Biography | Publications

Dr. Perera’s current research is in video image analysis including moving object detection, tracking, and object recognition to derive high-level understanding from video (e.g., via activity recognition). He is also interested in active vision, robust statistics and estimation, and image segmentation. Dr. Perera's research in video is focused on developing robust algorithms that can be applied to real-world data, and in particular on developing mechanisms to cope gracefully with failure.  

Dr. Perera received his B.S., B.S. (Hons), and M.S. degrees from the University of the Witwatersrand, Johannesburg, South Africa, and his Ph.D. from Rensselaer Polytechnic Institute. Prior to joining Kitware, Dr. Perera was at the Visualization and Computer Vision group at GE Global Research, where he was involved in a number of projects spanning aerial and ground video analysis, satellite and aerial image analysis, computer-aided detection in mammography, and iris biometrics.

Publications

A. G. A. Perera, R. Collins, and A. Hoogs. "Evaluation of Compression Schemes for Wide Area Video". Proceedings IEEE Applied Imagery Pattern Recognition Workshop (AIPR). Washington, DC. 14 Oct 2008.

E. Swears, A. Hoogs, and A. G. A. Perera. "Learning Motion Patterns in Surveillance Video using HMM Clustering" . Proceedings of the IEEE Workshop on Motion and Video Computing. Copper Mountain, CO. 9 Jan 2008.

A. Hoogs, S. Bush, G. Brooksby, A. G. A. Perera, M. Dausch, and N. Krahnstoever. "Detecting Semantic Group Activities Using Relational Clustering". Proceedings IEEE Visual Motion Computing (MOTION) Workshop. Copper Mountain, CO. 9 Jan 2008.

P. Tu, F. Wheeler, N. Krahnstoever, T. Sebastian, J. Rittscher, X. Liu, A. Perera, and G. Doretto. "Surveillance video analytics for large camera networks." SPIE Newsletter, 2007.

P. H. Tu, G. Doretto, N. O. Krahnstoever, A. G. A. Perera, F. W. Wheeler, X. Liu, J. Rittscher, T. B. Sebastian, T. Yu, and K. G. Harding. "An intelligent video framework for homeland protection". SPIE Defense and Security Symposium (DSS), Unattended Ground, Sea, and Air Sensor Technologies and Applications IX. Orlando, FL, 9-13 Apr 2007.

A. G. A. Perera, A. Hoogs, C. Srinivas, G. Brooksby, and W. Hu. "Evaluation of Algorithms for Tracking Multiple Objects in Video". Proceedings Applied Imagery Pattern Recognition (AIPR) Workshop. Washington, DC, 11-13 Oct 2006.

C.-L Tsai, C. V. Stewart, A. Perera, Y.-L. Lee, G. Yang, and M. Sofka. "A Correspondence-Based Software Toolkit for Image Registration". Proceedings IEEE International Conference on Systems, Man and Cybernetics (SMC). Taipei, Taiwan, 8-11 Oct 2006.

A. G. A. Perera, C. Srinivas, A. Hoogs, G. Brooksby, and W. Hu. "Multi-object tracking through simultaneous long occlusions and split-merge conditions". Proceedings IEEE Conference on Computer Vision and Pattern Recognition (CVPR). New York, NY, 17-22 Jun 2006.

M. T. Chan, A. Hoogs, R. Bhotika, A. G. A. Perera, J. Schmiederer, and G. Doretto. "Joint recognition of complex events and track matching". Proceedings IEEE Conference on Computer Vision and Pattern Recognition (CVPR). New York, NY, 17-22 Jun 2006.

A. G. A. Perera, G. Brooksby, A. Hoogs, and G. Doretto. "Moving Object Segmentation using Scene Understanding." 5th IEEE Computer Society Workshop on Perceptual Organization in Computer Vision (in conjunction with CVPR 2006). New York, NY, 22 Jun 2006.

N. Krahnstoever, P. Tu, T. Sebastian, A. Perera, and R. Collins. "Multi-view detection and tracking of travelers and luggage in mass transit environments." 9th IEEE International Workshop on Performance Evaluation of Tracking and Surveillance (PETS) (in conjunction with CVPR 2006). New York, NY, 18 Jun 2006.

F. Wheeler, A. G. A. Perera, G. Peters, S. Muller, and R. Iodarche. "Micro-calcification detection in digital tomosynthesis mammography". SPIE Medical Imaging. San Diego, CA, 11-16 Feb 2006.

X. Liu, P. H. Tu, J. Rittscher, A. G. A. Perera, and N. Krahnstoever. "Detecting and counting people in surveillance applications". Proceedings International Conference on Advanced Video and Signal-based Surveillance. Como, Italy, 15-16 Sep 2005.

R. Kaucic, A. G. A. Perera, J. Kaufhold, G. Brooksby, and A. Hoogs. "A unified framework for tracking through occlusions and across sensor gaps." Proceedings IEEE Conference on Computer Vision and Pattern Recognition (CVPR). San Diego, CA, 20-26 Jun 2004.

A. G. A. Perera and A. Hoogs. "Bayesian object-level change detection in grayscale imagery." Proceedings International Conference on Pattern Recognition (ICPR), pp. 71-75. Cambridge, UK, 23-26 Aug 2004.

C. V. Stewart, C. L. Tsai, and A. Perera. "A view-based approach to registration: Theory and application to vascular image registration." Proceedings International Conference on Information Processing in Medical Imaging (IPMI), pp. 475-486. Ambleside, UK, 20-25 Jul 2003.

A. G. A. Perera. "Robust Region Extraction: Extracting model and domain parameters in the presence of multiple populations." Ph.D. thesis, Rensselaer Polytechnic Institute, Troy, NY, 2003.

A. Perera, C.-L. Tsai, R. Y. Flatland, and C. V. Stewart. "Maintaining valid topology with active contours: Theory and application." In Proceedings IEEE Conference on Computer Vision and Pattern Recognition (CVPR), vol. I, pp. 496-502. Hilton Head Island, SC, 13-15 Jun 2000.

C. V. Stewart, K. Bubna, and A. Perera "Estimating model parameters and boundaries by minimizing a joint, robust objective function." In Proceedings IEEE Conference on Computer Vision and Pattern Recognition (CVPR), pp. 387-393. Fort Collins, CO, 23-25 Jun 1999.

K. Goebel, V. Badami, and A. Perera "Diagnostic information fusion for manufacturing processes." In Proceedings 2nd International Conference on Information Fusion, vol. 1, pp. 31-336. Sunnyvale, CA, 6-8 Jul 1999.

A. Perera. "An Automated Theorem Prover for Simple Boolean Expressions." M.Sc. Research Report, University of the Witwatersrand, Johannesburg, South Africa, 1998.