Study on a novel phase-recovering algorithm for partial intensity saturation in digital projection grating phase-shifting profilometry

Hu, Eryi; He, Yuming; Chen, Yanming

doi:10.1016/j.ijleo.2008.05.010

Cited by 21 publications

(15 citation statements)

References 9 publications

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“…Local sensor uses high-dynamic range N-step fringe projection profilometry to solve problems of overexposure caused by strong reflection [4]. S-step phase-shifted sinusoidal fringe patterns are projected, which can be expressed as…”

Section: Composite Optical Measurement Methodsmentioning

confidence: 99%

An automated 3D shape measurement method for turbine blade using a 6-axis robot

Wang

Jiang

Zhao

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

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High-accuracy 3-D shape measurement of turbine blade is important for manufacturing engine and aircraft's safety. At present, the most commonly used three-coordinate measuring machine in the industrial field may cause scratches on the surface of turbine blade. Optical 3-D measurement methods, such as fringe projection profilometry, are unable to carry out targeted measurement of geometric structures with different levels of precision. This paper presents an automatic measurement method based on pneumatic gripper and 6-axis robot. The proposed composite system includes global sensor with large scanning range and local sensor with high accuracy, which can perform 3-D reconstruction with specific resolution for different positions of turbine blade. We use a 6-axis robot and pneumatic gripper to grasp the turbine blade automatically. The 3-D scanning is completed according to the viewpoints planned in advance. The point cloud data of different angles are aligned to obtain a high precision 3-D model of turbine blade surface. The experimental results show that the proposed automatic scanning method can effectively avoid the measurement error caused by manual grasping operation. On the basis of complete 3-D measurement of the whole surface, more dense point cloud data are obtained for fine structures such as blade edge. Our result is of great significance to the field of industrial measurement.

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Section: Composite Optical Measurement Methodsmentioning

confidence: 99%

An automated 3D shape measurement method for turbine blade using a 6-axis robot

Wang

Jiang

Zhao

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

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“…If the ambient light is strong, the image will partial saturated and error of the calculated phase will occur. A saturation coefficient K is defined to describe the saturation degree of the captured fringe patterns [11][12][13] .…”

Section: Variation Of Ambient Lightmentioning

confidence: 99%

“…Generally speaking, the phase information can be obtained from three unsaturated gray values at the same pixel position. The equation can be expressed as [11][12][13] (12) Proc. of SPIE Vol.…”

Section: Variation Of Ambient and Its Compensationmentioning

confidence: 99%

Error analysis of a 3D imaging system based on fringe projection technique

Zhang

Dai

2013

SPIE Proceedings

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In the past few years, optical metrology has found numerous applications in scientific and commercial fields owing to its non-contact nature. One of the most popular methods is the measurement of 3D surface based on fringe projection techniques because of the advantages of non-contact operation, full-field and fast acquisition and automatic data processing. In surface profilometry by using digital light processing (DLP) projector, many factors affect the accuracy of 3D measurement. However, there is no research to give the complete error analysis of a 3D imaging system. This paper will analyze some possible error sources of a 3D imaging system, for example, nonlinear response of CCD camera and DLP projector, sampling error of sinusoidal fringe pattern, variation of ambient light and marker extraction during calibration. These error sources are simulated in a software environment to demonstrate their effects on measurement. The possible compensation methods are proposed to give high accurate shape data. Some experiments were conducted to evaluate the effects of these error sources on 3D shape measurement. Experimental results and performance evaluation show that these errors have great effect on measuring 3D shape and it is necessary to compensate for them for accurate measurement.

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“…Moreover, Chen et al [27] proposed a technique, by which the phase is also calculated from raw phase-shifting images but without considering whether they are saturated or not. Hu et al [28,29] introduced a phase-shifting based method by taking advantage of no less than three unsaturated fringe image from standard N -step phase-shifting algorithm.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, there will be more saturated areas when using higher frequency fringes. Inspired by the works proposed by Hu et al [28,29], we propose an HDR measurement method which takes advantage of the generalized phase-shifting algorithm and considers the spatial frequency characteristic of multi-frequency fringe patterns in the microscopic measurement applications. Specifically, phase values in the regions without any saturation are calculated directly using the standard phase-shifting algorithm.…”

Section: Introductionmentioning

confidence: 99%

Microscopic 3D measurement of shiny surfaces based on a multi-frequency phase-shifting scheme

Chen

Liang

et al. 2019

Optics and Lasers in Engineering

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Microscopic fringe projection profilometry is a powerful 3D measurement technique with a theoretical measurement accuracy better than one micron provided that the measured targets can be imaged with good fringe visibility. However, practically, the 3D shape of the measured surface can hardly be fully reconstructed due to the defocus of the dense fringes and complex surface reflexivity characteristics, which lead to low fringe quality and intensity saturation. To address this problem, we propose to calculate phases of these highlighted areas from a subset of the fringe sequence which is not subjected to the intensity saturation. By using the proposed multi-frequency phase-shifting scheme, the integrity of the 3D surface reconstruction can be significantly improved. The ultimate phase maps obtained from unsaturated intensities are used to achieve high-accuracy 3D recovering of shiny surfaces based on a phase stereo matching method. Experimental results on different metal surfaces show that our approach is able to retrieve the complete morphology of shiny surfaces with high accuracy and fidelity.

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Study on a novel phase-recovering algorithm for partial intensity saturation in digital projection grating phase-shifting profilometry

Cited by 21 publications

References 9 publications

An automated 3D shape measurement method for turbine blade using a 6-axis robot

An automated 3D shape measurement method for turbine blade using a 6-axis robot

Error analysis of a 3D imaging system based on fringe projection technique

Microscopic 3D measurement of shiny surfaces based on a multi-frequency phase-shifting scheme

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