Design of a Brazilian Portuguese Virtual Keyboard for People with Severe Motor Disability

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Virtual keyboards represent an important tool in the Assistive Technology area as they can assist in computer interaction by people with severe motor disability. Depending on the interaction method used, a differentiated arrangement of keys can speed up the task of typing a text. This work proposes a virtual keyboard layout which allows people with disabilities to write texts in Brazilian Portuguese language efficiently. The method of human-computer interaction used is a webcam-based cursor controller limited by continuum vertical and horizontal movements. Keys arrangement is based on digraphs frequency of occurrence in a corpus of Portuguese language. The performance of the virtual keyboard was evaluated by two tests. Firstly, a function which estimates the movement efficiency when typing a key is used to compare the layout with other solutions. Proposed layout presented typing speed faster than QWERTY (41%), OPTI (4%) and FITALY (3%). In user evaluation, users have performed the tasks significantly faster with the proposed keyboard layout.


  • Pamela Campos Levy
  • Nirvana da Silva Antônio
  • Rogério Caetano
  • Priscila Gomes Souza


  • IHC 2014 – XIII Simpósio Brasileiro Sobre Fatores Humanos em Sistemas Computacionais
  • Data e Local: 27 a 31 de outubro de 2014 – Foz do Iguaçu/PR

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