Flexible 3-D shape measurement using projector defocusing

Lei, Shuangyan; Zhang, Song

doi:10.1364/ol.34.003080

Cited by 367 publications

(185 citation statements)

References 14 publications

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“…In addition, the sinusoid patterns can be generated by several means. For example, a commercial digital projector displays the patterns in 24-bit mode; a programmable digital micromirror device (DMD) that displays the patterns in binary mode, and the defocusing 17 or the spatial filtering approach 16 is employed to make the resulting patterns sinusoidal; two coherent plane waves intersect at an angle to form a sinusoid pattern. What is more, the technique presented here is a compressive sampling 4,[8][9][10]12,13 like approach.…”

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confidence: 99%

Single-pixel imaging by means of Fourier spectrum acquisition

2015

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Single-pixel imaging techniques enable to capture a scene without a direct line of sight to the object, but high-quality imaging has been proven challenging especially in the presence of noisy environmental illumination. Here we present a single-pixel imaging technique that can achieve high-quality images by acquiring their Fourier spectrum. We use phase-shifting sinusoid structured illumination for the spectrum acquisition. Applying inverse Fourier transform to the obtained spectrum yields the desired image. The proposed technique is capable of capturing a scene without a direct view of it. Thus, it enables a feasible placement of detectors, only if the detectors can collect the light signals from the scene. The technique is also a compressive sampling like approach, so it can reconstruct an image from sub-Nyquist measurements. We experimentally obtain clear images by utilizing a detector not placed in direct view of the imaged scene even with noise introduced by environmental illuminations.

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confidence: 99%

Single-pixel imaging by means of Fourier spectrum acquisition

2015

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“…Although the TI [4] (Texas Instruments) can solve the above problems, its high equipment cost prevents its wide application; the other one is DBP(defocusing binary patterns),namely the method of getting sinusoidal pattern by defocusing the binary pattern. It doesn't have a projector's nonlinear gamma problem, does not need complex devices to generate sinusoidal pattern, and he no synchronization problems and the demanding of exposure time between FSP cameras and projectors does not exist.…”

Section: The Camera Exposure Time Demandsmentioning

confidence: 99%

The Method of Design Sine Grating based on Suboptimal PWM

Fu¹

2015

TOCSJ

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Abstract:In the structured light 3 d optical measurement field, the sinusoidal grating design is one of the research focuses. The traditional focus methods of generating sine pattern is not widely accepted because of many well known defects. While another traditional binary pattern generated from Ronchi grating needs defocusing processing, its application has also been a certain limit because of its projected pattern contrast ratio is not high.In this paper, we have proposed a designing sine grating method with the spatial modulation theory based on Suboptimal PWM in electronic engineering. Compared with Ronchi grating, this method of generating pattern has a better fringe contrast, and more simple defocusing requirements, so this method has a good practical economic value.

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“…For a five-step phase-shifting algorithm with a phase shift of 2π ∕5, the fringe patterns can be described as I n x; y I 0 x; y I 00 x; y cosϕ 2πn ∕5; (1) where n 1; 2; …; 5, I 0 x; y is the average intensity, I 00 x; y is the intensity modulation, and ϕx; y is the phase to be solved for using the following equation:…”

Section: Phase-shifting Algorithmmentioning

confidence: 99%

“…The recently proposed binary defocusing technique [1] and its variations [2,3] have demonstrated their superiorities over conventional sinusoidal fringe projection techniques for three-dimensional (3D) shape measurement. Yet, it is very difficult for them to produce high-quality 3D shape measurement when the fringe stripes are wide and when the projector is nearly focused [4].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional shape measurement with binary dithered patterns

2012

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The previously proposed binary defocusing technique and its variations have proven successful for highquality three-dimensional (3D) shape measurement when fringe stripes are relatively narrow, but they suffer if fringe stripes are wide. This paper proposes to utilize the binary dithering technique to conquer this challenge. Both simulation and experimental results show the phase error is always less than 0.6% even when the fringe stripes are wide and the projector is nearly focused. Disciplines Computer-Aided Engineering and Design | Mechanical Engineering CommentsThis article is from Applied Optics 51 (2012) The previously proposed binary defocusing technique and its variations have proven successful for high-quality three-dimensional (3D) shape measurement when fringe stripes are relatively narrow, but they suffer if fringe stripes are wide. This paper proposes to utilize the binary dithering technique to conquer this challenge. Both simulation and experimental results show the phase error is always less than 0.6% even when the fringe stripes are wide and the projector is nearly focused.

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Flexible 3-D shape measurement using projector defocusing

Cited by 367 publications

References 14 publications

Single-pixel imaging by means of Fourier spectrum acquisition

Single-pixel imaging by means of Fourier spectrum acquisition

The Method of Design Sine Grating based on Suboptimal PWM

Three-dimensional shape measurement with binary dithered patterns

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