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Proceedings Paper

Simultaneous 3D position sensing by means of large scale spherical aberration of lens and Hough transform technique
Author(s): Yasuji Seko; Yasuyuki Saguchi; Yoshinori Yamaguchi; Hiroyuki Hotta; Kazumasa Murai; Jun Miyazaki; Hiroyasu Koshimizu
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Paper Abstract

We demonstrate a real time 3D position sensing of multiple light sources by capturing their ring images that are transformed by the molecular lens system with large spherical aberration. The ring images change in diameter in accordance with the distance to the light sources, and the ring center positions determine the directions toward them. Therefore, the 3D positions of light sources are calculated by detecting the diameters and center positions of the circles. This time we succeeded to measure 3D positions of multiple light sources simultaneously in real time by extracting and tracking the circle patterns individually. Each circle is extracted by the Hough transform technique that uses not-closely-distributing three edge points to search the primal votes more than threshold, and is tracked by predicting the successive positions by Kalman filter. These processes make it possible to measure the 3D positions of light sources even in the case of overlapped plural circles. In the experiment, we could track several circle patterns measuring the center positions and diameters, namely, measuring the 3D positions of LEDs in real space. Measurement error of 3D positions for a LED was 6.8mm in average for 150 sampling points ranging from 450mm to 950mm in distance.

Paper Details

Date Published: 6 December 2005
PDF: 8 pages
Proc. SPIE 6049, Optomechatronic Sensors and Instrumentation, 60490H (6 December 2005); doi: 10.1117/12.648656
Show Author Affiliations
Yasuji Seko, Fuji Xerox Co., Ltd. (Japan)
Yasuyuki Saguchi, Fuji Xerox Co., Ltd. (Japan)
Yoshinori Yamaguchi, Fuji Xerox Co., Ltd. (Japan)
Hiroyuki Hotta, Fuji Xerox Co., Ltd. (Japan)
Kazumasa Murai, Fuji Xerox Co., Ltd. (Japan)
Jun Miyazaki, Fuji Xerox Co., Ltd. (Japan)
Hiroyasu Koshimizu, Chukyo Univ. (Japan)

Published in SPIE Proceedings Vol. 6049:
Optomechatronic Sensors and Instrumentation
Yasuhiro Takaya, Editor(s)

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