| Co-Investigator(Kenkyū-buntansha) |
HIROSE Syozo Osaka Gas Information System Research Institute, Division of e-business, Researcher, eビジネス事業部, 研究員
YAMADA Tomohiro Okayama University, Graduate School of Medicine and Dentistry, Assistant Professor, 大学院・医歯学総合研究科, 助手 (60335619)
SUGAHARA Toshio Okayama University, Graduate School of Medicine and Dentistry, Professor, 大学院・医歯学総合研究科, 教授 (10116048)
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| Research Abstract |
To establish a diagnostic method of cleft palate speech, we study on analyzing method of lip movement and chaos analyzing of speech.
1. Analyzing method of lip movement
A motion of the face was captured using 3 IR cameras, one color camera, a projector of infrared pattern, 4 digital video decks and a synchronizer. We succeeded in production of range images for a face by applying the algorithm of ~a multiple-baseline stereo. Accuracy of the range image was investigated using an actuator with high accuracy and a known object. Consequently, the differences between the distances calculated from the range images and the known values were ranging from 0.53-0.73mm and 0.14-0.44mm in longitudinal and lateral directions, respectively. It was considered that the accuracy of the range images was enough in clinical usage. Subsequently, we developed the following programs to analyze a lip motion : 1) the lip was divided into several areas, 2) uv coordinate system was applied, and 3) the speed and eigenvalue were calculated. Now lip motion in articulation is analyzed.
2. Chaos analysis of speech
Using sentences of "ki-tsu-tsu-ki-tsu-tsu-ku" and "u-e-o-o-o-u", Lyapunov exponents were calculated. Simultaneously, nasalance was recorded. The subjects were 16 healthy adults and 9 cleft palate patients, including the two patients who displayed obvious velopharyngeal incompetence (VPI). As a result, the following findings were indicated : 1) nasalance scores in the healthy group were very sparse, 2) there was no correlation between nasalance scores and Lyapunov exponents, 3) both nasalance scores and Lyapunov exponents were high in the patients with VPI. This indicated the possibility to raise the precision of diagnosis for velopharyngeal closing function.
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