Personal information

Verified email domains

Social media, social network analysis, multimedia mining, multimedia retrieval
Greece

Biography

I am a Senior Researcher with the Centre for Research and Technology Hellas (CERTH), the Information Technologies Institute, and part of the Multimedia Knowledge and Social Media Analytics Lab (MKLab). I am currently leading a team of approximately 20 researchers and engineers working in a number of projects at the intersection of Artificial Intelligence, Media, Multimedia Retrieval and Intelligent Network Analytics. In particular, during the last years, I have been interested in the topics of AI bias, online disinformation, media verification, and trend detection and forecasting using social media signals. I am currently leading the MediaVerse Innovation Action and I am part of the coordination team of the AI4Media Centre of AI Excellence. Other H2020 projects I am involved include WeVerify, HELIOS, NoBIAS and REBECCA. I have co-authored more than 30 journal articles and 100 conference papers and have served as TPC member in more than 50 conferences and I am a regular reviewer in more than 20 journals. Since 2014, I am one of the co-founders of the Infalia Private Company, a spin-off company of CERTH.

Activities

Employment (5)

Centre for Research and Technology Hellas: Thessaloniki, GR

2019-05-01 to present | Senior Researcher (Grade C') (Information Technology Institute)
Employment
Source: Self-asserted source
Symeon Papadopoulos

Centre for Research and Technology Hellas: Thessaloniki, GR

2012-03-01 to 2019-04-30 | Post-doctoral Research Fellow (Information Technology Institute)
Employment
Source: Self-asserted source
Symeon Papadopoulos

Centre for Research and Technology Hellas: Thessaloniki, GR

2007-07-01 to 2012-02-28 | Research Associate (Information Technologies Institute)
Employment
Source: Self-asserted source
Symeon Papadopoulos

Aristotle University of Thessaloniki: Thessaloniki, GR

2006-10-01 to 2007-06-30 | Research Associate (Electrical and Computer Engineering (THMMY))
Employment
Source: Self-asserted source
Symeon Papadopoulos

Technische Universiteit Eindhoven: Eindhoven, Noord-Brabant, NL

2004-09-01 to 2006-08-31 | Professional Doctorate in Engineering Trainee (TOIO) (Stan Ackermans Institute)
Employment
Source: Self-asserted source
Symeon Papadopoulos

Education and qualifications (4)

Aristotle University of Thessaloniki: Thessaloniki, GR

2008-01-30 to 2012-02-28 | Doctor of Philosophy (PhD) (School of Informatics)
Education
Source: Self-asserted source
Symeon Papadopoulos

Blekinge Tekniska Högskola: Karlskrona, SE

2007-09-01 to 2009-07-30 | Masters in Business Administration (MBA)
Education
Source: Self-asserted source
Symeon Papadopoulos

Technische Universiteit Eindhoven: Eindhoven, Noord-Brabant, NL

2004-09-01 to 2006-08-30 | Professional Doctorate in Engineering (PDEng) (Electrical Engineering)
Education
Source: Self-asserted source
Symeon Papadopoulos

Aristotle University of Thessaloniki: Thessaloniki, GR

1999-09-01 to 2004-06-30 | Diploma in Electrical and Computer Engineering (School of Electrical and Computer Engineering)
Education
Source: Self-asserted source
Symeon Papadopoulos

Funding (7)

vera.ai: VERification Assisted by Artificial Intelligence

2022-09-15 to 2025-09-14 | Grant
European Commission (Brussels, BE)
GRANT_NUMBER: 101070093
Source: Self-asserted source
Symeon Papadopoulos via DimensionsWizard

REBECCA - REsearch on BrEast Cancer induced chronic conditions supported by Causal Analysis of multi-source data

2021-04 to 2025-03 | Grant
European Commission (Brussels, BE)
GRANT_NUMBER: 965231
Source: Self-asserted source
Symeon Papadopoulos

MediaVerse - A universe of media assets and co-creation opportunities at your fingertips

2020-10 to 2023-09 | Grant
European Commission (Brussels, BE)
GRANT_NUMBER: 957252
Source: Self-asserted source
Symeon Papadopoulos

AI4Media - A European Excellence Centre for Media, Society and Democracy

2020-09 to 2024-08 | Grant
European Commission (Brussels, BE)
GRANT_NUMBER: 951911
Source: Self-asserted source
Symeon Papadopoulos

NoBIAS - Artificial Intelligence without Bias

2020-01 to 2023-12 | Grant
European Commission (Brussels, BE)
GRANT_NUMBER: 860630
Source: Self-asserted source
Symeon Papadopoulos

