Abstract
Color crosstalk is challenging for color fringe projection profilometry, which will cause color imbalance and phase-shift deviation, thus resulting in phase error. To address this challenge, this paper presents a blind crosstalk correction method for color phase-shifting fringe projection profilometry without crosstalk calibration. Three channels of the color fringe are firstly normalized to resolve color imbalance. The phase error induced by phase-shift deviation between three channels doubles the frequency of the color fringe. Therefore, the original cosine color fringe is shifted by quarter period to generate another sine color fringe to compensate the periodic phase error. Both simulations and experiments were carried out, and their results confirmed the effectiveness and accuracy of the proposed method.
Highlights
Fringe projection profilometry (FPP) based on triangulation principle is one of the most commonly used methods in optical three-dimensional (3D) shape measurement due to its low cost, fast speed, and high-resolution capabilities [1,2,3,4,5,6]
The fringe patterns should be designed and generated by the computer. These patterns are projected onto the measured objects by the projector; at the same time, the deformed patterns are recorded by the camera. These captured images are transferred to the computer and analyzed by phase extraction algorithms to obtain the geometric information of the measured objects [7]
We present a blind crosstalk correction method for color phase-shifting fringe projection profilometry
Summary
Fringe projection profilometry (FPP) based on triangulation principle is one of the most commonly used methods in optical three-dimensional (3D) shape measurement due to its low cost, fast speed, and high-resolution capabilities [1,2,3,4,5,6]. The fringe patterns should be designed and generated by the computer These patterns are projected onto the measured objects by the projector; at the same time, the deformed patterns are recorded by the camera. PSP is the most popular method, because it can achieve pixel-wise phase extraction, which can reconstruct the measured objects with abrupt changes more robustly It generally requires more fringe patterns (normally at least three) than transform methods [11]. To suppress the phase error caused by color crosstalk, Huang et al [23] proposed a method to compensate the coupling effects between channels. Journal of Sensors fringe patterns onto a white-painted flat board to calculate the degrees of coupling effects between three channels and compensated it This method has been explored when different numbers of fringes are projected on each channel by Zhang [24].
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