Stefan Atev / Résumé
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Stefan E. Atev

Education

University of Minnesota Minneapolis, MN
Ph.D., Computer Science (expected 2010)
Dissertation topic: “Kernels for Trajectories and Time Series”
M.S., Computer Science (May 2007)
Advisor: Nikolaos Papanikolopoulos; GPA 4.0
Honors & Activities:
  • Best Paper award for “Kernel Spectral Curvature Clustering (KSCC)” in ICCV 2009 Workshop on Dynamical Vision (Kyoto, Japan)
  • Finalist, ACM World Programming Finals 2004 (Prague, Czech Rep.)
  • Chair, ITSC 2004 Systems Monitoring session (Washington, DC)
Luther College Decorah, IA
B.A., summa cum laude (July 2003)
Computer Science and Mathematics
Honors & Activities:
  • Phi Beta Kappa, Sigma Pi Sigma, Pi Mu Epsilon
  • Meritorious, 2002 COMAP Mathematical Modeling Competition
  • Finalist, ACM World Programming Finals 2001 (Vancouver, BC)

Research Interests

Medical imaging, kernel methods for machine learning, image processing, Real-time computer vision systems (frame-rate vision), high-performance scientiffic computing.

Publications

S. Atev, G. Miller, and N. Papanikolopoulos, “Clustering of Vehicle Trajectories”, to appear in IEEE Trans. Intelligent Transportation Systems, 2010.
J. Hellinger, S. Atev, and M. Epelman, “Low Dose Chest CT Angiography (CTA): Improved Image Quality with a Novel Noise Reduction Algorithm”, Pediatric Radiology, vol. 40, no. 4, pp. 561−562, Apr. 2010.
G. Chen, S. Atev, and G. Lerman, “Kernel Spectral Curvature Clustering (KSCC)”, Proc. IEEE Int'l Conf. Computer Vision (ICCV 2009), pp. 765−772, Sep. 2009.
E. Ribnick, S. Atev, and N. Papanikolopoulos, “Estimating 3D Positions and Velocities of Projectiles from Monocular Views”, IEEE Trans. Pattern Analysis and Machine Intelligence, vol. 31, no. 5, pp. 938−944, May 2009.
G. Miller, S. Atev, and N. Papanikolopoulos, “Detecting Static Occlusion Edges Using Foreground Patterns”, Proc. Mediterranian Conf. Control and Automation (MED 2009), pp. 952−957, June 2009.
S. Atev and N. Papanikolopoulos, “Multi-View 3D Vehicle Tracking with a Constrained Filter”, Proc. IEEE Conf. Robotics and Automation (ICRA 2008), pp. 2277−2282, May 2008.
E. Ribnick, S. Atev, O. Masoud, N. Papanikolopoulos, and R. Voyles, “Detection of Thrown Objects in Indoor and Outdoor Scenes”, Proc. IEEE/RSJ Int'l Conf. Intelligent Robots and Systems (IROS 2007), pp. 979−984, Oct. 2007.
A. Joshi, S. Atev, O. Masoud, and N. Papanikolopoulos, “Moving Shadow Detection with Low- and Mid-Level Reasoning”, Proc. IEEE Conf. Robotics and Automation (ICRA 2007), pp. 4827−4832, Apr. 2007.
H. Veeraraghavan, N. Bird, S. Atev, N. Papanikolopoulos, and P. Schrater, “Classifiers for Driver Activity Monitoring”, Transportation Research Part C: Emerging Technologies, vol. 15, no. 1, pp. 51−67, Feb. 2007.
E. Ribnick, S. Atev, O. Masoud, N. Papanikolopoulos, and R. Voyles, “Real-Time Detection of Camera Tampering”, Proc. IEEE Int'l Conf. Advanced Video and Signal based Surveillance (AVSS 2006), pp. 10−10, Nov. 2006.
S. Atev, O. Masoud, and N. Papanikolopoulos, “Learning Traffic Patterns at Intersections by Spectral Clustering of Motion Trajectories”, Proc. IEEE/RSJ Int'l Conf. Intelligent Robots and Systems (IROS 2006), pp. 4851−4856, Oct. 2006.
N. Bird, S. Atev, N. Caramelli, R. Martin, O. Masoud, and N. Papanikolopoulos, “Real-Time, Online Detection of Abandoned Objects in Public Areas”, Proc. IEEE Conf. Robotics and Automation (ICRA 2006), pp. 3775−3780, May 2006.
S. Atev, H. Arumugam, O. Massoud, R. Janardan, and N. Papanikolopoulos, “A Vision-Based Approach to Collision Prediction at Traffic Intersections”, IEEE Trans. Intelligent Transportation Systems, vol. 6, no. 4, pp. 416−423, Dec. 2005.
H. Veeraraghavan, S Atev, N. Bird, P. Schrater, and N. Papanikolopoulos, “Driver Activity Monitoring through Supervised and Unsupervised Learning”, Proc. IEEE Conf. Intelligent Transportation Systems (ITSC 2005), pp. 895−900, Sep. 2005.
S. Atev, O. Masoud, R. Janardan, and N. Papanikolopoulos, “A Collision Prediction System for Traffic Intersections”, Proc. IEEE/RSJ Int'l Conf. Intelligent Robots and Systems (IROS 2005), pp. 2844−2849, Aug. 2005.
S. Atev, O. Masoud, and N. Papanikolopoulos, “Practical Mixtures of Gaussians with Brightness Monitoring”, Proc. IEEE Conf. Intelligent Transportation Systems (ITSC 2004), pp. 423−428, Oct. 2004.

