Dynamic 3-D Measurement Based on Temporal Fringe Order Recognition

Wu, Haitao; Cao, Yiping; Dai, Yongbo; Li, Hongmei

doi:10.1109/tim.2023.3318738

Cited by 4 publications

(1 citation statement)

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“…Wu et al [23] proposed a special spatial binary code, which only needs to add an auxiliary pattern to achieve decoding of the fringe order. Moreover, the temporal fringe order recognition method was proposed in [24], which only requires three phase-shifting patterns to obtain phase expansion. To overcome the shortcomings of spatial phase unwrapping methods, temporal phase unwrapping methods have been proposed to achieve phase unwrapping by projecting additional patterns.…”

Section: Introductionmentioning

confidence: 99%

Three 1-bit speckle-embedded pulse-width modulation patterns for robust absolute 3D measurement

Zheng,

Li,

Zuo

et al. 2024

Meas. Sci. Technol.

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In 3D shape measurement techniques using structured light, 1-bit pulse-width modulation (PWM) patterns and 1-bit speckle patterns can be projected at high speed. However, when combining PWM and speckle patterns to integrate their advantages, the decoupling problem is insurmountable. In this work, a novel 1-bit speckle-embedded pulse-width-modulation (SP-PWM) patterns was proposed to achieve absolute 3D shape measurement using only three binary patterns. Our method consists of three main steps: First, a sinusoidal pattern reconstruction network (SPRNet) was proposed to eliminate the high-order harmonics and speckle patterns in the SP-PWM patterns and obtain high-quality sinusoidal patterns. Second, a multi-temporal spatial correlation matching algorithm (MTSCMA) was proposed to obtain a coarse disparity map from the three SP-PWM patterns. Third, the high-accuracy wrapped phase map is used as an additional constraint for refining the coarse disparity map to obtain the final high-accuracy disparity map for absolute 3D measurement without phase unwrapping. Our method combines the advantages of fringe projection profilometry techniques for high-precision wrapped phase retrieval and speckle correlation matching algorithms for robust and unambiguous disparity map calculation. The experimental results demonstrated that our method could realize high-precision absolute 3D shape measurement with an accuracy of 0.057mm using only three 1-bit SP-PWM patterns. Furthermore, different simulation noises were used to demonstrate the robustness of the proposed method.

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Section: Introductionmentioning

confidence: 99%