RGB-tricolor-based fast phase measuring profilometry

Yiping Cao; Xianyu Su

doi:10.1117/12.471906

20 September 2002 RGB tricolor based fast phase measuring profilometry

Yiping Cao, Xianyu Su

Proceedings Volume 4919, Advanced Materials and Devices for Sensing and Imaging; (2002) https://doi.org/10.1117/12.471906
Event: Photonics Asia, 2002, Shanghai, China

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.

Citation Download Citation

Yiping Cao and Xianyu Su "RGB tricolor based fast phase measuring profilometry", Proc. SPIE 4919, Advanced Materials and Devices for Sensing and Imaging, (20 September 2002); https://doi.org/10.1117/12.471906

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