Peer Review

Served as a reviewer for the following publications and conferences: Image and Vision Computing Journal (IMAVIS), J. Intelligent and Robotic Systems, IEEE Trans. Intelligent Transportation Systems, Transportation Research Record: J. Transportation Research Board, IEEE Int'l Conf. Advanced Video and Signal Based Surveillance (AVSS), IEEE Conf. Robotics and Automation (ICRA), IEEE Conf. Intelligent Transportation Systems (ITSC), IEEE/RSJ Int'l Conf. Intelligent Robots and Systems (IROS).

Work Experience

Vital Images, Inc. Minnetonka, MN
Senior Scientist, Algorithm Development Mar. 2010 − present
Scientist, Algorithm Development Jun. 2008 − Feb. 2010
  • Reserach methods for diffeomorphic nonlinear registration in body perfusion and longitudinal clinical applications.
  • Develop a general, edge-preserving volumetric denoising algorithm for CT and MR.
  • Implement a parallel, lock-free marching cubes algorithm for a 3D object editing tool.
  • Responsible for all aspects of CT Brain Perfusion application, including validation, maintenance of legacy code, and novel research.
  • Optimize low-level volume processing algorithms for multi-core architectures.
  • Develop novel algorithms for deconvolution in brain, body, and myocardial perfusion.
University of Minnesota Minneapolis, MN
Research Assistant Jan. 2004 − May 2008
  • Designed and implemented computer vision system for real-time distributed video surveillance and threat assesment at mass transit sites.
  • Created vision algorithms for traffic monitoring/automated data collection.
  • Developed vision methods for in-car driver distraction detection.
Vital Images, Inc. Minnetonka, MN
Scientist Intern, Algorithm Group May 2007 − Aug. 2007
  • Designed a generic separable filter framework for volumetric data.
  • Improved performance of 3D binary morphology and CT brain perfusion routines.
  • Created an initial prototype of a colon polyp detection system and investigated false-positive reduction methods.
University of Minnesota Minneapolis, MN
Teaching Assistant Sep. 2003 − Dec. 2003
  • Prepared and led weekly recitations for CSci 2011 “Numerical Methods.”
  • Assisted students with course material during office hours and graded assignments.
IBM, Internet Technology Group Cambridge, MA
Programmer Sep. 2001 − Jul. 2003
  • Designed an RDF browser for life sciences data and demonstrated it at BioIT 2003.
  • Developed a reference implementation of the OMG Life Science Identifiers specification.
  • Exposed the SwissProt, LocusLink and PDB databases as LSID web services.
  • Created support modules for using XPCOM (cross-platform COM) with Java.
  • Implemented an IDL compiler targeting Java and a Java interface decompiler.
Luther College, Psychology Dept. Decorah, IA
Staff Programmer Jan. 2000 − Dec. 2003
  • Developed applications for psychological experiments.
  • Maintained departmental network and computer lab.
  • Designed applications for the statistical analysis of experimental data.
IBM, Extreme Blue Internship Program Cambridge, MA
Programmer, SashXB team Jun. 2001 − Aug. 2001
  • Designed an Integrated Development Environment for JavaScript.
  • Developed a component framework for rapid application development on Linux.
  • Integrated RAD components with the Mozilla and GNOME projects.

Computer Skills

LanguagesC++, Matlab, x86 assembly, C, Java, C#, Object Pascal, Perl
TechnologiesOpenMP, IPL/IPP, JNI, GTK+, RDF, XPCOM, SWT, SOAP/WSDL