Fast and accurate 3D topography measurement based on a novel synthesis pattern method

Zheng, Renhao; wan, maosen; Wei, Zhang; Yu, Liandong

doi:10.1088/1361-6501/aca819

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…In the proposed method, as the binary lines are evenly spaced in the projector pattern, the maximum value of the relative projector coordinate, ∆v, will be restricted by the distance between two adjacent lines. Just like the wrapped phase map in the phase-shifting method [4], the relative projector coordinates ∆v (x and y) also can be converted into the absolute projector coordinate v (x and y) using the phase-unwrapping method [20]:…”

Section: Determining the Projector Coordinate With A Time-domain Gaus...mentioning

confidence: 99%

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Fast Three-Dimensional Profilometry with Large Depth of Field

Zhang,

Zhu,

Han

et al. 2024

Sensors

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By applying a high projection rate, the binary defocusing technique can dramatically increase 3D imaging speed. However, existing methods are sensitive to the varied defocusing degree, and have limited depth of field (DoF). To this end, a time–domain Gaussian fitting method is proposed in this paper. The concept of a time–domain Gaussian curve is firstly put forward, and the procedure of determining projector coordinates with a time–domain Gaussian curve is illustrated in detail. The neural network technique is applied to rapidly compute peak positions of time-domain Gaussian curves. Relying on the computing power of the neural network, the proposed method can reduce the computing time greatly. The binary defocusing technique can be combined with the neural network, and fast 3D profilometry with a large depth of field is achieved. Moreover, because the time–domain Gaussian curve is extracted from individual image pixel, it will not deform according to a complex surface, so the proposed method is also suitable for measuring a complex surface. It is demonstrated by the experiment results that our proposed method can extends the system DoF by five times, and both the data acquisition time and computing time can be reduced to less than 35 ms.

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Section: Determining the Projector Coordinate With A Time-domain Gaus...mentioning

confidence: 99%

“…In conventional FPP system, a set of 8-bit sinusoidal patterns will be projected onto the object surface. As an 8-bit gray pattern has limited projection rate (within 120 Hz), the measurement speed of FPP system is thus restricted [4].…”

Section: Introductionmentioning

confidence: 99%

Fast Three-Dimensional Profilometry with Large Depth of Field

Zhang,

Zhu,

Han

et al. 2024

Sensors

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“…This method uses fringes with only two light intensity values, 0 and 255, to eliminate the nonlinear effects of the projection system and avoid the need for defocusing adjustment of the projector. Zheng et al [13] attempted to encode multiple binary images and superimpose them to form a triangular fringe pattern. Yan et al [14] encoded binary fringes based on the intensity values within one cycle of the sinusoidal fringe and then synthesized sinusoidal fringes.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional measurement based on equal spacing binary fringe coding

Yan,

Wu,

Sun

et al. 2024

Meas. Sci. Technol.

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Binary fringe projection technology can effectively avoid the measurement error caused by nonlinearity in structured light three-dimensional measurement system. In this paper, a binary fringe projection coding based on equal spacing is proposed Firstly, the image sequence projected by binary fringes with equal spacing is corresponding to the sinusoidal intensity values in the same period one by one, and then the sinusoidal fringes are generated by weighted superposition. The experimental results show that, compared with the traditional four-step and 12-step phase shifting methods, the mean square error of the synthesized sinusoidal pattern is reduced by 36.74% and 18.24% respectively, and the mean square error of the distance between the obtained spherical point cloud of the standard sphere and the center of the fitting standard sphere is reduced by 89.36% and 77.27% respectively.

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Fast and accurate 3D topography measurement based on a novel synthesis pattern method

Cited by 2 publications

References 14 publications

Fast Three-Dimensional Profilometry with Large Depth of Field

Fast Three-Dimensional Profilometry with Large Depth of Field

Three-dimensional measurement based on equal spacing binary fringe coding

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