A compact shape-measurement module based on a thin compound-eye camera with multiwavelength diffractive pattern projection for intraoral diagnosis

K. Kagawa; H. Tanabe; C. Ogata; R. Horisaki; Y. Ogura; Y. Nakao; T. Toyoda; Y. Masaki; M. Ueda; J. Tanida

doi:10.1117/12.827250

1 September 2009 A compact shape-measurement module based on a thin compound-eye camera with multiwavelength diffractive pattern projection for intraoral diagnosis

K. Kagawa, H. Tanabe, C. Ogata, R. Horisaki, Y. Ogura, Y. Nakao, T. Toyoda, Y. Masaki, M. Ueda, J. Tanida

Author Affiliations +

Proceedings Volume 7442, Optics and Photonics for Information Processing III; 74420U (2009) https://doi.org/10.1117/12.827250
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

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.

Citation Download Citation

K. Kagawa, H. Tanabe, C. Ogata, R. Horisaki, Y. Ogura, Y. Nakao, T. Toyoda, Y. Masaki, M. Ueda, and J. Tanida "A compact shape-measurement module based on a thin compound-eye camera with multiwavelength diffractive pattern projection for intraoral diagnosis", Proc. SPIE 7442, Optics and Photonics for Information Processing III, 74420U (1 September 2009); https://doi.org/10.1117/12.827250

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