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Proceedings Paper

Novel rangefinding system using a correlation image sensor
Author(s): Akira Kimachi; Toru Kurihara; Masao Takamoto; Shigeru Ando
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Paper Abstract

This paper proposes a 3D measurement principle for the correlation image sensor (CIS), which generates temporal correlation between light intensity and an external reference signal at each pixel. Another key of our system besides the CIS is amplitude-modulation of the scanning sheet beam, the phase of which relative to a reference signal is varied according to the scanning angle. After a scan within a frame, the phase is demodulated with a quadrature pair of reference signals and output by the CIS to compute the individual angle of the sheet bam at each pixel. By virtue of lock-in detection principle, the effects of background illumination and/or surface reflectance nonuniformity of the object are thoroughly removed. We implemented this system using our CMOS 64 by 64 pixel CIS, and successfully reconstructed a depth map under its frame rate.

Paper Details

Date Published: 22 December 2000
PDF: 8 pages
Proc. SPIE 4309, Videometrics and Optical Methods for 3D Shape Measurement, (22 December 2000); doi: 10.1117/12.410881
Show Author Affiliations
Akira Kimachi, Univ. of Tokyo (Japan)
Toru Kurihara, Univ. of Tokyo (Japan)
Masao Takamoto, Univ. of Tokyo (Japan)
Shigeru Ando, Univ. of Tokyo (Japan)


Published in SPIE Proceedings Vol. 4309:
Videometrics and Optical Methods for 3D Shape Measurement
Sabry F. El-Hakim; Armin Gruen, Editor(s)

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