Advanced method of global phase shift estimation from two linear carrier interferograms

Sun, Wenqing; Wang, Ting; Zhao, Yun; Wang, Jun; Wu, Quanying

doi:10.1186/s41476-018-0076-x

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…1 To get accurate 3-D shape measurement results, many technologies have been researched, such as Moire technique, 2 phase-measuring profilometry (PMP), [3][4][5][6] and Fourier transform profilometry (FTP). [7][8][9] In general, it is significant to use fewer fringe patterns to get the results in a high-speed measurement. 10 Because oneshot technologies only need one frame to get the wrapped phase, they have the potential to be used in high-speed measurement.…”

Section: Introductionmentioning

confidence: 99%

High-speed three-dimensional shape measurement using phase measurement profilometry without phase unwrapping

Yang

2018

Opt. Eng.

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In the fast three-dimensional (3-D) shape measurement, it is an important factor to use the least number of the fringe pattern to get 3-D shape measurement of arbitrary objects. Although one-shot technologies can use one-frame deformed fringe pattern to get the wrapped phase, they are easily affected by the surface property and suffer from poor spatial resolution. In addition to the process, phase unwrapping may affect the quality of absolute phase. This paper proposes a fast measurement method based on a phase measurement profilometry and stereo vision system. This method can reconstruct 3-D surface without phase unwrapping. Using original image matching constraint, a rough parallax is used in the phase matching. To resist the false matching, subpixel parallax optimization is used to reduce the matching errors. To detect the edge point of wrapped phase, the average phase is calculated. Experimental results verify the feasibility of the proposed method and it can measure complex objects without phase unwrapping.

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Section: Introductionmentioning

confidence: 99%

High-speed three-dimensional shape measurement using phase measurement profilometry without phase unwrapping

Yang

2018

Opt. Eng.

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“…[1]. In order to get accurate 3D shape measurement results, a lot of technologies have been researched such as Moire technique (MT) [2], phase-measuring profilometry (PMP) [3][4][5][6], and Fourier transform profilometry (FTP) [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

High-speed 3D shape measurement using Fourier transform and stereo vision

Yang

2018

J. Eur. Opt. Soc.-Rapid Publ.

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Background: In the fast 3D shape measurement, it is an important factor to use the least number of fringe patterns to get the wrapped phase and the wrapped phase is always required to be retrieved to absolute phase. But the process of phase unwrapping may affect the quality of absolute phase. Besides absolute phase retrieval is time-costing especially for high-speed 3D shape measurement. Methods: This paper proposes a fast measurement method based on Fourier transform profilometry and stereo vision. Because of the property of stereo vision, every point can find its corresponding point in the wrapped phase. This method can reconstruct 3D surface without phase unwrapping. In order to further increase the measurement speed and overcome the gamma effect of projector, the dithering fringe pattern is used. To resist false matching, the original image matching constraint gives a rough parallax. Phase matching and sub-pixel parallax optimization are used to reduce the matching errors. In order to confirm the phase value of points which are at the edge of wrapped phase, average phase value is calculated. Results: A white mask is measured based on the proposed method. The results from every step show the effect of different functions. To better show the effect of the proposed method, a white house is measured and the measurement is compared with LSSM and MFH. In order to further to show the advantage of the proposed method, discontinuous blocks and continuous blocks are measured. The average height, RMS, average error, maximum error are compared with the method which uses absolute phase to match the corresponding points. Experiment results verify the feasibility of the proposed method and it can measure complex objects with high speed and accuracy. Conclusion: This paper uses Fourier transform and stereo vision to get wrapped phase and reconstruct 3D shape without phase unwrapping. The proposed method contains three part: phase matching, edge points detection and sub-pixel parallax optimization. By comparing matching precision, the proposed method can get high quality surface. Because the process of measurement only need one frame of deformed fringe pattern to get the wrapped phase and the matching process does not need phase unwrapping, the proposed method has the potential to be used in fast measurement.

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Advanced method of global phase shift estimation from two linear carrier interferograms

Cited by 2 publications

References 22 publications

High-speed three-dimensional shape measurement using phase measurement profilometry without phase unwrapping

High-speed three-dimensional shape measurement using phase measurement profilometry without phase unwrapping

High-speed 3D shape measurement using Fourier transform and stereo vision

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