Spatial-temporal phase unwrapping algorithm for fringe projection profilometry

An, Haihua; Cao, Yiping; Wu, Haitao; Yang, Na; Xu, Chuan; Li, Hongmei

doi:10.1364/oe.430305

Cited by 34 publications

(2 citation statements)

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“…16 Phase unwrapping was applied to prove the correctness of the density-modulation method. The residues are an important evaluation indicator in phase unwrapping 17 ; therefore, the residues of Fig. 14 were calculated, and the results are shown in Fig.…”

Section: Actual Experiments and Discussionmentioning

confidence: 99%

Optical path modulation of interference fringe density based on position errors analysis in oblique laser interferometry

Yang

Lian

et al. 2022

Opt. Eng.

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When laser interferometry is applied to measure the form deviation of a helical tooth flank, dense interference fringes are almost inevitable because of the distorted shape of the helical tooth flank. The high-density fringe leads to poor processing accuracy of interferograms and is an important indicator of the interferogram quality. An optical path optimization method based on position errors analysis is proposed to modulate the fringe density. First, some factors that may affect fringe density in the optical system are modeled. Consequently, the incident angle of the measured light is proved to be the main factor affecting the fringe density and is the primary parameter that modulates the interference fringe density. Subsequently, an analytical model is established, and a fringe density modulation method based on the optimized incident angle is proposed for designing the optical path. Finally, simulated and actual experimental results are provided to verify the correctness of the analysis of the main factor affecting the fringe density and feasibility of the modulation method.

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Section: Actual Experiments and Discussionmentioning

confidence: 99%

Optical path modulation of interference fringe density based on position errors analysis in oblique laser interferometry

Yang

Lian

et al. 2022

Opt. Eng.

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“…Due to the advantages of non-contact and full-field scanning, phase-shifting profilometry (PSP) [1][2][3] has been widely used in many applications, such as engineering, industry and machine vision. The phase extracted from captured patterns is wrapped in the range from -π to π due to the arctangent function, so phase unwrapping is inevitable for obtaining the continuous 3-D shape of the objects [4,5] .…”

Section: Introductionmentioning

confidence: 99%

Absolute phase retrieval based on the sinusoidal codewords

Cao

2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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Minimizing the number of projecting patterns has been one of the most significant tasks in the field of phase-shifting profilometry. This paper proposes a projecting model of three phase-shifting patterns + one coded pattern to retrieve the absolute phase when measuring the object with isolated surfaces. Differing from the conventional stair-shaped codewords, the proposed sinusoidal codewords are extracted from phase-shifting patterns, and then successively encoded into different periods of one coded pattern. When decoding, four patterns provide one conventional wrapped phase with high precision and six coded phases to determine fringe order. After expanding fringe order, absolute phase can be calculated point-to-point. Experimental results demonstrate that the proposed approach can achieve a considerable measuring accuracy on the dynamic scene.

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