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A study on the 3-D measurement by using digital projection moiré method |
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| Authors: | Weon-Jae Ryu Young-June Kang Shin-Jae Kang |
| Institution: | a R&D Department, Jeonju Machinery Research Center, Jeonju, Republic of Korea b The Faculty of Mechanical and Aerospace System Engineering, Chonbuk Nat’l University, Jeonju, Republic of Korea c Korea Atomic Energy Research Institute, Daejeon, Republic of Korea |
| Abstract: | Moiré topography method is a well-known non-contacting 3-D measurement method. Recently, the automatic 3-D measurement technique by moiré topography has been developed in order to apply to the engineering and medical fields. The projection moiré topography is very attractive because of its high measuring speed and high sensitivity. In this paper, using the two-wavelength methods of projection moiré topography was investigated to measure the 3-D shape of an object with 2π-ambiguity problems. Rapid measurement can be accomplished by the synchronization between CCD camera and projector. The experimental results prove that the proposed scheme is capable of finding absolute fringe orders, so that the 2π-ambiguity problems can be effectively overcome so as to treat large step discontinuities in measured objects. |
| Keywords: | Projection moiré Two-wavelength method Phase-shifting technique 2π-ambiguity Human bust |
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