HELIOS: A Context-aware Distributed Social Networking Framework

2019-01 to 2021-12 | Grant
European Commission (Brussels, BE)
GRANT_NUMBER: 825585
Source: Self-asserted source
Symeon Papadopoulos

WeVerify - Wider and Enhanced Verification for You

2018-12 to 2021-11 | Grant
European Commission (Brussels, BE)
GRANT_NUMBER: 825297
Source: Self-asserted source
Symeon Papadopoulos

Works (50 of 210)

Items per page:
Page 1 of 5

Leveraging Representations from Intermediate Encoder-Blocks for Synthetic Image Detection

2025 | Book chapter
Contributors: Christos Koutlis; Symeon Papadopoulos
Source: check_circle
Crossref

FLAC: Fairness-Aware Representation Learning by Suppressing Attribute-Class Associations

IEEE Transactions on Pattern Analysis and Machine Intelligence
2024 | Journal article
Contributors: Ioannis Sarridis; Christos Koutlis; Symeon Papadopoulos; Christos Diou
Source: check_circle
Crossref

MINTIME: Multi-Identity Size-Invariant Video Deepfake Detection

IEEE Transactions on Information Forensics and Security
2024 | Journal article
Contributors: Davide Alessandro Coccomini; Giorgos Kordopatis Zilos; Giuseppe Amato; Roberto Caldelli; Fabrizio Falchi; Symeon Papadopoulos; Claudio Gennaro
Source: check_circle
Crossref

The Visual Saliency Transformer Goes Temporal: TempVST for Video Saliency Prediction

IEEE Access
2024 | Journal article
Contributors: Nikos Lazaridis; Kostas Georgiadis; Fotis Kalaganis; Giorgos Kordopatis-Zilos; Symeon Papadopoulos; Spiros Nikolopoulos; Ioannis Kompatsiaris
Source: check_circle
Crossref

Zero-Shot Content-Based Crossmodal Recommendation System

Expert Systems with Applications
2024-12 | Journal article
Contributors: Federico D’Asaro; Sara De Luca; Lorenzo Bongiovanni; Giuseppe Rizzo; Symeon Papadopoulos; Manos Schinas; Christos Koutlis
Source: check_circle
Crossref

Training in Co-Creation as a Methodological Approach to Improve AI Fairness

Societies
2024-12-03 | Journal article
Contributors: Ian Slesinger; Evren Yalaz; Stavroula Rizou; Marta Gibin; Emmanouil Krasanakis; Symeon Papadopoulos
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

PolyMeme: Fine-Grained Internet Meme Sensing

Sensors
2024-08-23 | Journal article
Contributors: Vasileios Arailopoulos; Christos Koutlis; Symeon Papadopoulos; Panagiotis C. Petrantonakis
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

The 2023 video similarity dataset and challenge

Computer Vision and Image Understanding
2024-06 | Journal article
Contributors: Ed Pizzi; Giorgos Kordopatis-Zilos; Hiral Patel; Gheorghe Postelnicu; Sugosh Nagavara Ravindra; Akshay Gupta; Symeon Papadopoulos; Giorgos Tolias; Matthijs Douze
Source: check_circle
Crossref

Cancer Patients’ Perspectives and Requirements of Digital Health Technologies: A Scoping Literature Review

Cancers
2024-06-21 | Journal article
Contributors: Ioulietta Lazarou; Anna-Maria Krooupa; Spiros Nikolopoulos; Lazaros Apostolidis; Nikos Sarris; Symeon Papadopoulos; Ioannis Kompatsiaris
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Credible, Unreliable or Leaked?: Evidence verification for enhanced automated fact-checking

2024-06-10 | Conference paper
Contributors: Zacharias Chrysidis; Stefanos-Iordanis Papadopoulos; Symeon Papadopoulos; Panagiotis Petrantonakis
Source: check_circle
Crossref

SIDBench: A Python framework for reliably assessing synthetic image detection methods

2024-06-10 | Conference paper
Contributors: Manos Schinas; Symeon Papadopoulos
Source: check_circle
Crossref

Towards Quantitative Evaluation of Explainable AI Methods for Deepfake Detection

2024-06-10 | Conference paper
Contributors: Konstantinos Tsigos; Evlampios Apostolidis; Spyridon Baxevanakis; Symeon Papadopoulos; Vasileios Mezaris
Source: check_circle
Crossref

FaceX: Understanding Face Attribute Classifiers through Summary Model Explanations

2024-05-30 | Conference paper
Contributors: Ioannis Sarridis; Christos Koutlis; Symeon Papadopoulos; Christos Diou
Source: check_circle
Crossref

