Two-frequency phase-shifting method vs. Gray-coded-based method in dynamic fringe projection profilometry: A comparative review

Wu, Zhoujie; Guo, Wenbo

doi:10.1016/j.optlaseng.2022.106995

Cited by 87 publications

(30 citation statements)

References 131 publications

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“…Gray coding is a robust binary coding strategy because there is only one hamming distance between two adjacent decoding words. So, it is often used to resist strong noise 37 – 39 . In this work, complementary Gray code method 40 is adopted to ensure the robust phase unwrapping.…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional shape and deformation measurement on complex structure parts

Guo

Chen

et al. 2022

Sci Rep

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Stereo digital image correlation technique (stereo-DIC or 3D-DIC) has been widely used in three-dimensional (3D) shape and deformation measurement due to its high accuracy and flexibility. But it is a tough task for it to deal with complex structure components because of the severe perspective distortion in two views. This paper seeks to resolve this issue using a single-camera system based on DIC-assisted fringe projection profilometry (FPP). A pixel-wise and complete 3D geometry of complex structures can be reconstructed using the robust and efficient Gray-coded method based on a FPP system. And then, DIC is just used to perform the temporal matching and complete full-field pixel-to-pixel tracking. The in- and out-of-plane deformation are obtained at the same time by directly comparing the accurate and complete 3D data of each corresponding pixel. Speckle pattern design and fringe denoising methods are carefully compared and chosen to simultaneously guarantee the measuring accuracy of 3D shape and deformation. Experimental results demonstrate the proposed method is an effective means to achieve full-field 3D shape and deformation measurement on complex parts, such as honeycomb structure and braided composite tube, which are challenging and even impossible for the traditional stereo-DIC method.

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Section: Methodsmentioning

confidence: 99%

Three-dimensional shape and deformation measurement on complex structure parts

Guo

Chen

et al. 2022

Sci Rep

Self Cite

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“…Furthermore, the decrease in image numbers simplifies the measurement process, but the phase jumping and discontinuities in the conventional spatial phase unwrapping reduce the stability when measuring complicated specular surfaces or discontinuous surfaces [ 18 , 23 , 24 , 25 , 26 ]. In the field of dynamic 3D shape measurement, two-frequency fringe projection profilometry employs an additional group of phase-shifting patterns with lower frequency to assistant pixel-by-pixel phase unwrapping, avoiding the phase ambiguities introduced by sinusoidal patterns and the arctangent function [ 18 , 24 ]. Research showed that another frequency pattern can assist phase unwrapping and lower the influence of phase ambiguity [ 18 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Specular Surface Shape Measurement with Orthogonal Dual-Frequency Fourier Transform Deflectometry

Yin

Yang

et al. 2023

Sensors

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Three-dimensional (3D) shape measurement for specular surfaces is becoming increasingly important in various applications. A novel orthogonal dual-frequency fringe is proposed in the specular surface shape measurement to overcome the phase jumping and discontinuities in spatial phase unwrapping. The fringe recalibrated high-accuracy phase information from its high-frequency fringe component with low-ambiguity phase information from its low-frequency fringe component. An improved Fourier transform deflectometry method based on the orthogonal dual-frequency fringe is proposed to measure 3D specular surface shapes. Simulation results showed that the orthogonal dual-frequency Fourier transform deflectometry (ODD) method could precisely reconstruct flat surfaces with an error of 2.16 nm rms, and concave surfaces with an error of 1.86 μm rms. Experimental results showed that the reconstructed shapes of both the flat mirror and the concave mirror measured by the ODD measurement system were highly comparable to those obtained by the phase-measuring deflectometry (PMD) method. This new fringe provides a distinctive approach to structured pattern construction and reduces the phase unwrapping ambiguities in specular surface shape measurement. The ODD method can achieve accurate 3D shape measurement for specular surfaces by sampling only one fringe, providing a possible basis for future real-time measurement of specular surfaces.

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“…Projected fringe patterns are used to modulate the geometrical information and the 3D shape data of an object can be solved through the established mapping relationship between phase and shape information. The temporal phase unwrapping method (TPU) [3,4] requires multiple captured phase-shifting fringe patterns to reconstruct absolute shape information for static scenes. The emergence of high-speed projectors and high-speed cameras has broadened the use of the TPU method in dynamic scenes, and the adjacent images can be considered undeformed due to the extremely short interval to obtain the shape of the object at each moment [5].…”

Section: Introductionmentioning

confidence: 99%

3D shape, deformation and strain measurement on complex structure using DIC-assisted fringe projection profilometry

Chen

Wang

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

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Stereo digital image correlation (3D-DIC or Stereo-DIC) has advantages of high accuracy and flexibility, and is widely used for 3D shape and deformation reconstruction. However, it is difficult to retrieve information of complex structure due to the severe perspective distortion in both views and areabased matching algorithm. And on the other hand, fringe projection profilometry (FPP) has pixelwise 3D shape reconstruction ability for complex structure but lacks accurate deformation and strain analyzing ability. In this work, we combine DIC with FPP to simultaneously obtain accurate 3D shape and deformation information and further perform strain analysis. First, the complete 3D shape of complex surface is reconstructed pixel by pixel using FPP. Next, the modulation of the phase-shifting fringes is extracted as texture maps to eliminate the interference of ambient light and for further DIC processing. DIC is only used to perform temporal matching for pixel-by-pixel tracking on reconstructed 3D shape. The in-plane and out-of-plane deformations are obtained simultaneously by directly comparing the complete 3D data for each corresponding pixel. Moreover, the strain in each direction is calculated by differencing the deformation data with chain rule. Experiments on the complex dynamic scene demonstrate the feasibility of the proposed method and show potential in analysis of specimen with complex structure.

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Two-frequency phase-shifting method vs. Gray-coded-based method in dynamic fringe projection profilometry: A comparative review

Cited by 87 publications

References 131 publications

Three-dimensional shape and deformation measurement on complex structure parts

Three-dimensional shape and deformation measurement on complex structure parts

Specular Surface Shape Measurement with Orthogonal Dual-Frequency Fourier Transform Deflectometry

3D shape, deformation and strain measurement on complex structure using DIC-assisted fringe projection profilometry

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