An improved phase-coding method for absolute phase retrieval based on the path-following algorithm

Lv, Shenzhen; Sun, Quan; Yang, Jianbai; Jiang, Yang; Qu, Feng; Wang, Jian

doi:10.1016/j.optlaseng.2019.05.024

Cited by 13 publications

(3 citation statements)

References 37 publications

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“…Phase encoding requires a certain number of code words, which can produce artifacts when the phase unwraps. To solve this problem, Shenzhen Lv [ 54 ] et al adopted a path tracking method to improve the retrieval quality of the absolute phase and extracted fringe patterns through image segmentation processing. This approach applies not only to phase coding but also to binary coding and gray coding.…”

Section: Multi-view Stereo Vision Measurement Methodsmentioning

confidence: 99%

Three-Dimensional Morphology and Size Measurement of High-Temperature Metal Components Based on Machine Vision Technology: A Review

Wen

Wang

Zhang

et al. 2021

Sensors

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The three-dimensional (3D) size and morphology of high-temperature metal components need to be measured in real time during manufacturing processes, such as forging and rolling. Since the surface temperature of a metal component is very high during the forming and manufacturing process, manually measuring the size of a metal component at a close distance is difficult; hence, a non-contact measurement technology is required to complete the measurement. Recently, machine vision technology has been developed, which is a non-contact measurement technology that only needs to capture multiple images of a measured object to obtain the 3D size and morphology information, and this technology can be used in some extreme conditions. Machine vision technology has been widely used in industrial, agricultural, military and other fields, especially fields involving various high-temperature metal components. This paper provides a comprehensive review of the application of machine vision technology in measuring the 3D size and morphology of high-temperature metal components. Furthermore, according to the principle and method of measuring equipment structures, this review highlights two aspects in detail: laser scanning measurement and multi-view stereo vision technology. Special attention is paid to each method through comparisons and analyses to provide essential technical references for subsequent researchers.

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Section: Multi-view Stereo Vision Measurement Methodsmentioning

confidence: 99%

Three-Dimensional Morphology and Size Measurement of High-Temperature Metal Components Based on Machine Vision Technology: A Review

Wen

Wang

Zhang

et al. 2021

Sensors

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“…With the development of machine automation and artificial intelligence, the demand for machine vision is gradually increasing [1][2][3][4]. Thus, the acquisition of three-dimensional (3D) surface information of objects in industry has become particularly important.…”

Section: Introductionmentioning

confidence: 99%

Line-encoded structured light measurement method in measuring shiny and transparent objects

Yang

Yang²,

Wu³

et al. 2023

J. Opt.

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Structured Light Measurement (SLM) has been widely used in acquiring the three-dimensional (3D) shape of objects because of its high precision and high speed. However, the intensity based structured light coding strategies like sinusoidal patterns is difficult to measure transparent and shiny objects with high dynamic range (HDR) surface reflectance due to inaccurate light intensity information. Divergent multi-line structured light projection avoids this problem by extracting lines. But it requires a lot of gray-code patterns to unwrap the phase, which reduces the measurement efficiency. To overcome defects, this paper proposes a line-encoded few-pattern structured light measurement method in measuring shiny and transparent objects. In this method, we simultaneously extract the edge line, the center line and obtain their orders by projecting only five patterns. Many experiments were implemented to prove its accuracy and robustness. Because only five patterns are required, the proposed method greatly accelerate the process of reconstruction, which is indispensable for 3D real-time reconstruction. We conducted a dental model dynamic scanning experiment to prove it.

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“…To overcome the defects of these two traditional methods, numerous phase unwrapping algorithms have been developed. A series of phase-coding methods are proposed by embedding the information of the fringe order into fringe patterns to determine the corresponding fringe order [26][27][28][29][30] . Wang et al proposed a phase-coding method by projecting three-step phase-shifting patterns and three phase-coding patterns to acquire the absolute phase map [31] .…”

Section: Introductionmentioning

confidence: 99%

High-speed three-dimensional shape measurement with inner shifting-phase fringe projection profilometry

Yang

Huang

et al. 2022

Chin. Opt. Lett.

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Fringe projection profilometry (FPP) has been extensively studied in the field of three-dimensional (3D) measurement. Although FPP always uses high-frequency fringes to ensure high measurement accuracy, too many patterns are projected to unwrap the phase, which affects the speed of 3D reconstruction. We propose a high-speed 3D shape measurement method using only three high-frequency inner shifting-phase patterns (70 periods), which satisfies both high precision and high measuring speed requirements. Besides, our proposed method obtains the wrapped phase and the fringe order simultaneously without any other information and constraints. The proposed method has successfully reconstructed moving objects with high speed at the camera's full frame rate (1700 frames per second).

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An improved phase-coding method for absolute phase retrieval based on the path-following algorithm

Cited by 13 publications

References 37 publications

Three-Dimensional Morphology and Size Measurement of High-Temperature Metal Components Based on Machine Vision Technology: A Review

Three-Dimensional Morphology and Size Measurement of High-Temperature Metal Components Based on Machine Vision Technology: A Review

Line-encoded structured light measurement method in measuring shiny and transparent objects

High-speed three-dimensional shape measurement with inner shifting-phase fringe projection profilometry

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