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Proceedings Paper

RGB-tricolor-based fast phase measuring profilometry
Author(s): Yiping Cao; Xianyu Su
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Paper Abstract

A fast phase measuring profilometry (PMP) using structured illumination with a digital micro-mirror device (DMD) has been extensively studied because of its advantage of the programmable projection. In the traditionary PMP, the phase-shift device is mechanical based and is controlled by step-motor which may cause phase errors more or less and several frames of deformed fringe patterns should be capture, which may take a longer time. In the system a DMD is used for projecting only one complex color distribution on the surface of the measured object. In the distribution three interlaced RGB based tricolor sinusoidal chroma two-dimensional fringe patterns are synchronously coded by which the phase difference of the patterns are 120 degree one another. A 24-bit color CCD digital camera is used as the detector to capture only one frame of the deformed complex color distributions. By using image separating techniques the three deformed interlaced tricolor sinusoidal chroma two-dimensional fringe patterns can be decoded individually. Using the 3-step phase shift algorithm the three-dimensional topography can be reconstructed from these decoded deformed fringe patterns. To improve the phase measurement accuracy the RGB tricolor based chroma transfer function (CTF) of the measuring system is introduced. The experiments show that by a reverse correction method with the CTF the phase measurement accuracy has been improved obviously.

Paper Details

Date Published: 20 September 2002
PDF: 8 pages
Proc. SPIE 4919, Advanced Materials and Devices for Sensing and Imaging, (20 September 2002); doi: 10.1117/12.471906
Show Author Affiliations
Yiping Cao, Sichuan Univ. (China)
Xianyu Su, Sichuan Univ. (China)

Published in SPIE Proceedings Vol. 4919:
Advanced Materials and Devices for Sensing and Imaging
Jianquan Yao; Yukihiro Ishii, Editor(s)

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