Three-dimensional shape measurement with a fast and accurate approach

Wang, Zhaoyang; Du, Hua; Park, Seungbae; Xie, Huimin

doi:10.1364/ao.48.001052

Cited by 67 publications

(42 citation statements)

References 31 publications

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“…Temporal phase unwrapping approach [1,[15][16][17] is applied for phase unwrapping, which is also called as multifrequency fringe projection phase unwrapping method. One of the merits of this phase unwrapping method is its robustness.…”

Section: Methodsmentioning

confidence: 99%

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Compact fringe projection profilometer

et al. 2009

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A compact fringe projection profilometer is recently developed for profiling small objects. A handphone-size microprojector with LED illumination is assembled into our system to minimize the size optical 3D sensor. In our compact 3D shape measurement system, the approaches of phase shifting, temporal phase unwrapping and modified least-squares calibration are utilized to achieve high precision and an easy procedure. The portable system allows for easy and convenient 3D profile measurement to meet the requirements under diverse application conditions, such as profiling small turbine blades in aerospace workshop. Experimental results testify to the robust and reliable performance of this LED micro-projector based FPP system.

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Section: Methodsmentioning

confidence: 99%

“…The needs of 3D profile measurement are catered for many industry applications, such as product inspection, animation design, quality control, reverse engineering, and etc [1][2][3][4]. The demand for fast and high accuracy 3D profile measurement has been rising over the years.…”

Section: Introductionmentioning

confidence: 99%

Compact fringe projection profilometer

et al. 2009

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“…The most typical method for phase unwrapping is to project and observe Gray code sequences 13 . Other approaches use multi frequency techniques as described by Li et al 14 , Wang et al 15 , and Kim et al 16 , or the additional projection of markers (see Zhang and Yau 17 ) into the images.…”

Section: Phase Shifting Measurement Techniquesmentioning

confidence: 99%

Phase unwrapping using geometric constraints for high-speed fringe projection based 3D measurements

2013

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A new methodology for 3D surface measurement based on phase shifted fringe pattern projection is presented which enables real-time measurement and high-speed performance of 3D measurements using stereo camera observation. The essence of the new technique is a drastic reduction of the fringe code which makes the process of pattern projection and image recording faster and real-time applicable. The new algorithm allows the complete omission of the typically used Gray code sequence or other additional code to the phase shifted sinusoidal fringe sequence. Its main concept is a special geometric design of the arrangement of the projection unit in relation to one of the involved cameras. The 3D point calculation is performed by triangulation between the two cameras with the help 3D point determination between the projection unit and one of the cameras. Whereas the second mode ensures the uniqueness, mode one realizes the accurate calculation. The realization of the uniqueness of the measurement is obtained by a corresponding arrangement of the parameters projected fringe width, the measurement volume size, the triangulation angle between the principal rays of first camera and the projection unit, and camera constants of second camera and projection unit. First experiments with a 3D measurement systems based on fringe projection technique show the robustness of the new method. Real time measurements can be performed which is the precondition of the supervision or quality check of several dynamic processes

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“…Over the years, a number of fringe projection techniques have been developed including some high-speed ones [4][5][6]. As noted in Ref.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast 3-D shape measurement with an off-the-shelf DLP projector

Gong¹,

Zhang²

2010

Opt. Express

108

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This paper presents a technique that reaches 3-D shape measurement speed beyond the digital-lightprocessing (DLP) projector's projection speed. In particular, a "solid-state" binary structured pattern is generated with each micro-mirror pixel always being at one status (ON or OFF). By this means, any time segment of projection can represent the whole signal, thus the exposure time can be shorter than the projection time. A sinusoidal fringe pattern is generated by properly defocusing a binary one, and the Fourier fringe analysis means is used for 3-D shape recovery. We have successfully reached 4,000 Hz rate (80 µs exposure time) 3-D shape measurement speed with an off-the-shelf DLP projector. Abstract:This paper presents a technique that reaches 3-D shape measurement speed beyond the digital-light-processing (DLP) projector's projection speed. In particular, a "solid-state" binary structured pattern is generated with each micro-mirror pixel always being at one status (ON or OFF). By this means, any time segment of projection can represent the whole signal, thus the exposure time can be shorter than the projection time. A sinusoidal fringe pattern is generated by properly defocusing a binary one, and the Fourier fringe analysis means is used for 3-D shape recovery. We have successfully reached 4,000 Hz rate (80 μs exposure time) 3-D shape measurement speed with an off-the-shelf DLP projector. 16. X. Y. Su, W. S. Zhou, G. Von Bally, and D. Vukicevic, "Automated phase-measuring profilometry using defocused projection of a Ronchi grating," Opt. Commun. 94, 561-573 (1992). 17. X. Su and Q. Zhang, "Dynamic 3-D shape measurement method: A review," Opt. Laser Eng. 48, 191-204 (2010).

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Three-dimensional shape measurement with a fast and accurate approach

Cited by 67 publications

References 31 publications

Compact fringe projection profilometer

Compact fringe projection profilometer

Phase unwrapping using geometric constraints for high-speed fringe projection based 3D measurements

Ultrafast 3-D shape measurement with an off-the-shelf DLP projector

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