A fast reconstruction method for three-dimensional shape measurement using dual-frequency grating projection and phase-to-height lookup table

Guo, Wenbo; Wu, Zhoujie; Xu, Ruiling; Zhang, Qican; Fujigaki, Motoharu

doi:10.1016/j.optlastec.2018.11.009

Cited by 42 publications

(5 citation statements)

References 21 publications

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“…During the vertex processing phase, vertices and primitives, such as conversion operations, stored in the buffer are processed. In the rasterization phase, the updated pixels are passed to the rasterized unit upon clipping [11,12] by converting each pixel into a set of slices. Here, the slice is defined as a set of data, i.e., pixels that can not only be placed in the frame cache but also can be culled out and the pixels in the color buffer defined as a memory space that stores the pixels displayed on the screen.…”

Section: Graphical Rendering Processmentioning

confidence: 99%

Research on Visual Image Texture Rendering for Artistic Aided Design

Xiao

2021

Scientific Programming

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The rendering effect of known visual image texture is poor and the output image is not always clear. To solve this problem, this paper proposes a visual image rendering based on scene visual understanding algorithm. In this approach, the color segmentation of known visual scene is carried out according to a predefined threshold, and the segmented image is processed by morphology. For this purpose, the extraction rules are formulated to screen the candidate regions. The color image is fused and filtered in the neighborhood, the pixels of the image are extracted, and the 2D texture recognition is realized by multilevel fusion and visual feature reconstruction. Using compact sampling to extract more target features, feature points are matched, the coordinate system of known image information are integrated into a unified coordinate system, and design images are generated to complete art-aided design. Simulation results show that the proposed method is more accurate than the original method for extracting the information of known images, which helps to solve the problem of clearly visible output images and improves the overall design effect.

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Section: Graphical Rendering Processmentioning

confidence: 99%

Research on Visual Image Texture Rendering for Artistic Aided Design

Xiao

2021

Scientific Programming

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“…5(e), and φ(x, y). All 2π discontinuities of φ(x, y) can be accurately located, so that unwrapped phase Φ(x, y) shown in figure 6(c) can be easily calculated by equation (5). To recover 3D surface information h(x, y) shown in figure 7(d), the phase-to-height algorithm [34] is widely used as follows:…”

Section: Binarization Of Captured Deformed Line Patternmentioning

confidence: 99%

“…Due to the advantages of non-contact, high speed, and high precision, optical measuring techniques based on structured light [1][2][3][4][5] and interferometry [6][7][8] have developed rapidly and been widely used in various fields in the past few decades. Fringe projection profilometry is one of structured light techniques and can be divided into two categories: Fourier transform profilometry (FTP) and phase-shifting profilometry * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…Figure7(a) shows the wrapped phase φ(x, y) obtained from three-step phase-shifting deformed patterns, and figure7(b)shows the cutaway views in 512th column of the SPB deformed line pattern shown in figure5(b), the fringe order shown in figure5(e), and φ(x, y). All 2π discontinuities of φ(x, y) can be accurately located, so that unwrapped phase Φ(x, y) shown in figure6(c) can be easily calculated by equation(5). To recover 3D surface information h(x, y) shown in figure7(d), the phase-to-height algorithm[34] is widely used as follows:…”

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confidence: 99%

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A novel spatial phase-unwrapping method based on single-pixel binarized line pattern for real-time 3D measurement

An¹,

Cao²,

Wu³

et al. 2021

J. Opt.

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A new spatial phase-unwrapping algorithm based on single-pixel binarized (SPB) line pattern is proposed. The conventional spatial phase-unwrapping method produces easily the accumulation and propagation of errors for the wrapped phase in the regions with isolated 2π jumps generated by shadow and sharp changing surfaces. In this paper, the SPB deformed line pattern extracted by the proposed small window retrieval method can determine accurately the corresponding fringe order; then the wrapped phase is unwrapped point-to-point, in which the small window is adaptive for each light line. The measuring accuracy of the proposed method is close to the quality-guided method with high precision, but it performs simultaneously at higher robustness to measure a multi-object image. Only one additional SPB line pattern is projected and the phase-unwrapping process does not involve a time-consuming point-by-point sorting, so the proposed method can be applied to the real-time 3D measurement. The experimental results verify the feasibility and effectiveness of the proposed method.

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“…To obtain the three-dimensional (3D) shape of a workpiece, many researchers use phase-to-height mapping. (5,6) Phase-to-height mapping is an indispensable part of a 3D shape measurement system based on phase analysis and guarantees the accuracy of 3D reconstruction. This mapping can reconstruct the full 3D shape of the workpiece.…”

Section: Introductionmentioning

confidence: 99%

Flatness and Thickness Measurements of Circular Plate Component Using Laser Distance Meter

Yeh¹,

Chen²,

Chen³

et al. 2022

Sensors and Materials

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In this paper, we propose an innovative method for measuring the thickness, flatness, and Abbe angle of a disc. This innovative method includes three laser distance meters and one standard plate. In general, the three laser distance meters are used to determine the thickness and flatness of a disc. The Abbe angle is determined using the laser distance meter and reference plate. Our analytical results show that the proposed method can be used to obtain the precise thickness and flatness of a disc. The resolution of the measurement method is 1 μm. The flatness is measured by the least squares method. The front and back laser distance meters simultaneously measure the warp and wrinkle. The maximum deviation of the measured thickness of a disc is reduced by using two laser distance meters to determine the effects of warp and wrinkle. The thickness, flatness, warp, and wrinkle of a disc are measured quickly and conveniently.

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A fast reconstruction method for three-dimensional shape measurement using dual-frequency grating projection and phase-to-height lookup table

Cited by 42 publications

References 21 publications

Research on Visual Image Texture Rendering for Artistic Aided Design

Research on Visual Image Texture Rendering for Artistic Aided Design

A novel spatial phase-unwrapping method based on single-pixel binarized line pattern for real-time 3D measurement

Flatness and Thickness Measurements of Circular Plate Component Using Laser Distance Meter

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