MAD '24 Workshop: Multimedia AI against Disinformation

2024-05-30 | Conference paper
Contributors: Cristian Stanciu; Bogdan Ionescu; Luca Cuccovillo; Symeon Papadopoulos; Giorgos Kordopatis-Zilos; Adrian Popescu; Roberto Caldelli
Source: check_circle
Crossref

Universal Local Attractors on Graphs

Applied Sciences
2024-05-25 | Journal article
Contributors: Emmanouil Krasanakis; Symeon Papadopoulos; Ioannis Kompatsiaris
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Universal Local Attractors on Graphs

2024-04-19 | Preprint
Contributors: Emmanouil Krasanakis; Symeon Papadopoulos; Ioannis Kompatsiaris
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Integrity 2024: Integrity in Social Networks and Media

2024-03-04 | Conference paper
Contributors: Lluís Garcia-Pueyo; Symeon Papadopoulos; Prathyusha Senthil Kumar; Aristides Gionis; Panayiotis Tsaparas; Vasilis Verroios; Giuseppe Manco; Anton Andryeyev; Stefano Cresci; Timos Sellis et al.
Source: check_circle
Crossref

Helios.TALK: A decentralised messaging framework that preserves the privacy of users

Open Research Europe
2023-10-18 | Journal article
Contributors: Ioannis Sarridis; Vasiliki Gkatziaki; Emmanouil Krasanakis; Nikos Giatsoglou; Nikos Sarris; Symeon Papadopoulos; Ioannis Kompatsiaris
Source: check_circle
Crossref

Online Behaviour Indicator Extraction for Enhanced Cancer Patient Management using Real-World Data

2023-09-20 | Conference paper
Contributors: Georgia Pantalona; Anna Barachanou; Nikolaos Loukas; Lazaros Apostolidis; Filareti Tsalakanidou; Symeon Papadopoulos
Source: check_circle
Crossref

Improving Synthetically Generated Image Detection in Cross-Concept Settings

2023-06-12 | Conference paper
Contributors: Pantelis Dogoulis; Giorgos Kordopatis-Zilos; Ioannis Kompatsiaris; Symeon Papadopoulos
Source: check_circle
Crossref

MAAM: Media Asset Annotation and Management

2023-06-12 | Conference paper
Contributors: Manos Schinas; Panagiotis Galopoulos; Symeon Papadopoulos
Source: check_circle
Crossref

MAD ’23 Workshop: Multimedia AI against Disinformation

2023-06-12 | Conference paper
Contributors: Luca Cuccovillo; Bogdan Ionescu; Giorgos Kordopatis-Zilos; Symeon Papadopoulos; Adrian Popescu
Source: check_circle
Crossref

MemeFier: Dual-stage Modality Fusion for Image Meme Classification

2023-06-12 | Conference paper
Contributors: Christos Koutlis; Manos Schinas; Symeon Papadopoulos
Source: check_circle
Crossref

Synthetic Misinformers: Generating and Combating Multimodal Misinformation

2023-06-12 | Conference paper
Contributors: Stefanos-Iordanis Papadopoulos; Christos Koutlis; Symeon Papadopoulos; Panagiotis Petrantonakis
Source: check_circle
Crossref

Verification of News Video Content: Findings from a Study of Journalism Students

Journalism Practice
2023-05-28 | Journal article
Contributors: Dimitrios Giomelakis; Olga Papadopoulou; Symeon Papadopoulos; Andreas Veglis
Source: check_circle
Crossref

p2pGNN: A Decentralized Graph Neural Network for Node Classification in Peer-to-Peer Networks

IEEE Access
2022 | Journal article
Contributors: Emmanouil Krasanakis; Symeon Papadopoulos; Ioannis Kompatsiaris
Source: check_circle
Crossref

COVID-Related Misinformation Migration to BitChute and Odysee

Future Internet
2022-11-23 | Journal article
Contributors: Olga Papadopoulou; Evangelia Kartsounidou; Symeon Papadopoulos
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

DnS: Distill-and-Select for Efficient and Accurate Video Indexing and Retrieval

International Journal of Computer Vision
2022-10 | Journal article
Contributors: Giorgos Kordopatis-Zilos; Christos Tzelepis; Symeon Papadopoulos; Ioannis Kompatsiaris; Ioannis Patras
Source: check_circle
Crossref

MeVer NetworkX: Network Analysis and Visualization for Tracing Disinformation

Future Internet
2022-05-10 | Journal article
Contributors: Olga Papadopoulou ; Themistoklis Makedas ; Lazaros Apostolidis ; Francesco Poldi ; Symeon Papadopoulos; Ioannis Kompatsiaris 
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Helios.TALK: A decentralised messaging framework that preserves the privacy of users

