Analysis of lip motion using principal component analyses

Katsuaki Mishima, Tomohiro Yamada, Tatsushi Matsumura, Norifumi Moritani

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Objectives: The aim of this study was to quantitatively determine lip movement characteristics during the phonation of Japanese vowels. Materials and methods: Lip motions of 14 normal individuals during the phonation of five Japanese vowels, /a/, /i/, /u/, /e/, and /o/ were analyzed. Using our developed motion analyzing system, range images were produced across the whole sequence during lip motions, and virtual grids were fitted onto surfaces. Principal component analyses were applied with three-dimensional coordinates of intersections for virtual grids regarded as variables. Results and conclusion: The fourth and fifth principal component scores were shown to be parameters that control mouth opening and the retraction of the corners of the mouth, respectively. Discriminate analyses show it is possible to distinguish motion during the phonation of /u/ from that of other vowels.

Original languageEnglish
Pages (from-to)232-236
Number of pages5
JournalJournal of Cranio-Maxillofacial Surgery
Issue number4
Publication statusPublished - Jun 2011


  • Cleft lip and palate
  • Lip motion
  • Motion analysis
  • Principal component analysis
  • Range image

ASJC Scopus subject areas

  • Surgery
  • Oral Surgery
  • Otorhinolaryngology


Dive into the research topics of 'Analysis of lip motion using principal component analyses'. Together they form a unique fingerprint.

Cite this