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Dr. Panagiotis Sidiropoulos

Imaging Group

Post-doctoral research associate

Tel: +44 (0)1483 204 149

Fax: +44 (0)1483 278 312

Internal: 2149

Room: Boyd Centre Room C

Email:  p.sidiropoulos{at} ucl.ac.uk

Research Interests

  • Machine Learning

    • Pattern Recognition, clustering and classification
    • Support Vector Machines, Genetic Algorithms, Meta-heuristic algorithms, neural networks, Bayesian networks/
    • Metrics and similarity
    • Information extraction from planetary data
  • Image Processing

    • Image registration and matching, stereo
    • Image descriptors, content-based image retrieval, multimedia indexing
    • Image authentication, watermarking
  • Video processing

    • Video temporal segmentation (scene segmetnation, shot segmentation), summarization
    • Concept and event detection
    • Multimedia indexing and retrieval

Qualifications

  • B.Sc. Electrical and Electronic Engineering, Aristotle University of Thessaloniki, 2003.
  • M.Sc. Informatics, Computer Science Department, Aristotle University of Thessaloniki. 2007.
  • Ph.D.  Machine learning / Multimedia Processing, University of Surrey, 2012.

Professional History

July 2013 - : Post-doctoral research associate in Mullard Space Science Laboratory, University College London.

July 2012 - June 2013:
Post-doctoral research associate in Multimedia Knowledge Laboratory, Information Technologies Institute, Centre of Research and Technology Hellas. Participation in EU FP7 project LinkedTV.

June 2008 - July 2012: Research associate in Multimedia Knowledge Laboratory, Information Technologies Institute, Centre of Research and Technology Hellas. Participation in EU FP6 and FP7 projects Vidi-Video and GLOCAL.

January 2007 - April 2007: Research associate in Multimedia Knowledge Laboratory, Information Technologies Institute, Centre of Research and Technology Hellas. Participation in EU FP6 project PATExpert.

October 2005 - July 2006:
Research Associate in Artificial Intelligence and Information Analysis Lab, Department of Informatics, Aristotle University of Thessaloniki. Participation in EU FP6 project ECRYPT.

Publications

Journal Publications

  • P. Sidiropoulos, V. Mezaris, I. Kompatsiaris, J. Kittler, "Differential Edit Distance: A metric for scene segmentation evaluation", IEEE Transactions on Circuits and Systems for Video Technology, Vol. 22, No. 6, pp. 904-914, 2012.
  • P. Sidiropoulos, S. Vrochidis, I. Kompatsiaris "Content-based binary image retrieval using the adaptive hierarchical density histogram", Pattern Recognition, Vol. 44, No. 4, pp. 739-750, 2011.
  • P. Sidiropoulos, V. Mezaris, I. Kompatsiaris, H. Meinedo, M. Bugalho, I. Trancoso, "Temporal video segmentation to scenes using high-level audiovisual features", IEEE Transactions on Circuits and Systems for Video Technology, Vol. 21, No. 8, pp. 1163-1177, 2011.
  • S. Vrochidis, S. Papadopoulos, A. Moumtzidou, P. Sidiropoulos, E. Pianta and I. Kompatsiaris, "Towards content-based patent image retrieval: A framework perspective", in World Patent Information Journal, Vol. 32, No. 2, pp. 94-106, 2010.
  • P. Sidiropoulos, N. Nikolaidis, I. Pitas, "Invertible chaotic fragile watermarking for robust image authentication", in Chaos, Solitons & Fractals, Vol. 42, No. 5, pp. 2667-2674, 2009.

