Areas of interest

• Digital Image Processing
• Pattern Recognition
• Document Image Analysis
• Optical Character Recognition with emphasis on handwriting

CV data

Vassilis Papavassiliou received the Diploma degree in the Electrical and Computer Engineering from the National Technical University of Athens (NTUA), Greece, in 1998. The title of his thesis was “Development of a Speech Recognition System for Educational Software”. The results of this thesis were incorporated in the “Filoglossia” educational multimedia product. He also holds a M.Sc. degree in Language Technology graduating from NTUA & National & Kapodistrian University of Athens in 2000. The subject of his M.Sc. thesis focused on a statistical approach of the literary style with applications to author identification. In 2010, he obtained his Ph.D. degree at NTUA on handwritten document image analysis under the supervision of Professor Carayannis. During pursing his Ph.D., he participated in teaching of the “Digital Signal Processing” course at the School of Electrical and Computer Engineering - N.T.U.A.
He has been associated with the Institute for Language and Speech Processing (ILSP / R.C. "Athena") since 1998. He has worked on several educational multimedia projects as a software engineer. The more recent ones are "A knight in the castle of letters", “ECDL Tests” (7CD-ROMs), «ECDL-Advanced Tests» (4 CD-ROMs), “Trilingual Term Dictionary” and “Nea Logomatheia”. He has also participated, as a research assistant, in the research projects “Panoptis” (a system for detection of artificial text in videos), “SAMS” (an optical handwritten recognition system of mathematical symbols) and “PENED 2003 – Applications of Pattern Recognition on Language technology”. Currently he focuses on applied research in computational linguistics and development of two systems for acquiring monolingual and bilingual data from the web in the context of the research project "PANACEA".
His research interests involve digital image processing with emphasis on document image analysis and machine learning and pattern recognition with applications to handwritten character recognition. The results of his basic and applied research are incorporated in commercial products or laboratory prototypes.
He is a member of the National Technical Chamber of Greece (TEE) since 1998.

Awards

• Winners of the ICDAR2009 Handwriting Segmentation Contest, 26-29 July 2009, Barcelona, Spain. Team members: V. Papavassiliou, T. Stafylakis, V. Katsouros, G. Carayannis.
• Winners of the ICDAR2007 Handwriting Segmentation Contest, 23-26 September 2007, Curitiba, Brazil. Team members: V. Papavassiliou, T. Stafylakis, V. Katsouros, G. Carayannis.
   

