Double-pattern triangular pulse width modulation technique for high-accuracy high-speed 3D shape measurement

Wang, Yajun; Jiang, Chufan; Zhang, Song

doi:10.1364/oe.25.030177

Cited by 24 publications

(8 citation statements)

References 18 publications

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“…For high-accuracy applications, interferometry-based [2][3][4] and structure-light-based [5][6][7][8] techniques are commonly employed. However, in scenarios where accuracy is not the primary concern and field of view (FOV) and range are more critical, ToF-based surface measurement technique can be more appealing.…”

Section: Introductionmentioning

confidence: 99%

Cylinder diameter measurement with iPhone embedded LiDAR and RGB sensors

Wang

Fei

Zhang

2023

Dimensional Optical Metrology and Inspection for Practical Applications XII

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This paper presents a novel method for measuring the size of standard cylinders with the LiDAR and RGB sensors embedded with iPhones. First, we reconstruct 3D points of cylindrical surfaces using the LiDAR data. With 3D point cloud data, we fit the orientation of the cylinder with center pixels. Since the LiDAR does not offer 3D points with high resolution nor high accuracy, we select a segment of the point cloud data and compute the average depth of these segment pixels as the distance from the cylinder to the camera. We then compute the diameter by the geometric relationship of each point on the cylinder. Finally, we improve the measurement accuracy by applying a estimation function. Experimental results show that at distances from 0.3 m to 2 m with different tilt angles, the proposed method can achieve 3 cm cylinder diameter measurement accuracy for the cylinders with a diameter of 8 cm and 14 cm, and 5 cm accuracy for the cylinder with a diameter of 22 cm.

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Section: Introductionmentioning

confidence: 99%

Cylinder diameter measurement with iPhone embedded LiDAR and RGB sensors

Wang

Fei

Zhang

2023

Dimensional Optical Metrology and Inspection for Practical Applications XII

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“…As opposed to FTP, PMP exhibits a lower speed but a higher measuring accuracy, a wider range of heights of measuring object, less effect by different reflectivity values on object surface, and less effect exerted by drastic variations or fractures on object surface [ 15 , 16 ]. The modern 3D measurement is committed to investigating a higher measuring speed, higher measuring accuracy, as well as a wider measurement application range; thus, PMP is recognized as a more effective choice [ 17 – 21 ].…”

Section: Introductionmentioning

confidence: 99%

Real-time profilometry by bicolor grating video projection

Zhang

Cao

et al. 2021

PLoS ONE

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A novel real-time 2+1 three-dimensional(3D) measuring method based on bicolor grating video projection is proposed. Firstly, only two frames of bicolor gratings, in which the red channels are two sinusoidal fringes with a shifting phase of π/2 and the blue channels are the same background light equivalent to the DC component of the two sinusoidal fringes are encoded and arranged alternatively to synthesize into a repetitive bicolor grating video, While this video is projected onto the measured object, the real-time bicolor deformed pattern video can be recorded by using a color CMOS camera, and the bicolor deformed pattern sequence at different moments can be extracted by computer processing, so that the 2+1 algorithm can be used to accomplish real-time 3D measurement of moving object. Before measuring, we used the same method to design two sinusoidal fringes with a difference of π in their red channels, respectively, to calibrate the sensitivity ratio between the red and blue channels of the CMOS camera, which can effectively eliminate the chromaticity imbalance between R and B channels and reduce the color crosstalk. Experimental results and analysis confirm the feasibility and effectiveness of the proposed method. Because the proposed method needs a repetitive bicolor grating video synthesized with only two-frame bicolor gratings to be projected, the 3D measurement acquisition speed and real-time accuracy will be improved compared with the traditional 2+1 3D measuring method.

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“…[5] The binary defocusing techniques have been developed to break the speed bottleneck. [1,6,7] Moreover, nonlinear gamma can be eliminated automatically with 1-bit depth patterns. However, some additional issues are present and need handling: (i) the smaller depth range and (ii) the high-order harmonic error.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective strategy to optimize dithering technique for high-quality three-dimensional shape measurement*

Cai¹,

Chen²,

Cao

et al. 2019

Chinese Phys. B

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Dithering optimization techniques can be divided into the phase-optimized technique and the intensity-optimized technique. The problem with the former is the poor sensitivity to various defocusing amounts, and the problem with the latter is that it cannot enhance phase quality directly nor efficiently. In this paper, we present a multi-objective optimization framework for three-dimensional (3D) measurement by utilizing binary defocusing technique. Moreover, a binary patch optimization technique is used to solve the time-consuming issue of genetic algorithm. It is demonstrated that the presented technique consistently obtains significant phase performance improvement under various defocusing amounts.

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Double-pattern triangular pulse width modulation technique for high-accuracy high-speed 3D shape measurement

Cited by 24 publications

References 18 publications

Cylinder diameter measurement with iPhone embedded LiDAR and RGB sensors

Cylinder diameter measurement with iPhone embedded LiDAR and RGB sensors

Real-time profilometry by bicolor grating video projection

Multi-objective strategy to optimize dithering technique for high-quality three-dimensional shape measurement*

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