Abstract
The lip-shape recognition of Japanese vowels utilizing a stereoscopic vision system has been performed to enhance the discrimination of five vowels by machine lip-reading. The opening angle P 4 between the upper lip and the lower lip is selected as the typical three-dimensional feature parameter of lip shape, in addition to the usual feature parameters such as the width P 1 and the height P 2 of the lip shape and distance P 3 between the tips of the upper lip and the chin. Compared with the 3 two-dimensional parameters P 1 , P 2 and P 3 used in a single-vision system, the 3 and 4 three-dimensional parameters led to the significant increase of discrimination rate, and in particular, the discrimination rate by the 4 three-dimensional parameters was more than 90% for every tested subject. Recognition for an unspecified subject was also examined, based on the selections of the variance-covariance matrix and the mean vector of feature variables, by which the Mahalanobis' generalized square distance and the maximum likelihood discrimination function were determined.
| Original language | English |
|---|---|
| Pages (from-to) | 525-530 |
| Number of pages | 6 |
| Journal | transactions of the japan society of mechanical engineers series c |
| Volume | 60 |
| Issue number | 570 |
| DOIs | |
| Publication status | Published - 1994 Jan 1 |
| Externally published | Yes |
Keywords
- Human Engineering
- Lip Reading
- Lip Shapes
- Man-Machine Interface
- Stereoscopic Vision
- Three-Dimensional Measurement
- Vowel Recognition
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering