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Proceedings Paper

A compact shape-measurement module based on a thin compound-eye camera with multiwavelength diffractive pattern projection for intraoral diagnosis
Author(s): K. Kagawa; H. Tanabe; C. Ogata; R. Horisaki; Y. Ogura; Y. Nakao; T. Toyoda; Y. Masaki; M. Ueda; J. Tanida
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Paper Abstract

We have proposed a compact three-dimensional shape-measurement system for intraoral diagnosis, in which multiwavelength pattern projectors based on diffractive optical elements (DOEs) are integrated in the lens gaps of a compound-eye camera. We have built a prototype module with blue and green pattern projectors in both sides of the compound-eye camera to increase in-plane spatial resolution. With the two projectors, the stripe pitch was reduced to 0.73 mm in average from about 1.4 mm for one wavelength. Root-mean-square (rms) error of the measured depth map of a plane board was 0.27 mm at the distance of 40 mm. The rms errors for the measured results of the gums and teeth of a plaster figure and an examinee were 0.37 and 0.40 mm, respectively.

Paper Details

Date Published: 1 September 2009
PDF: 8 pages
Proc. SPIE 7442, Optics and Photonics for Information Processing III, 74420U (1 September 2009); doi: 10.1117/12.827250
Show Author Affiliations
K. Kagawa, Osaka Univ. (Japan)
H. Tanabe, Osaka Univ. (Japan)
C. Ogata, Osaka Dental Univ. (Japan)
R. Horisaki, Osaka Univ. (Japan)
Y. Ogura, Osaka Univ. (Japan)
Y. Nakao, Funai Electric Co., Ltd. (Japan)
T. Toyoda, Funai Electric Co., Ltd. (Japan)
Y. Masaki, Funai Electric Co., Ltd. (Japan)
M. Ueda, Osaka Dental Univ. (Japan)
J. Tanida, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 7442:
Optics and Photonics for Information Processing III
Khan M. Iftekharuddin; Abdul Ahad Sami Awwal, Editor(s)

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