Open Research Europe
2022-03-04 | Journal article
Contributors: Ioannis Sarridis; Vasiliki Gkatziaki; Emmanouil Krasanakis; Nikos Giatsoglou; Nikos Sarris; Symeon Papadopoulos; Ioannis Kompatsiaris
Source: check_circle
Crossref

The AI4Media Project: Use of Next-Generation Artificial Intelligence Technologies for Media Sector Applications

2021 | Book chapter
Contributors: Filareti Tsalakanidou; Symeon Papadopoulos; Vasileios Mezaris; Ioannis Kompatsiaris; Birgit Gray; Danae Tsabouraki; Maritini Kalogerini; Fulvio Negro; Maurizio Montagnuolo; Jesse de Vos et al.
Source: check_circle
Crossref

Future directions for chatbot research: an interdisciplinary research agenda

Computing
2021-12-19 | Journal article
Contributors: Asbjørn Følstad; Theo Araujo; Effie Lai-Chong Law; Petter Bae Brandtzaeg; Symeon Papadopoulos; Lea Reis; Marcos Baez; Guy Laban; Patrick McAllister; Carolin Ischen et al.
Source: check_circle
Crossref

GAP: Geometric Aggregation of Popularity Metrics

Information
2020-06-15 | Journal article
Contributors: Christos Koutlis; Manos Schinas; Symeon Papadopoulos; Ioannis Kompatsiaris
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Bias in data‐driven artificial intelligence systems—An introductory survey

WIREs Data Mining and Knowledge Discovery
2020-05 | Journal article
Contributors: Eirini Ntoutsi; Pavlos Fafalios; Ujwal Gadiraju; Vasileios Iosifidis; Wolfgang Nejdl; Maria‐Esther Vidal; Salvatore Ruggieri; Franco Turini; Symeon Papadopoulos; Emmanouil Krasanakis et al.
Source: check_circle
Crossref

A corpus of debunked and verified user-generated videos

Online Information Review
2019 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

Detecting tampered videos with multimedia forensics and deep learning

International Conference on Multimedia Modeling
2019 | Conference paper
Source: Self-asserted source
Symeon Papadopoulos

FIVR: Fine-grained Incident Video Retrieval

IEEE Transactions on Multimedia
2019 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

FIVR: Fine-Grained Incident Video Retrieval

IEEE Transactions on Multimedia
2019-10 | Journal article
Contributors: Giorgos Kordopatis-Zilos; Symeon Papadopoulos; Ioannis Patras; Ioannis Kompatsiaris
Source: check_circle
Crossref

Adaptive sensitive reweighting to mitigate bias in fairness-aware classification

Proceedings of the 2018 World Wide Web Conference on World Wide Web
2018 | Conference paper
Source: Self-asserted source
Symeon Papadopoulos

Analysis of Suspended Terrorism-Related Content on Social Media

Community-Oriented Policing and Technological Innovations
2018 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

Building and evaluating resources for sentiment analysis in the Greek language

Language Resources and Evaluation
2018 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

Content-aware detection of JPEG grid inconsistencies for intuitive image forensics

Journal of Visual Communication and Image Representation
2018 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

Detection and visualization of misleading content on Twitter

International Journal of Multimedia Information Retrieval
2018 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

easIE: Easy-to-use information extraction for constructing CSR databases from the web

ACM Transactions on Internet Technology (TOIT)
2018 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

Event Detection and Retrieval on Social Media

arXiv preprint arXiv:1807.03675
2018 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

hackAIR: Towards Raising Awareness about Air Quality in Europe by Developing a Collective Online Platform

ISPRS International Journal of Geo-Information
2018 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

Location Extraction from Social Media: Geoparsing, Location Disambiguation, and Geotagging

ACM Transactions on Information Systems (TOIS)
2018 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

Social computing for verifying social media content in breaking news

IEEE Internet Computing
2018 | Journal article
Source: Self-asserted source
Symeon Papadopoulos

Towards improved air quality monitoring using publicly available sky images

Multimedia Tools and Applications for Environmental & Biodiversity Informatics
2018 | Book chapter
Source: Self-asserted source
Symeon Papadopoulos

Twitter-Based Sensing of City-Level Air Quality

2018 IEEE 13th Image, Video, and Multidimensional Signal Processing Workshop (IVMSP)
2018 | Conference paper
Source: Self-asserted source
Symeon Papadopoulos
Items per page:
Page 1 of 5

Peer review (4 reviews for 4 publications/grants)

Review activity for EURASIP journal on information security. (1)
Review activity for International journal of computer vision. (1)
Review activity for Multimedia systems. (1)
Review activity for Social network analysis and mining. (1)