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[Observation of oral actions using digital image processing system].

T Ichikawa1, J Komoda, M Horiuchi

  • 1Department of Removable Prosthodontics, School of Dentistry, The University of Tokushima.

Nihon Hotetsu Shika Gakkai Zasshi
|April 1, 1990
PubMed
Summary

A novel digital image processing system analyzes lip movements during speech. This system clearly classified lip positions for vowels and identified specific lip movements for certain consonants, aiding speech articulation research.

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Area of Science:

  • Speech Science
  • Biomedical Engineering
  • Digital Image Processing

Background:

  • Understanding oral articulation is crucial for speech analysis and prosthetic development.
  • Existing methods for analyzing speech movements may lack precision or comprehensive data capture.

Purpose of the Study:

  • To introduce a new digital image processing system for observing and analyzing oral actions.
  • To investigate lip movements during the articulation of vowels and consonants using this system.

Main Methods:

  • A digital image processing system comprising a VTR, digital image processor, percept scope, CCD camera, A/D converter, and PC was developed.
  • Five reference points were placed on the lips and eyeglasses of 9 adult subjects.
  • Lip movements were recorded and analyzed during the utterance of five vowels and consonants [k, s, t, h, r, m, p, b].

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Main Results:

  • The system successfully classified lip positions during vowel utterances.
  • Minimal active lip movement was observed for consonants [k, s, t, h, r], suggesting dependence on tongue and mandibular actions.
  • Specific lip movements, including upper lip retraction and lower lip protrusion, were noted for consonants [m, p, b].

Conclusions:

  • The developed digital image processing system is effective for analyzing lip kinematics during speech.
  • Lip movement patterns differ significantly between vowels and consonants, with consonants like [m, p, b] exhibiting distinct lip articulations.
  • Findings contribute to a better understanding of speech articulation mechanisms.