Real-time full-field 3-D surface-shape measurement using off-the-shelf components and a single processor

Jia, Peirong; Kofman, Jonathan; English, Chad

doi:10.1109/3dim.2007.43

Cited by 5 publications

(5 citation statements)

References 32 publications

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“…Since the proposed technique is based on the projection of binary patterns instead of gray levels intensities, it is possible to expand the operating tolerance to ambient light and avoid camera sensor saturation. We also show that is not necessary the use of phase unwrapping, as proposed in [6][7][8][9][10][11][12] for recovering the unwrapped intensity-ratio map. Finally, we have demonstrated that the periodic measurement errors due to gamma nonlinearity and defocus of the projector and camera are eliminated with the proposed method.…”

Section: Resultsmentioning

confidence: 94%

“…An alternative procedure to the projection of sinusoidal fringes consists in projecting two consecutive patterns on the test surface; a constant illumination pattern and a linear gray-level pattern (along the x axis) or equivalently, a triangular pattern onto the object [5][6][7][8][9][10][11][12]. Then, the 3-D profile is calculated as a simple intensity ratio between the two patterns.…”

Section: Introductionmentioning

confidence: 99%

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Binary coded triangular fringes for 3-D surface-shape measurement

et al. 2013

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We present a method for synthesizing triangular intensity fringes as a way to solve the problems caused by projector/camera gamma nonlinearity in triangular-pattern phase-shifting profilometry. The fringe generation technique consists of projecting and acquiring a temporal sequence of strictly binary color patterns (code gray), whose (adequately weighted) average leads to triangular fringe patterns with the required number of bits, which allows a reliable three-dimensional profile reconstruction using these methods. Validation experiments are presented.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Binary coded triangular fringes for 3-D surface-shape measurement

et al. 2013

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“…With high-speed digital projection of fringe patterns, phase-shifting techniques can achieve realtime measurement [1], [2] using off-the-shelf components [3]. High frame rates were achieved by Zhang and Huang [4] by removing the color filter from the projector [5] and synchronizing a high speed camera with the projector.…”

Section: Introductionmentioning

confidence: 99%

“…Fringe-patterns of periodic varying light intensity with known phase shift are sequentially projected onto the object surface. Trapezoidal [8], [9] triangular [10], [3] and more commonly sinusoidal patterns have been used. The sinusoidal pattern, used in this paper, can be expressed as follows [11]:…”

Section: Introductionmentioning

confidence: 99%

Saturation avoidance by adaptive fringe projection in phase-shifting 3D surface-shape measurement

Waddington

Kofman

2010

2010 International Symposium on Optomechatronic Technologies

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Fringe-pattern projection systems are capable of non-contacting 3D surface full-field measurement with high accuracy. However, the systems are prone to intensity saturation and low signal-to-noise ratio (SNR) when measuring objects with a large range of reflectivity across the surface. Intensity saturation occurs when the light intensity directed to the camera exceeds the maximum intensity quantization level. A low SNR occurs when there is a low intensity modulation compared to the amount of noise in the image. Saturation and low SNR can result in significant measurement error. This paper presents a method for saturation avoidance during object-surface measurement, by adaptively adjusting the projected fringe-pattern intensities, through the maximum input gray level (MIGL). A high SNR can be maintained while avoiding saturation by combining the intensities from phase-shifted images captured at different MIGL, into a set of composite phase-shifted images. In measurement of a black and white checkerboard at different depths, the newly developed method reduced errors by an average 0.25 mm compared to the highest accuracy measurement using a uniform MIGL.

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“…The applied equipment is normally based on a fixed triangulation base between camera system and light projector [4] while the object is statically placed and resolution is limited to the field of view (FOV). An application using industrial components is described in [11]. When dealing with a cost efficient and high resolution measuring system current systems do not fulfill the wide range of requirements resulting from [17].…”

Section: Introductionmentioning

confidence: 99%

Conceptual design and analysis of an on-line opto-mechatronic measuring system based on pattern projection

Drust

Verl

2011

2011 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)

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In this paper, an approach for an opto-mechatronic 6-D measuring system for machining with industrial robots is proposed. The conceptual design of the system MatrixTraq which is based on pattern projection in the workspace of a robot system is explained. Realization aspects and the spatial configuration of main components incorporating a light emitting device just as a sensing device are outlined. A simplified test bed used for the evaluation of the conceptual approach is described. Industrial equipment is used and computation methods for ellipse detection are implemented to address practical issues. Experimental results for capturing and reconstructing light projections for a robot moving in-plane are presented and compared

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Real-time full-field 3-D surface-shape measurement using off-the-shelf components and a single processor

Cited by 5 publications

References 32 publications

Binary coded triangular fringes for 3-D surface-shape measurement

Binary coded triangular fringes for 3-D surface-shape measurement

Saturation avoidance by adaptive fringe projection in phase-shifting 3D surface-shape measurement

Conceptual design and analysis of an on-line opto-mechatronic measuring system based on pattern projection

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