Absolute three-dimensional shape measurement using coded fringe patterns without phase unwrapping or projector calibration

Lohry, William; Chen, Vincent; Zhang, Song

doi:10.1364/oe.22.001287

Cited by 85 publications

(39 citation statements)

References 65 publications

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“…It determines the phase of the test object following two steps: first, it derives two partial derivatives of the desired phase from the fringe patterns, and then it reconstructs the phase by the line integral of the two partial derivatives. Different from the method by reference [28][29][30][31][32][33], it transforms the direct integration of the spatial derivatives to solve Poission's equation. However, Perciante's method has a single prerequisite that the phase of the tested object is continuous.…”

Section: Introductionmentioning

confidence: 99%

Robust wrapping-free phase retrieval method based on weighted least squares method

Wang

Zhou

et al. 2017

Optics and Lasers in Engineering

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For many profilometry techniques, phase unwrapping is one of the most challenging process. In order to sidestep the phase unwrapping process, Perciante et. al [Appl Opt 2015; 54(10):3018-23] proposed a wrapping-free method based on the direct integration of the spatial derivatives of the patterns to retrieve the phase. But it is only applicable for the case of the phase continuity for the tested object, which means it may fail to handle fringe patterns containing complicated singularities, such as noise, shadow, shears and surface discontinuity. In view of this problems, a robust wrapping-free phase retrieval method is proposed in this paper, which is based on combined Perciante's method and weighted least-squares method. Two partial derivatives of the desired phase is obtained from the fringe patterns, meanwhile the carrier is eliminated using direct phase difference method. The phase singularities are determined using derivative variance correlation map (DVCM), and the weighting coefficient is obtained from the binary mask of the reverse DVCM. Simulations and experiments are conducted to prove the validity of the proposed method. Results are analyzed and compared with those of Perciante's method, demonstrating that the proposed method can be available for measuring objects with some kinds of singularities sources.

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Section: Introductionmentioning

confidence: 99%

Robust wrapping-free phase retrieval method based on weighted least squares method

Wang

Zhou

et al. 2017

Optics and Lasers in Engineering

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“…[11][12][13][14][15][16] The methods of using more than one camera [2][3][4] can effectively reduce the motion induced error by introducing another camera. This is owing to the fact that any motion artifacts within the phase data would appear in each of the two synchronized cameras, and thus it won't affect the detection of correspondence.…”

Section: Introductionmentioning

confidence: 99%

Motion artifact reduction using hybrid Fourier transform with phase-shifting methods

Liu

Zhang

2016

SPIE Proceedings

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We propose to combine the Fourier transform profilometry (FTP) and phase-shifting profilometry (PSP) to reduce motion induced artifacts. The proposed method can be divided into three steps:Step 1 is to obtain a temporarily unwrapped absolute phase map of the entire scene using the FTP method, albeit the absolute phase map has motion introduced artifacts;Step 2 is to generate continuous relative phase maps without motion artifacts for each isolated object by spatially unwrapping each isolated phase map retrieved from the FTP method; andStep 3 is to determine the absolute phase map for each isolate region by referring to the temporally unwrapped phase using PSP method. Experimental results demonstrated success of the proposed method for measuring rapidly moving multiple isolated objects.

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“…Moreover, the PSP is less sensitive to the surface reflectivity variations and the object can be measured on pixel-by-pixel basis. With PSP, multiple fringe stripes [6] with the same wavelength are usually utilized. However, the phase maps retrieved are wrapped ones, which must be unwrapped for 3D shape recovery.…”

Section: Introductionmentioning

confidence: 99%

Phase unwrapping method based on multiple fringe patterns without use of equivalent wavelengths

Song

Chang

et al. 2015

Optics Communications

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In order to decrease the noise enhancement in the process of phase unwrapping, we present a new phase unwrapping approach for multiple wavelength phase shift profilometry. In this approach, a series of fringe images with only three wavelengths are captured by the 3D measurement system, and it does not need to calculate the equivalent wavelengths and the equivalent phases. As a result, the noise enhancement is avoided, leading to improved precision in the absolute phase map recovery. Experiment results demonstrate that the proposed method is more robust and effective compared to the existing TWPSP method. AbstractIn order to decrease the noise enhancement in the process of phase unwrapping, we present a new phase unwrapping approach for multiple wavelength phase shift profilometry. In this approach, a series of fringe images with only three wavelengths are captured by the 3D measurement system, and it does not need to calculate the equivalent wavelengths and the equivalent phases. As a result, the noise enhancement is avoided, leading to improved precision in the absolute phase map recovery.Experiment results demonstrate that the proposed method is more robust and effective compared to the existing TWPSP method.

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Absolute three-dimensional shape measurement using coded fringe patterns without phase unwrapping or projector calibration

Cited by 85 publications

References 65 publications

Robust wrapping-free phase retrieval method based on weighted least squares method

Robust wrapping-free phase retrieval method based on weighted least squares method

Motion artifact reduction using hybrid Fourier transform with phase-shifting methods

Phase unwrapping method based on multiple fringe patterns without use of equivalent wavelengths

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