Medical & Biological Engineering & Computing

, Volume 48, Issue 1, pp 39–47

Capacitive facial movement detection for human–computer interaction to click by frowning and lifting eyebrows

Assistive technology
  • Ville Rantanen
  • Pekka-Henrik Niemenlehto
  • Jarmo Verho
  • Jukka Lekkala
Article

DOI: 10.1007/s11517-009-0565-6

Cite this article as:
Rantanen, V., Niemenlehto, PH., Verho, J. et al. Med Biol Eng Comput (2010) 48: 39. doi:10.1007/s11517-009-0565-6

Abstract

A capacitive facial movement detection method designed for human–computer interaction is presented. Some point-and-click interfaces use facial electromyography for clicking. The presented method provides a contactless alternative. Electrodes with no galvanic coupling to the face are used to form electric fields. Changes in the electric fields due to facial movements are detected by measuring capacitances between the electrodes. A prototype device for measuring a capacitance signal affected by frowning and lifting eyebrows was constructed. A commercial integrated circuit for capacitive touch sensors is used in the measurement. The applied movement detection algorithm uses an adaptive approach to provide operation capability in noisy and dynamic environments. Experimentation with 10 test subjects proved that, under controlled circumstances, the movements are detected with good efficiency, but characterizing the movements into frowns and eyebrow lifts is more problematic. Integration with a two-dimensional (2D) pointing solution and further experiments are still required.

Keywords

Assistive device Capacitive detection Electric field sensing Facial movement Human–computer interaction 

Copyright information

© International Federation for Medical and Biological Engineering 2009

Authors and Affiliations

  • Ville Rantanen
    • 1
  • Pekka-Henrik Niemenlehto
    • 2
  • Jarmo Verho
    • 1
  • Jukka Lekkala
    • 1
  1. 1.Department of Automation Science and EngineeringTampere University of TechnologyTampereFinland
  2. 2.Department of Computer SciencesUniversity of TampereTampereFinland

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