• Papavassiliou, V., Sofianopoulos, S., Prokopidis, P. & Piperidis, S. (2018). The ILSP/ARC submission to the WMT 2018 Parallel Corpus Filtering Shared Task. In Proceedings of the Third Conference on Machine Translation: Shared Task Papers, pages 928-933. Belgium, Brussels : Association for Computational Linguistics. [...] 
• Papavassiliou, V., Prokopidis, P. & Piperidis, S. (2018). Discovering Parallel Language Resources for Training MT Engines. In Proceedings of the Eleventh International Conference on Language Resources and Evaluation (LREC 2018). European Language Resources Association (ELRA). [...] 
• Antonio Toral, Miquel Esplá-Gomis, Filip Klubička, Nikola Ljubešić, Papavassiliou, V., Prokopidis, P. et al. (2017). Crawl and crowd to bring machine translation to under-resourced languages. Language Resources and Evaluation, 1–33. [...] 
• Katsouros, V., Papavassiliou, V., Simistira, F. & Basilis Gatos. (2016). Recognition of Greek Polytonic on Historical Degraded Texts Using HMMs. In, pages 346-351. [...] 
• Papavassiliou, V., Prokopidis, P. & Piperidis, S. (2016). The ILSP/ARC submission to the WMT 2016 Bilingual Document Alignment Shared Task. In Proceedings of the First Conference on Machine Translation, pages 733-739. Berlin, Germany : Association for Computational Linguistics. [...] 
• Prokopidis, P., Papavassiliou, V. & Piperidis, S. (2016). Parallel Global Voices: a Collection of Multilingual Corpora with Citizen Media Stories. In Nicoletta Calzolari (Conference Chair) , Khalid Choukri , Thierry Declerck , Marko Grobelnik , Bente Maegaard , Joseph Mariani et al (editors), Proceedings of the Tenth International Conference on Language Resources and Evaluation (LREC 2016). European Language Resources Association (ELRA). [...] 
• Simistira, F., Adnan Ul-Hassan, Papavassiliou, V., Basilis Gatos, Katsouros, V. & Marcus Liwicki. (2015). Recognition of historical Greek polytonic scripts using LSTM networks. In, pages 766-770. [...] 
• Basilis Gatos, Nikos Stamatopoulos, Giorgos Sfikas, George Rekatsinas, Papavassiliou, V., Simistira, F. et al. (2015). GRPOLY-DB: An old Greek polytonic document image database.. In, pages 646-650. [...] 
• Raphael Rubino, Tommi Pirinen, Miquel Esplà-Gomis, Nikola Ljubešić, Sergio Ortiz Rojas, Papavassiliou, V. et al. (2015). Abu-MaTran at WMT 2015 Translation Task: Morphological Segmentation and Web Crawling. In Proceedings of the Tenth Workshop on Statistical Machine Translation, pages 184–191. Lisbon, Portugal : Association for Computational Linguistics. [...] 
• Pecina, P., Toral, A., Papavassiliou, V., Prokopidis, P., Tamchyna, A., Way, A. et al. (2015). Domain adaptation of statistical machine translation with domain-focused web crawling. Language Resources and Evaluation, 49(11), 147-193. [...] 
• Antonio Toral, Tommi Pirinen, Andy Way, Raphaël Rubino, Gema Ramírez-Sánchez, Sergio Ortiz-Rojas et al. (2015). Automatic Acquisition of Machine Translation Resources in the Abu-MaTran Project. Procesamiento del Lenguaje Natural, 55, 185-188. [...] 
• Maria S Mouroutsou, Markantonatou, S. & Papavassiliou, V. (2014). The development of vocabularies of historical period names from web acquired corpora7. Mediterranean Archaeology & Archaeometry, 14(4). [...] 
• Simistira, F., Papavassiliou, V., Katsouros, V. & Carayannis, G. (2014). Recognition of Spatial Relations in Mathematical Formulas. In, pages 164-168. [...] 
• Miquel Esplà-Gomis, Filip Klubička, Nikola Ljubešić, Sergio Ortiz-Rojas, Papavassiliou, V. & Prokopidis, P. (2014). Comparing Two Acquisition Systems for Automatically Building an English-Croatian Parallel Corpus from Multilingual Websites. In Proceedings of the Ninth International Conference on Language Resources and Evaluation. Reykjavik, Iceland. [...] 
• Μουρούτσου, Μ., Markantonatou, S. & Papavassiliou, V. (2014). The Development of Thesauri of Historical Period Names from Web Acquired Data. Mediterranean Archaeology and Archaeometry, 14(4), 165-174. [...] 
• Mouroutsou, M. & Papavassiliou, V. (2014). Developing Thesauri of Historical Period Names from Web Acquired Data. In 11th International Conference on Greek Linguistics. Rhodes, Greece. [...] 
• Katsouros, V., Papavassiliou, V. & Emmanouilidis, C. (2013). A bayesian approach for maintenance action recommendation. International Journal of Prognostics and Health Management, International Journal of Prognostics and Health Management, 4(2), 034. [...] 
• Katsouros, V., Papavassiliou, V. & Emmanouilidis, C. (2013). A Bayesian Approach for Maintenance Action Recommendation. International Journal of the PHM Society, 4 (2)(034). [...] 
• Papavassiliou, V., Prokopidis, P. & Gregor Thurmair. (2013). A modular open-source focused crawler for mining monolingual and bilingual corpora from the web. In Proceedings of the Sixth Workshop on Building and Using Comparable Corpora, pages 43-51. Sofia, Bulgaria : Association for Computational Linguistics. [...] 
