• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1996 Fiscal Year Final Research Report Summary

Non-contact motion measurement of mastication by integration of multiple sensors

Research Project

Project/Area Number 07838001
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section時限
Research Field 咀嚼
Research InstitutionHokkaido University

Principal Investigator

KAWASHIMA Toshio  Hokkaido Univ., Fac.of Eng., Assoc.Prof., 工学部, 助教授 (20152952)

Co-Investigator(Kenkyū-buntansha) KAWASAKI Takao  Hokkaido Univ., Sch.of Dent., Prof., 歯学部, 教授 (90002229)
AOKI Yoshinao  Hokkaido Univ., Fac.of Eng., Prof., 工学部, 教授 (90001180)
Project Period (FY) 1995 – 1996
Keywordsmastication / sensor integration
Research Abstract

Motion measurement of lower jaw is important for clinical diagnosis of jaw function. Three dimensional measurement of lower jaw movement is especially important in order to diagnose mastication function which reflects jaw joint status ; these jaw joints are usually unseen from appearance. An altenative of the jaw motion measurement is the measurement of facial motion around lips. The motion obviously reflects mastication-related motion. In the research, we developed a stereo vision facial motion measurement system, and an integration algroithm of multiple sensors in order to diagnose dental disorder from appearance.
1) Integration of multiple sensor data
An integration algorithm has proposed to integrate range-sensor data and stereo vision data. The algorithm is based on Baysian estimation and Kalman filter.
2) System for multi-point movement measurement of lips and adjacent region
A multi-point measurement system has developed. In the system, the 3D coordinates of 15 markers stuck to the skin around lips are tracked by a stereo vision. With the system, we analyzed the relationships beween lower-face motion and disorders of jaws, muscles, and occlusion. The method decomposes the time-series data into principal components. Generally, lower-face motion can be precisely described with two or three components.
3) The design of realtime measurement system
We renewed the image capturing system which we developed in the first year. The new lip-motion measurement system can record 10 second image sequences, and analyze the data points in realtime. In the beginning of the research, we planned to use a DSP chip, however, we were able to construct a system without DSP because of the progress of CPU technology.

  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] 瀬高、坂口、川崎、長崎、川嶋、青木: "咀嚼時口唇付近の動きに関する多点時系より解析 第2報顔面皮膚の部位別動態に関する検討" 北海道歯学雑誌. 17. 72-80 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Setaka, Sakaguchi, Kawasaki, Nagasaki, Kawashima, Aoki: "Time-series analysis of multi-point movements of lips and adjacent regions during mastication" Hokkaido J.Dent.Sci.17. 72-80 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 1999-03-09  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi