Shadow moire´ profilometry using the phase-shifting method

Jin, Lianhua; Kodera, Yutaka; Yoshizawa, Tôru; Otani, Yukitoshi

doi:10.1117/1.1305468

Cited by 50 publications

(23 citation statements)

References 7 publications

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“…This method is simple in its implementation however requires phase unwrapping which can be prone to errors, particularly in the presence of noise [3]. 3-Phase Shift Profilometry is a popular technique for 3D shape estimation due to its simplicity of implementation and high level of detail in the resultant phase maps [4,5]. Phase shifting interferometry is where a number of fringe patterns are projected on the object at a phase shift increment of 2π/n (n=the number of images being projected).…”

Section: Introductionmentioning

confidence: 99%

Multiview 3D profilometry using resonance-based decomposition and three-phase shift profilometry

Woolford

Burnett

2015

SPIE Proceedings

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In this paper a one-shot method to determine the shape of an object from overlapping cosine fringes projected from multiple projectors is presented. This overcomes the limitation with single projector systems that do not allow imaging the entire object with a single shot. This research projects orthogonal grey scale sinusoidal fringes simultaneously onto an object and separates them using resonance decomposition. Resonance decomposition is a method that separates signals based on the idea of resonance, whether or not a signal exhibits a high degree of sustained oscillation, and can separate high and low resonance components of a signal even if they overlap in the frequency domain. In addition to pattern separation a novel method of phase error compensation is proposed using the mean value for each period ranging from -, as the basis for a look up table (LUT). It is shown that this method of error compensation is able to reduce the error caused by non-sinusoidal waveforms to a level comparable to the single view 3-phase shift profilometry method.

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Section: Introductionmentioning

confidence: 99%

Multiview 3D profilometry using resonance-based decomposition and three-phase shift profilometry

Woolford

Burnett

2015

SPIE Proceedings

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“…The low resolution and nonquantitative in conventional geometric moiré is the main reason why the method is used but little for measurement of displacement and strain. To improve the low resolution of moiré fringe, phase-shifting method [21][22][23] is introduced. However, these methods cannot be applied to dynamic phenomenon measurement because it requires movement of the reference grating (phase-shifting) and capturing the specimen grating more than three or four images.…”

Section: Introductionmentioning

confidence: 99%

Sampling Moiré Method for Accurate Small Deformation Distribution Measurement

2009

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In this paper, a novel accurate deformation distribution measurement technique by using sampling moiré method is proposed. The basic principle and an experimental result of a steel beam in symmetric three-point bending are reported. In this method, the measurement area of a target is attached with an adhesive tape of a known pitch grating firstly. An ordinary CCD camera is installed on a fixed point to record the image during deformation. The captured image is analyzed by performing easy image processing, i.e., thinning-out and linear interpolation, to obtain the multiple phase-shifted moiré patterns. Then, the phase distribution of the moiré pattern can be calculated using phase-shifting method. Finally, the deformation distribution is calculated by the grating pitch times the phase difference of before deformation and after deformation. The experimental results in symmetric three-point bending test show that the displacement of the steel beam at loading point agree well with those obtained by an accurate displacement sensor. The average error of displacement measurement is less than 4 μm when 2 mm grating pitch is used, and it corresponds to 1/500 of the grating pitch accuracy. This indicates that noncontact deformation distribution measurement is possible by simple and easy procedure with high accuracy, high speed, and low cost for the structural evaluation of infrastructures.

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“…In phase-shifted fringe projection technique [9][10][11][12] several, normally four, sinusoidal fringe patterns with prescribed phase steps are projected onto the surface of an object. The phase distribution of an object surface is modulated by a projected fringe pattern and normally appears as fringe distortion.…”

Section: Introductionmentioning

confidence: 99%