An improved stair phase encoding method for absolute phase retrieval |
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| Institution: | 1. School of Physics, Shandong University, Jinan 250100, China;2. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China;1. Beihang University, School of Instrumentation Science and Opto-electronics Engineering, XueYuan Road No. 37, HaiDian District, Beijing 100191, China;2. Key Laboratory of Technology and Application for Safeguarding of Marine Rights and Interests, SOA, Guangzhou 510301, China;1. Mechanical Engineering Department, Iowa State University, Ames, IA 50011, United States;2. John Deere Product Engineering Center, Waterloo, IA 50704, United States;1. Shandong Provincial Key Laboratory of Laser Technology and Application, Department of Optics, School of Information Science and Engineering, Shandong University, Jinan 250100, China;2. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;3. School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Wollongong, NSW 2522, Australia;1. Key Laboratory of Nondestructive Testing, Education Ministry of China, Nanchang Hangkong University, Nanchang, Jiangxi Province 330063, China;2. Shenzhen Xinghua Wei Technology Co., LTD., Shenzhen, Guangdong Province 518101, China |
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| Abstract: | An improved phase unwrapping method is proposed to reduce the projection fringes in three-dimensional (3D) surface measurement. Color fringe patterns are generated by encoding with sinusoidal fringe and stair phase fringe patterns in red and blue channels. These color fringe patterns are projected onto the tested objects and then captured by a color CCD camera. The recorded fringe patterns are separated into their RGB components. Two groups of four-step phase-shifting fringe patterns are obtained. One group of the stripes are four sinusoidal patterns, which are used to determine the wrapped phase. The other group of stripes are four sinusoidal patterns with the codeword embedded into stair phase, whose stair changes are perfectly aligned with the 2π discontinuities of sinusoidal fringe phase, which are used to determine the fringe order for the phase unwrapping. The experimental results are analyzed and compared with those of the method in Zheng and Da (2012. Opt Express 20(22):24139–24150). The results show that the proposed method needs only four fringe patterns while having less error. It can effectively reduce the number of projection fringes and improve the measuring speed. |
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| Keywords: | Stair phase Phase measuring profilometry (PMP) Phase unwrapping Fringe analysis |
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