpenakis, K. Rapatzikos, N. Tsapatsoulis and S. Kollias, "Object Tracking in Clutter and Partial Occlusion through Rule-driven Utilization of Snakes," IEEE International Conference on Multimedia & Expo, Baltimore, USA, July 2003.
2002
G. Tsechpenakis, G. Akrivas, G. Andreou, G. Stamou and S. Kollias, "Knowledge - Assisted Video Analysis and Object Detection," EUNITE 2002: European Symposium on Intelligent Technologies, Hybrid Systems and their Implementation on Smart Adaptive Systems, Albufeira, Portugal, September 2002.
2001
G. Tsechpenakis, Y. Xirouhakis and A. Delopoulos, "A Multiresolution Approach for Main Mobile Object Localization in Video Sequences," International Workshop on Very Low Bitrate Video Coding (VLBV01), Athens, Greece, October 2001.
2000
G. Tsechpenakis, Y. Xirouhakis, and A. Delopoulos, "Main Mobile Object Detection and Localization in Video Sequences," Lecture Notes in Computer Science - Advances in Visual Information Systems, Springer-Verlag, Vol. 1929, pp. 84-95, 2000.
1999
Y. Xirouhakis, G. Tsechpenakis and A. Delopoulos, "User Choices for Efficient 3D Motion and Shape Extraction from Orthographic Projections," The Sixth IEEE International Conference on Electronics, Circuits and Systems (ICECS99), Pafos, Cyprus, September 1999.
G. Tsechpenakis, Y. Xirouhakis and A. Delopoulos, "2D Motion Estimation in the Extraction of 3D Motion and Structure of Rigid Objects," International Workshop on Synthetic-Natural Hybrid Coding and 3D Imaging (IWSNHC3DI'99), Santorini, Greece, September 1999.
G. Tsechpenakis, Y. Avtithis and S. Kollias, "Verification Report of Core Experiment on Fast Block-Matching Motion Estimation using Advanced Diamond Zonal Search with Embedded Radar," International Organization for Standardization, ISO/IEC JTC1/SC29/WG11, MPEG99/M5116, October 1999.
EXPERIENCE:
2007 - present, Visiting Assistant Professor, University of Miami
2005 - 2006, Research Associate, Rutgers University
2003 - 2005, Postdoctoral Fellow, Rutgers University
LANGUAGE:
English, Greek, German
OPPORTUNITIES:
Research Assistantship and Post-Doctoral positions may be available in related research areas. If interested, please send a brief resume to gavriil@miami.edu
