Calibration of a fringe projection profilometry system using virtual phase calibrating model planes

Zhang, Xiaoling; Lin, Yu; Zhao, Meirong; Niu, Xiaobing; Huang, Yinguo

doi:10.1088/1464-4258/7/4/007

Cited by 38 publications

(10 citation statements)

References 22 publications

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“…Moreover, it does not take optical deformation into account. For these reasons we decided to use a more practical calibration procedure, which was based on a modified version of the virtual calibration-plane method proposed by Xiaoling et al (2005).…”

Section: Calibrationmentioning

confidence: 99%

Tracking the free surface of time-dependent flows: image processing for the dam-break problem

Cochard

Ancey

2007

Exp Fluids

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The dam-break problem (i.e., the sudden release of a given volume of fluid down a slope) has attracted a great deal of attention from mechanicians and physicists over the past few years, with particular interest devoted to the free-surface profile and the spreading rate. Experimentally, impediments to accurate measurements of the free-surface evolution are numerous because of the significant variations in its curvature and velocity. To accurately measure the surge's free-surface variations with time, we have developed a new imaging system, consisting of a digital camera coupled with a synchronized micromirror projector. The object's surface is imaged into a camera and patterns are projected onto the surface under an angle of incidence that differs from the imaging direction. From the deformed pattern recorded by the camera, the phase can be extracted and, by using unwrapping algorithms, the height can be computed and the free surface reconstructed. We were able to measure the free surface of the flow to within 1 mm over a surface of 1.8 · 1.1 m 2 . Although the techniques used in our system are not new when taken individually, the system in its entirety is innovative and more efficient than most methods used to-date in practical applications.

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Section: Calibrationmentioning

confidence: 99%

Tracking the free surface of time-dependent flows: image processing for the dam-break problem

Cochard

Ancey

2007

Exp Fluids

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“…In this study, the two reference planes based calibration system [21][22][23] is used. As shown in Fig.3, there are two parallel reference planes placed at positions z1 and z2, respectively.…”

Section: System Calibrationmentioning

confidence: 99%

“…(13) and (14). They are called as equi-coordinate phase [22] and equi-phase coordinate methods [23], respectively. Linear interpolation is applied to retrieve x coordinate in sub-pixel scale.…”

Section: System Calibrationmentioning

confidence: 99%

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A dual-frequency fringe projection three-dimensional shape measurement system using a DLP 3D projector

Dai

Yang

Liu

et al. 2017

Optics Communications

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A dual-frequency fringe projection system for three-dimensional (3D) surface shape measurement is proposed in this paper. The system includes two cameras, a DLP 3D projector, and a liquid crystal (LC) shutter glasses. The phase information related to the object height is obtained from the dual-frequency temporal method with 3-step phase-shifting algorithm. By using the DLP 3D projector and LC shutter glasses, 3-step phase-shifting high-frequency and low-frequency fringe patterns are captured only 3 times by the two cameras synchronously. The technique of image registration is applied to low-frequency fringe patterns to guarantee the accuracy of low-frequency phase for high-frequency phase unwrapping. Using the equi-phase coordinate method based on two reference planes, the phase-to-height conversion and non-sinusoidal errors reduction are carried out in one go without any extra operation or measurement time. Experimental results demonstrate that the proposed method effectively improves the measuring speed, and it is valid for measuring surface shapes with multi-steps or discontinuities.

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“…where 𝑎(𝑥, 𝑦), 𝑏(𝑥, 𝑦) and 𝑐(𝑥, 𝑦) are the parameters related to the measurement system, which can be determined by a calibration process in advance [38]- [40]. To calculate the system constants 𝑎(𝑥, 𝑦), 𝑏(𝑥, 𝑦) and 𝑐(𝑥, 𝑦), we use the least-squares method.…”

Section: Introductionmentioning

confidence: 99%

Fringe projection profilometry for recovering 2.5D shape of ancient coins

2021

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<p class="Abstract">The relief of form is undoubtedly one of the most topical topics in the field of cultural heritage. Physical access to historic and artistic manufactures can be limited by a lot of factors. For example, the access to the collection of the ancient coins is difficult, especially for students. Indeed, for coins digital archive of high-quality three-dimensional model and remote fruition is of great interest. The use of projected fringes for the measurement of surface profile is a well-developed technique. In this paper, we present a surface profile measurement system for small objects of cultural heritage where it is important not only to detect the shape with good accuracy but also to capture and archive the signs due to ageing. The illustrated equipment is simple, reliable, and cheap. Furthermore, some examples of acquisitions are presented to demonstrate the potentiality of the proposed scheme for recovering 2.5D shape of cultural heritage objects.</p>

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Calibration of a fringe projection profilometry system using virtual phase calibrating model planes

Cited by 38 publications

References 22 publications

Tracking the free surface of time-dependent flows: image processing for the dam-break problem

Tracking the free surface of time-dependent flows: image processing for the dam-break problem

A dual-frequency fringe projection three-dimensional shape measurement system using a DLP 3D projector

Fringe projection profilometry for recovering 2.5D shape of ancient coins

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