Affiliation:
1. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
2. HIT Wuhu Robot Technology Research Institute, Wuhu 241000, People's Republic of China
3. State Key Laboratory of Robotics and System (HIT), Harbin 150001, People's Republic of China
Abstract
Digital fringe projection profilometry based on phase-shifting technology is a reliable method for complex shape measurement, and the phase is one of the most important factors affecting measurement accuracy. The calculation of the absolute phase depends on the calculation of the wrapped phase and encoding technology. In this paper, a technique of obtaining the absolute phase of multi-frequency heterodyne fringe images using the Hilbert transform is presented. Since the wrapped phase can be calculated from only one fringe image of each frequency, the method does not need phase-shifting. The absolute phase can be obtained from the wrapped phase by applying the heterodyne method. The measurement time and computational complexity are dramatically reduced, the measurement efficiency is greatly improved, and this benefit from the number of images is greatly reduced. The experimental results show that the method presented in this paper performs well in the application, and the accuracy is no different from that of the phase-shifting method while the efficiency is greatly improved.
Funder
National Nature Science Foundation of China
National Postdoctoral Program for Innovative Talents
China Postdoctoral Science Foundation
Heilongjiang Postdoctoral Fund
Aeronautical Science Foundation of China
Heilongjiang Natural Science Foundation
Heilongjiang Major Special Projects of Engineering Science and Technology
Self-planned Task of State Key Laboratory of Robotics and Systemand the Programme of Introducing Talents of Discipline of Universities
Foundation for Innovative Research Groups of the National Nature Science Foundation of China
HIT Wuhu Robot Technology Research Institute
Subject
General Physics and Astronomy
Cited by
1 articles.
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