A Formal Language to Describe and Animate Signs in Brazilian Sign Language


  • Danilo Assis Nobre dos S. Silva Federal University of Paraíba
  • Tiago Maritan Ugulino de Araújo Federal University of Paraíba
  • Leonardo Dantas Federal University of Paraíba
  • Vandhuy F. Martins Federal University of Paraíba
  • Yúrika Sato Nóbrega Federal University of Paraíba
  • Hozana Raquel Gomes de Lima Federal University of Paraíba
  • Guido Lemos de Souza Filho Federal University of Paraíba




In this paper, we propose the definition of a formal, expressive and consistent language to describe signs in Brazilian Sign Language (LIBRAS). This language allows the definition of all parameters (phonemes) of a sign and from this definition an animation is generated based on a 3D humanoid avatar. The proposed language is also flexible in the sense that it has mechanisms to include new parameters (or phonemes) “on the fly”. In order to provide a case study for the proposed language, a human computation system for collaborative construction of a LIBRAS vocabulary was also developed. This system, called WikiLIBRAS, allows deaf users and LIBRAS interpreters to describe signs and generate animations for signs in LIBRAS. Some preliminary tests with Brazilian deaf users and LIBRAS interpreters were also performed to evaluate the proposal. Our preliminary evaluation indicates that the proposed language can represent a significant number of signs in LIBRAS and WikiLIBRAS users can generate signs in LIBRAS more productively than 3D designers.


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How to Cite

SILVA, D. A. N. dos S.; ARAÚJO, T. M. U. de; DANTAS, L.; MARTINS, V. F.; NÓBREGA, Y. S.; LIMA, H. R. G. de; SOUZA FILHO, G. L. de. A Formal Language to Describe and Animate Signs in Brazilian Sign Language. Journal on Interactive Systems, Porto Alegre, RS, v. 3, n. 2, 2013. DOI: 10.5753/jis.2012.612. Disponível em: https://journals-sol.sbc.org.br/index.php/jis/article/view/612. Acesso em: 19 jun. 2024.



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