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Proceedings Paper

High-precision on-machine 3D shape measurement using hypersurface calibration method
Author(s): Taeho Ha; Yasuhiro Takaya; Takashi Miyoshi; Shingo Ishizuka; Tatsuhiko Suzuki
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Paper Abstract

We present a high-precision fringe pattern projection technique based on a novel 4D hypersurface calibration method, and its application to on-machine measurement of raw-stocks in die-making industry. Our fringe pattern projection technique has the following feature. In the calibration stage, coordinates (x, y) of a CCD image sensor correspond uniquely, for every calibration plane with height Zi (i=1,..,n), to a phase φ of a projected fringe pattern, and coordinates (X , Y) of a machine tool. These relationships are converted to hypersurfaces in 4D spaces of (x, y, Z, φ), (x, y, Z, X), and (x, y, Z, Y), which are considered to be a sort of function. Using these hypersurfaces, a measured data of (x, y, φ) is transformed to machine tool coordinates (X, Y, Z). Our hypersurface calibration method is expected to minimize systematic errors, because it inputs an observed data (x, y, φ) into precise interpolation functions created using actual measurement data, and accordingly systematic errors are cancelled. The repeatability, systematic errors, and random errors obtained from the experiment show that our measurement system has a potential for highly accurate non-contact 3D shape measurement.

Paper Details

Date Published: 25 October 2004
PDF: 11 pages
Proc. SPIE 5603, Machine Vision and its Optomechatronic Applications, (25 October 2004); doi: 10.1117/12.571001
Show Author Affiliations
Taeho Ha, Osaka Univ. (Japan)
Yasuhiro Takaya, Osaka Univ. (Japan)
Takashi Miyoshi, Osaka Univ. (Japan)
Shingo Ishizuka, Digital Process Ltd. (Japan)
Tatsuhiko Suzuki, Digital Process Ltd. (Japan)


Published in SPIE Proceedings Vol. 5603:
Machine Vision and its Optomechatronic Applications
Shun'ichi Kaneko; Hyungsuck Cho; George K. Knopf; Rainer Tutsch, Editor(s)

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