sign-lang@LREC Anthology

Greek Sign Language Recognition for the SL-ReDu Learning Platform

Papadimitriou, Katerina | Potamianos, Gerasimos | Sapountzaki, Galini | Goulas, Theodore | Efthimiou, Eleni ORCID button Efthimiou, Eleni | Fotinea, Stavroula-Evita ORCID button Fotinea, Stavroula-Evita | Maragos, Petros

Proceedings of the 7th International Workshop on Sign Language Translation and Avatar Technology: The Junction of the Visual and the Textual: Challenges and Perspectives
Marseille, France
24 June 2022
European Language Resources Association (ELRA)
CC BY-NC 4.0

Content Categories

Greek Sign Language
SL-ReDu Learning Platform


There has been increasing interest lately in developing education tools for sign language (SL) learning that enable self-assessment and objective evaluation of learners' SL productions, assisting both students and their instructors. Crucially, such tools require the automatic recognition of SL videos, while operating in a signer-independent fashion and under realistic recording conditions. Here, we present an early version of a Greek Sign Language (GSL) recognizer that satisfies the above requirements, and integrate it within the SL-ReDu learning platform that constitutes a first in GSL with recognition functionality. We develop the recognition module incorporating state-of-the-art deep-learning based visual detection, feature extraction, and classification, designing it to accommodate a medium-size vocabulary of isolated signs and continuously fingerspelled letter sequences. We train the module on a specifically recorded GSL corpus of multiple signers by a web-cam in non-studio conditions, and conduct both multi-signer and signer-independent recognition experiments, reporting high accuracies. Finally, we let student users evaluate the learning platform during GSL production exercises, reporting very satisfactory objective and subjective assessments based on recognition performance and collected questionnaires, respectively.

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  author    = {Papadimitriou, Katerina and Potamianos, Gerasimos and Sapountzaki, Galini and Goulas, Theodore and Efthimiou, Eleni and Fotinea, Stavroula-Evita and Maragos, Petros},
  title     = {{Greek} {Sign} {Language} Recognition for the {SL-ReDu} Learning Platform},
  pages     = {79--84},
  editor    = {Efthimiou, Eleni and Fotinea, Stavroula-Evita and Hanke, Thomas and McDonald, John C. and Shterionov, Dimitar and Wolfe, Rosalee},
  booktitle = {Proceedings of the 7th International Workshop on Sign Language Translation and Avatar Technology: The Junction of the Visual and the Textual: Challenges and Perspectives},
  maintitle = {13th International Conference on Language Resources and Evaluation ({LREC} 2022)},
  publisher = {{European Language Resources Association (ELRA)}},
  address   = {Marseille, France},
  day       = {24},
  month     = jun,
  year      = {2022},
  isbn      = {979-10-95546-82-5},
  language  = {english},
  url       = {}
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