Dynamic 3D surface profilometry using a novel colour pattern encoded with a multiple triangular model

Chen, L C; Nguyen, Xuan Loc

doi:10.1088/0957-0233/21/5/054009

Cited by 20 publications

(6 citation statements)

References 19 publications

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“…Stereo vision is the most popular vision technology for 3D measurement based on 2D stereoscopic images [21]. Stereo vision can be categorized as active and passive vision systems, which respectively operate with or without active illumination of the workpiece surface.…”

Section: On-machine 3d Surface Visionmentioning

confidence: 99%

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On-machine and in-process surface metrology for precision manufacturing

et al. 2019

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On-machine and in-process surface metrology are important for quality control in manufacturing of precision surfaces. The classifications, requirements and tasks of on-machine and in-process surface metrology are addressed. The state-of-the-art on-machine and in-process measurement systems and sensor technologies are presented. Error separation algorithms for removing machine tool errors, which is specially required in on-machine and in-process surface metrology, are overviewed, followed by a discussion on calibration and traceability. Advanced techniques on sampling strategies, measurement systems-machine tools interface, data flow and analysis as well as feedbacks for compensation manufacturing are then demonstrated. Future challenges and developing trends are also discussed.

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Section: On-machine 3d Surface Visionmentioning

confidence: 99%

“…A distorted image of the projected structured light pattern, corresponding to the 3D surface topography, is formed at the image plane of the camera. The 3D surface topography can be reconstructed from single-or multi-shot techniques [21], based on the same triangulation principle as in Fig. 13.…”

Section: Active Stereo Vision (Fringe Projection)mentioning

confidence: 99%

On-machine and in-process surface metrology for precision manufacturing

et al. 2019

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“…Because of the patterns and image as the fringe, PSP named as Fringe Projection Profilometry (FPP). Compared to other optical measurement methods, FPP, based on digital patterns-projection, unwrapped phase computation, and phase-shifting profilometry, and has the advantage of high resolution, high measurement speed; less sensitive to the surface reflectivity variations and the object can be measured point by point [5][6].…”

Section: Introductionmentioning

confidence: 99%

Gamma Calibration and Phase Error Compensation for Phase Shifting Profilometry

Yang

Feng²,

Jiang³

et al. 2014

IJMUE

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Phase Shifting Profilometry is a method of structured light whose three-dimensional reconstructions are susceptible to error from Gamma distortion. In practice, the luminance nonlinearity caused by the Gamma distortion effect of a digital video projector and a digital camera yields undesired fringe intensity changes, which substantially reduce the measurement accuracy, and while the effects of the Gamma distortion diminish with an increasing number of employed phase-shifting patterns. A Gamma calibration method expressed as Fourier series and binomial series theorem is proposed to reduce the measurement error caused by the Gamma distortion. After Gamma calibration, the Gamma distortion effect is attenuated and the accuracy is enhanced. The linear least square is compensated the phase error of absolute phase still existing after Gamma calibration. To verify the presented method in this paper, a profilometry experimental system is constructed using digital video projector and CCD camera. The experiment results shown that, the Gamma calibration reduce the maximum phase error of absolute phase by 75.0%. After the linear least square compensation, the maximum phase error is only 5.9% of without any Gamma calibration or phase compensation. The reconstruction surface of a complex curve surface is hardly any waviness, which is clearly noted in the reconstruction of the same tested object without any correction or compensation.

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“…However, due to the use of multiple-fringe images required for phase calculation, the existing methods are limited in terms of real-time measurement and prone to troublesome errors caused by unavoidable environmental vibration or other external disturbances. To increase the speed of image acquisition, a novel colour pattern encoded with a multiple triangular model was developed for achieving one-shot 3D imaging [7]. Differently from phase shifting, colour structured-light encoding methods employ a structured pattern encoded by multiple colour stripes to be projected onto the object's surface [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

High-speed Fourier transform profilometry for reconstructing objects having arbitrary surface colours

Chen¹,

Nguyen²,

Zhang³

et al. 2010

J. Opt.

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In this paper, Fourier transform profilometry (FTP) using a colour fringe selection technique for accurate phase map reconstruction is newly proposed to overcome the limitation of FTP in measuring objects having arbitrary surface colours. The sinusoidal colour fringe pattern is encoded to form a unique colour pattern for projecting onto the object’s surface, and its reflected deformed fringe image is taken using a triple-colour CCD camera and rapidly processed by the developed FTP method employing a novel band-pass filter. A new 3D vision system is capable of measuring objects with a high speed of up to 60 frames s − 1. To reconstruct the 3D profile of an object having arbitrary surface colours, an innovative strategy is developed to identify the colour channel of the detected fringe pattern with the best modulation transfer function (MTF) for retrieving accurate phase maps. The experimental results demonstrate that the system has the capability to acquire 3D maps at a high speed while the measurement accuracy of the developed method is substantially better than that of the traditional FTP method. By measuring the standard step heights in a repeatability test, it is confirmed that a maximum measured error can be controlled to less than 2.8% of the overall measuring depth range.

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Dynamic 3D surface profilometry using a novel colour pattern encoded with a multiple triangular model

Cited by 20 publications

References 19 publications

On-machine and in-process surface metrology for precision manufacturing

On-machine and in-process surface metrology for precision manufacturing

Gamma Calibration and Phase Error Compensation for Phase Shifting Profilometry

High-speed Fourier transform profilometry for reconstructing objects having arbitrary surface colours

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