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Proceedings Paper

A new phase error compensation method of 3-D shape measurement system using DMD projector
Author(s): Haihua Cui; Xiaosheng Cheng; Ning Dai; Tianran Yuan; Wenhe Liao
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Paper Abstract

Structured light system using a digital micro-mirror device (DMD) projector is increasingly used for a 3-D shape measurement because of its digital nature. When the DMD projector is used in phase measuring profilometer (PMP), the precision of profile measurement will increase with the precision of phase-shift increasing. But the non-sinusoidal nature of the projected fringe patterns causes significant phase measurement error and consequent shape measurement error. In the reality, we find that the non-sinusoidal effect is never caused by only one factor. A real measurement shows that it is a combination of influences by all effects, e.g., the object independent irradiance function, the nonlinear gamma curve of the projector, the spatio-temporal characteristic of DMD, etc. In view of the above factors, a comprehensive compensation method is proposed to compensate these factors for the 3D measurement. If the compensation is well accomplished, the measurement error can be reduced average 6 times. The experiment is carried out to demonstrate the validity of this technique.

Paper Details

Date Published: 31 December 2008
PDF: 6 pages
Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 713041 (31 December 2008); doi: 10.1117/12.819704
Show Author Affiliations
Haihua Cui, Nanjing Univ. of Aeronautics and Astronautics (China)
Xiaosheng Cheng, Nanjing Univ. of Aeronautics and Astronautics (China)
Ning Dai, Nanjing Univ. of Aeronautics and Astronautics (China)
Tianran Yuan, Nanjing Univ. of Aeronautics and Astronautics (China)
Wenhe Liao, Nanjing Univ. of Aeronautics and Astronautics (China)


Published in SPIE Proceedings Vol. 7130:
Fourth International Symposium on Precision Mechanical Measurements
Yetai Fei; Kuang-Chao Fan; Rongsheng Lu, Editor(s)

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