PREVISION – Multimodal Data Fusion and Analytics Group

ITI-CERTH participation in ActEV and AVS Tracks of TRECVID 2021

K. Gkountakos, D. Galanopoulos, D. Touska, K. Ioannidis, S. Vrochidis, V. Mezaris, I. Kompatsiaris, "ITI-CERTH participation in ActEV and AVS Tracks of TRECVID 2021.", in Proceedings of the TRECVID 2021 Workshop, Gaithersburg, MD, USA (Virtual), 2021.

Spatio-temporal activity detection and recognition in untrimmed surveillance videos

K. Gkountakos, D. Touska, K. Ioannidis, T. Tsikrika, S. Vrochidis, I. Kompatsiaris, "Spatio-temporal activity detection and recognition in untrimmed surveillance videos.",in Proceedings of the 2021 International Conference on Multimedia Retrieval, August 2021.

Crowd Violence Detection from Video Footage

K. Gkountakos, K. Ioannidis, T. Tsikrika, S. Vrochidis, I. Kompatsiaris, "Crowd Violence Detection from Video Footage.", in Proceedings of the 2021 International Conference on Content-Based Multimedia Indexing (CBMI), IEEE, June 2021.

ITI-CERTH participation in TRECVID 2019

K. Gkountakos, K. Ioannidis, S. Vrochidis, I. Kompatsiaris, "ITI-CERTH participation in TRECVID 2019.", in Proceedings of the TRECVID 2019 Workshop, Gaithersburg, MD, USA, November 2019.

ITI-CERTH participation in TRECVID 2020

K. Gkountakos, D. Galanopoulos, M. Mpakratsas, D. Touska, A. Moumtzidou, K. Ioannidis, I. Gialampoukidis, S. Vrochidis, V. Mezaris, I. Kompatsiaris, "ITI-CERTH participation in TRECVID 2020.", in Proceedings of the TRECVID 2020 Workshop, Gaithersburg, MD, USA, December 2020.

Dark Web Ιnvestigation

B. Akhgar, M. Gercke, S. Vrochidis, H. Gibson (2021). Dark Web investigation. 288 Pages, Springer.

OSINT and the Dark Web

G. Kalpakis, T. Tsikrika, N. Cunningham, C. Iliou, S. Vrochidis, J. Middleton, I. Kompatsiaris, "OSINT and the Dark Web", in Open Source Intelligence Investigation: From Strategy to Implementation, B. Akhgar, P. S. Bayerl, F. Sampson, Eds., Cham, Switzerland: Springer, 3 January, 2017, pp. 111–132.

Analysis of Suspended Terrorism-Related Content on Social Media

G. Kalpakis, T. Tsikrika, I. Gialampoukidis, S. Papadopoulos, S. Vrochidis, I. Kompatsiaris, "Analysis of Suspended Terrorism-Related Content on Social Media", in Community-Oriented Policing and Technological Innovations, G. Leventakis and M. R. Haberfeld, Eds., Cham, Switzerland: Springer, 27 April, 2018, pp. 107–118.

Utilizing Implicit User Feedback to Improve Interactive Video Retrieval

S. Vrochidis, I. Kompatsiaris, I. Patras, "Utilizing Implicit User Feedback to Improve Interactive Video Retrieval", Advances in Multimedia, vol. 2011, no. 1, 24 March, 2011.

Interactive video search tools: a detailed analysis of the video browser showdown 2015

C. Cobarzan, K. Schoeffmann, W. Bailer, W. Hurst, A. Blazek, J. Lokoc, S. Vrochidis, K. Uwe Barthel, L. Rossetto, "Interactive video search tools: a detailed analysis of the video browser showdown 2015", Multimedia Tools Appl., vol. 76, pp. 5539-5571, 4 February, 2017.

TENSOR: Retrieval and Analysis of Heterogeneous Online Content for Terrorist Activity Recognition

B. Akhgar, P. Bertrand, C. Chalanouli, T. Day, I. Fragkiadakis, H. Gibson, D. Kavallieros, E. Kermitsis, I. Kompatsiaris, E. Kyriakou, G. Leventakis, E. Lissaris, S. Mille, D. Myttas, T. Tsikrika, S. Vrochidis, U. Williamson, "TENSOR: Retrieval and Analysis of Heterogeneous Online Content for Terrorist Activity Recognition", Proceedings of the Estonian Academy of Security Sciences: Secure Societies, pp. 33-82, 15 June, 2017.

Interactive Search or Sequential Browsing? A Detailed Analysis of the Video Browser Showdown 2018

J. Lokoc, G. Kovalcik, B. Munzer, K. Schoffmann, W. Bailer, R. Gasser, S. Vrochidis, P. Anh Nguyen, S. Rujikietgumjorn, K. Uwe Barthel, "Interactive Search or Sequential Browsing? A Detailed Analysis of the Video Browser Showdown 2018", ACM Transactions on Multimedia Computing, Communications, and Applications (TOMM), vol. 15, no. 1, pp. 1 - 18, 1 February, 2019.

Big Data Analytics for Large-Scale Multimedia Retrieval

S. Vrochidis, B. Huet, E. Chang, I. Kompatsiaris (2019). Big Data Analytics for Large-Scale Multimedia Retrieval. 348 Pages, Wiley.

Detection of Ter-rorism-related Twitter Communities using Centrality Scores

I. Gialampoukidis, G. Kalpakis, T. Tsikrika, S. Papadopoulos, S. Vrochidis, I. Kompatsiaris, "Detection of Terrorism-related Twitter Communities using Centrality Scores", in Proceedings of the International Workshop on Multimedia Forensics and Security (MFSec 2017), Bucharest, Romania, June 06, 2017.

Analysis of Suspended Terrorism-Related Content on Social Media

G. Kalpakis, T. Tsikrika, I. Gialampoukidis, S. Papadopoulos, S. Vrochidis, I. Kompatsiaris, "Analysis of Suspended Terrorism-Related Content on Social Media", in Proceedings of the Community-Oriented Policing and Technological Innovations, 2018, pp. 107-118.