Symeon Papadopoulos

social media mediaeval verification twitter multimedia image forensics multimedia retrieval social event detection community detection clustering online disinformation multimedia verification image tampering benchmarking geotagging deepfakes deep learning fake news events flickr social networks gans media verification deepfake detection generative adversarial networks convolutional neural networks video search video retrieval machine learning hoax debunking privacy multimedia forensics journalism evaluation language models near-duplicate detection indexing social news social multimedia topic discovery topic detection sentiment analysis dataset semi-supervised learning synthetic media weverify ai4media cybersecurity face swap faceswap video forensics content authentication forgery detection splicing detection media forensics manipulation contact tracing covid-19 infodemic misinformation predictive modeling feature extraction hackair air quality estimation opportunistic sensing social sensing rumour cascades media literacy photoshopping detection image authentication fact checking vggnet alexnet googlenet mediaeval2016 acmmm16 inferences multimedia privacy acmmm2016 data protection placing task mmcommons yfcc100m user profiling information disclosure personal information user study social science user-generated content icwsm2016 smnews splicing news prediction comment mining popularity prediction controversiality popularity diverse image retrieval location detection splice detection user classification query formulation relevance classification multimedia search revealproject ner social media mining ensemble learning polarity classification neo4j titan orientdb graph databases analytics mining mongo solr trending topic detection snow2014 www2014 data challenge hurricane sandy supervised learning lda summarization topic modeling event indexing multimodal clustering graph-based clustering classification sed supervised clustering event discovery online communities news discovery online social networks film festival event mining image indexing visual words cbir image retrieval mobile mmsys tiff53 thessfest tedxthess tdf14 apps mir-flickr multimedia fusion concept detection multimedia annotation online learning sed2012 icmr2012 εξόρυξη γνώσης κοινωνικά δίκτυα διατριβή web applications jdbc geo text indexing landmarks tagging photo collections dawak folksonomy tag clustering mediaeval2011 sed2011 event detection tagged photos collective intelligence project results weknowit graphs flickr photos clusttour city exploration