Book Chapters

  • E. Apostolidis, P. Sidiropoulos, V. Mezaris, I. Kompatsiaris, "Visual Information Analysis for Interactive TV applications", Encyclopedia of Information Science and Technology, IGI Global, 2013, to appear.
  • P. Sidiropoulos, V. Mezaris, I. Kompatsiaris, H. Meinedo, M. Bugalho, I. Trancoso, "On the use of audio events for improving video scene segmentation", in book: Analysis, Retrieval and Delivery of Multimedia Contents [tentative title], N. Adami, A. Cavallaro, R. Leonardi, P. Migliorati (Eds.), Springer, 2011

Conference Publications

  • P. Sidiropoulos, V. Mezaris, I. Kompatsiaris, "Enhancing video concept detection with the use of tomographs", Proc. IEEE International Conference on Image Processing (ICIP 2013), Melbourne, Australia, September 2013.
  • A Moumtzidou, N. Gkalelis, P. Sidiropoulos, M. Dimopoulos, S. Nikolopoulos, S. Vrochidis, V. Mezaris, I. Kompatsiaris,  "ITI-CERTH participation to TRECVID 2012", in Proceedings of TRECVID 2012 Workshop, November 2012, Gaithersburg, MD, USA.
  • P. Sidiropoulos, V. Mezaris, I. Kompatsiaris, "Differential Edit Distance As A Countermeasure To Video Scene Ambiguity", 2012 IEEE International Workshop on Machine Learning for Signal Processing (MLSP 2012), Santander, Spain, September 2012.
  • V. Mezaris, P. Sidiropoulos, I. Kompatsiaris, "Improving interactive video retrieval by exploiting automatically-extracted video structural semantics", Proc. Fifth IEEE International Conference on Semantic Computing (ICSC 2011), Palo Alto, CA, USA, September 2011.
  • A. Moumtzidou, P. Sidiropoulos, S. Vrochidis, N. Gkalelis, S. Nikolopoulos, V. Mezaris, I. Kompatsiaris, I. Patras, "ITI-CERTH participation to TRECVID 2011", in Proceedings of TRECVID 2011 Workshop, Gaithersburg, MD, USA, December 2011.
  • V. Mezaris, P. Sidiropoulos, A. Dimou, I. Kompatsiaris, "On the use of visual soft semantics for video temporal decomposition to scenes", Proc. Fourth IEEE International Conference on Semantic Computing (ICSC2010), Pittsburgh, PA, USA, September 2010.
  • P. Sidiropoulos, V. Mezaris, I. Kompatsiaris, H. Meinedo, M. Bugalho, I. Trancoso, "On the use of audio events for improving video scene segmentation" Proc. 11th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2010), Desenzano del Garda, Italy, April 2010.
  • P. Sidiropoulos, S. Vrochidis, I. Kompatsiaris, "Adaptive Hierarchical Density Histogram for Complex Binary Image Retrieval", Proc. 8th International Workshop on Content-Based Multimedia Indexing (CBMI 2010), Grenoble, France, 23-25 June, 2010.
  •  P. Sidiropoulos, V. Mezaris, I. Kompatsiaris, H. Meinedo, I. Trancoso, "Multi-Modal Scene Segmentation Using Scene Transition Graphs", Proc. ACM International Conference on Multimedia (MM09), Beijing, China, pp. 665-668, October 2009.
  • S. Nikolopoulos, S. Zafeiriou, P. Sidiropoulos, N. Nikolaidis and I. Pitas: "Image Replica detection using R-trees and Linear Discriminant Analysis", in Proc. of the IEEE Int. Conf. on Multimedia and Expo (ICME 2006), Toronto, Ontario, Canada, 9-12 July, 2006.

Demos

  • P. Sidiropoulos, V. Mezaris, I. Kompatsiaris, H. Meinedo, M. Bugalho, I. Trancoso, "Video Scene Segmentation System Using Audio-Visual Features", Proc. 12th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2011), Delft, Netherlands, 13-15 April, 2011.

Outreach

Activities

IEEE Member from 2012.

Member of the Technical Chamber of Greece, from 2004.

Researchgate Profile: https://www.researchgate.net/profile/Panagiotis_Sidiropoulos

MSSL: http://www.ucl.ac.uk/mssl

UCL: http://www.ucl.ac.uk/

Page last modified on 12 nov 13 14:47