• Simistira, F., Papavassiliou, V., Katsouros, V. & Carayannis, G. (2013). Structural analysis of online handwritten mathematical symbols based on support vector machines. In Document Recognition and Retrieval XX. San Francisco, USA. [...] 
• Papavassiliou, V., Simistira, F., Katsouros, V. & Carayannis, G. (2012). A Morphology based Approach for Binarization of Handwritten Documents. In 13th International Conference on Frontiers in Handwriting Recognition, pages 575-579. Bari, Italy. [...] 
• Simistira, F., Papavassiliou, V., Katsouros, V. & Carayannis, G. (2012). A System for Recognition of On-Line Handwritten Mathematical Expressions. In 13th International Conference on Frontiers in Handwriting Recognition, pages 193-198. Bari, Italy. [...] 
• Gkiokas, A., Papavassiliou, V., Katsouros, V. & Carayannis, G. (2012). Deploying Nonlinear Image Filters to Spectrogram for Harmonic/Percussive Separation. In 15th International Conference on Digital Audio Effects. York, UK. [...] 
• Pecina, P., Toral, A., Papavassiliou, V., Prokopidis, P. & Van Genabith, J. (2012). Domain Adaptation of Statistical Machine Translation using Web-Crawled Resources: A Case Study. In Proceedings of the 16th Annual Conference of the European Association for Machine Translation. Trento, Italy. [...] 
• Bel, N., Papavassiliou, V., Prokopidis, P., Toral, A., Victoria Arranz & Arranz, V. (2012). Mining and Exploiting Domain-Specific Corpora in the PANACEA Platform. In The Fifth Workshop on Building and Using Comparable Corpora. Istanbul, Turkey. [...] 
• Mastropavlos, N. & Papavassiliou, V. (2011). Automatic Acquisition of Bilingual Language Resources. In Proceedings of the 10th International Conference of Greek Linguistics, Komotini, Greece, pages 432-440. [...] 
• Pecina, P., Toral, A., Way, A., Prokopidis, P., Papavassiliou, V. & Giagkou, M. (2011). Towards Using Web-Crawled Data for Domain Adaptation in Statistical Machine Translation. In M.L. Forcada, H. Depraetere & V. Vadeghinste (editors), Proceedings of the 15th Annual conference of the European Association for Machine Translation, pages 297-304. Leuven, Belgium. [...] 
• Katsouros, V. & Papavassiliou, V (2011). Segmentation of Handwritten Document Images into Text Lines. Image Segmentation. INTECH OPEN ACCESS PUBLISHER. [...] 
• Papavassiliou, V., Stafylakis, T., Katsouros, V. & Carayannis, G. (2010). Handwritten Document Image Segmentation into Text Lines and Words. Pattern Recognition, 43(1), 369-377. [...] 
• Papavassiliou, V. (2010). Detection and segmentation: Processes of manuscript and multimedia archives for indexing and recognition. Phd Thesis, Εθνικό Μετσόβιο Πολυτεχνείο. [...] 
• Papavassiliou, V., Katsouros, V. & Carayannis, G. (2010). A Morphological Approach for Text-Line Segmentation in Handwritten Documents. In in proceedings of the 12th International Conference on Frontiers in Handwriting Recognition 2010. Kolkata, India : IEEE computer society CPS. [...] 
• Demiros, I., Carayannis, G., Antonopoulos, V., Kambourakis, G., Katsouros, V., Kolevris, P. et al. (2008). PANOPTIS: a System for Intelligent Monitoring of the Hellenic Broadcast Sector. In Proceedings of the 19th International Workshop on Database and Expert Systems Application, 2008. DEXA '08., pages 605 - 609. Turin. [...] 
• Papavassiliou, V., Stafylakis, T., Katsouros, V. & Carayannis, G. (2007). A Parametric Spectral-Based Method for Verification of Text in Videos. In In proceedings of the 9-th International Conference on Document Analysis and Recognition, 2007. ICDAR 2007., pages 879 - 883. Curitiba, Parana, Brazil. [...] 
• Stafylakis, T., Papavassiliou, V., Katsouros, V. & Carayannis, G. (2007). Robust Text-Line and Word Segmentation for Handwritten Document Images. In In proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, 2008. ICASSP 2008., pages 3393 - 3396. Las Vegas, NV. [...] 
• Tzevelekou, M., Vacalopoulou, A., Kantzou, V., Papavassiliou, V., Papageorgakopoulos, J. & Stamouli, S. (2006). Software for learning Greek as an L2 [in Greek]. In Proceedings of the Conference “Intercultural Education and Teaching of Greek as L2, pages 117-133. Λευκωσία : Cyprus Institute of Education. [...] 
• Tzevelekou, M., Vacalopoulou, A., Papageorgakopoulos, J. & Papavassiliou, V. (2002). Το λεξιλόγιο του δίγλωσσου ομιλητή: η συγκρότηση ενός ελληνοτουρκικού παιδικού λεξικού πολυμέσων. In Ομοιότητες και διαφορές: Αναζητώντας νέους δρόμους στην εκπαίδευση, pages 36-45. Αθήνα : ΕΚΠΑ. [...] 
• Papavassiliou, V. & Pasxalis, S. (2000). Literary Style Recognition. Master Thesis, National and Kapodistrian University of Athens - National Technical University. [...]