The spatial phase-shifting measuring profilometry based on dual-frequency grating

An, Haihua; Cao, Yiping; Wu, Haitao; Zhang, Hechen; Li, Hongmei

doi:10.1016/j.optlaseng.2021.106638

Cited by 19 publications

(4 citation statements)

References 25 publications

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“…He et al, Li et al and An et al adopted three sinusoidal fringes composite pattern [8][9][10]. Wu et al, Hu et al and An et al adopted the multi-frequency composite pattern [11][12][13]. Zhai et al proposed a 2 + 1 orthogonal composite pattern based on the 2 + 1 phase-shift method [14].…”

Section: Introductionmentioning

confidence: 99%

3D reconstruction with single-frame two-step phase-shift method based on orthogonal composite fringe pattern projection

Wang,

Zhang,

Jiang

et al. 2024

Meas. Sci. Technol.

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In order to realize single-frame three-dimensional (3D) reconstruction, a single-frame two-step phase-shift method based on orthogonal composite pattern projection is proposed to solve the problem that the traditional N-step phase-shift profilometry needs multiple projections for 3D reconstruction. The orthogonal composite pattern uses only two carrier channels to reduce the spectrum overlapping influence on the demodulation accuracy of carrier and modulated fringes. A two-dimensional variational mode decomposition (2DVMD) method is adopted to remove the background DC component of the sinusoidal fringe to overcome the mode overlap problem by controlling the size of the bandwidth. Thus, the two-step phase-shift method is applied to calculate the phases for 3D reconstruction. The experimental results show that, compared with the typical Fourier Transform Profilometry (FTP) method , 3-step composite method and 2+1 composite method, the 3D reconstruction accuracy of the proposed method is improved by 49.1% ,31.4% and 23.2% respectively according to Mean Absolute Error (MAE), and by 73.0%, 58.4% and 56.8% respectively according to Mean Squared Error (MSE) as the evaluation index. Finally, the dynamic 3D reconstruction experiment demonstrates the good adaptability of dynamic 3D reconstruction.

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Section: Introductionmentioning

confidence: 99%

3D reconstruction with single-frame two-step phase-shift method based on orthogonal composite fringe pattern projection

Wang,

Zhang,

Jiang

et al. 2024

Meas. Sci. Technol.

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show abstract

“…Three-dimensional (3D) information has found wide applications in online inspection, visual reality (VR) and the protection of historical relics [ 1 , 2 , 3 , 4 ]. Fringe projection profilometry (FPP) [ 5 , 6 , 7 ] as a structured-light (SL) [ 8 ]-based method is one of the most representative active 3D measurement technologies owing to its being non-contact, have a high accuracy and a high resolution [ 9 , 10 , 11 ]. However, due to the limited dynamic range of the camera sensors, the pixels of patterns captured on surfaces with high reflection are prone to be saturated, leading to severe phase errors in FPP.…”

Section: Introductionmentioning

confidence: 99%

Saturation-Induced Phase Error Compensation Method Using Complementary Phase

Wan

Cao

et al. 2023

Micromachines

Self Cite

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Intensity saturation can induce phase error and, thus, measurement error in fringe projection profilometry. To reduce saturation-induced phase errors, a compensation method is developed. The mathematical model of saturation-induced phase errors is analyzed for N-step phase-shifting profilometry, and the phase error is approximately N-folder of the frequency of the projected fringe. Additional N-step phase-shifting fringe patterns with initial phase-shift π/N are projected for generating a complementary phase map. The final phase map is obtained by averaging the original phase map extracted from the original fringe patterns and the complementary phase map, and then the phase error can be canceled out. Both simulations and experiments demonstrated that the proposed method can substantially reduce the saturation-induced phase error and realize accurate measurements for a highly dynamic range of scenarios.

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“…Optical three-dimensional (3D) measuring methods based on structured light projection are widely used in many fields, such as industry, agriculture, and medicine, for their advantages of non-contact, high speed, high accuracy, and easy automation 1 – 5 Fourier transform profilometry (FTP) 6 – 8 and phase measuring profilometry (PMP) 9 , 10 are two typical methods among them. FTP was first proposed by Takeda 11 .…”

Section: Introductionmentioning

confidence: 99%

Double-shot N-step phase measuring profilometry

Cao

et al. 2023

Opt. Eng.

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.Recently, a single-shot N-step phase measuring profilometry was proposed by our research group. It not only maintains the single-shot real-time measuring characteristics but also makes its measuring accuracy selectable as appropriate N. But when the spectral aliasing in the captured deformed pattern is severe, the alternative current (AC) component may be extracted imprecisely or even failed. So, a double-shot N-step phase measuring profilometry (double-shot N-PMP) is proposed. While two complementary sinusoidal gratings are projected onto the measured object, the AC component of the captured deformed patterns can be extracted precisely even if spectrum aliasing is very serious. If the AC component multiplies with N frames of the AC components of the N-step phase-shifting fringe patterns captured from the reference plane in advance, a new N-step phase-shifting algorithm for the phase difference between the measured object and the reference plane is accomplished to reconstruct the measured object. The experimental results show the possibility and effectiveness of the proposed method. It can either improve the measuring accuracy or expand application scope. Though the double-frame gratings are needed, the real-time measuring characteristics can still maintain with the time-division multiplexing method.

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The spatial phase-shifting measuring profilometry based on dual-frequency grating

Cited by 19 publications

References 25 publications

3D reconstruction with single-frame two-step phase-shift method based on orthogonal composite fringe pattern projection

3D reconstruction with single-frame two-step phase-shift method based on orthogonal composite fringe pattern projection

Saturation-Induced Phase Error Compensation Method Using Complementary Phase

Double-shot N-step phase measuring profilometry

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