Neural network based color decoupling technique for color fringe profilometry

Rao, Li; Da, Feipeng

doi:10.1016/j.optlastec.2015.01.007

Cited by 15 publications

(7 citation statements)

References 22 publications

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“…Alternatively, Color Digital Fringe Pattern Profilometry (CDFPP) has been proposed as an alternative for a fast measurement technique and preserving PSP's advantage [17]- [20]. Using CDFPP is possible to apply PSP by only projecting a single frame of a pattern.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, deliberate fabrication is rather unfortunate for measurement purposes through CDFPP. Several arising problems from the nonlinearity of projector and camera, color coupling, and color imbalance need to be tackled in CDFPP [18], [20]. These problems make image decoupling of a recorded color fringe pattern from each color channel hard to complete correctly and contribute hugely to phase error.…”

Section: Introductionmentioning

confidence: 99%

“…Many approaches have been proposed to solve these drawbacks of color fringe utilization. A scheme based on artificial neural networks (ANN) has been presented as a nonlinear mapping to normalize fringe patterns from each color channel [20], [22]. However, an optimal mapping function depends on some strict assumptions about the training process of ANN.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Phase Error Suppression Concerning 3D surface Deformation Measurement on Color Digital Fringe Projection Profilometry

Suprijanto¹,

Zahra²,

Nadhira³

et al. 2022

Int. J. Adv. Sci. Eng. Inf. Technol.

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3D surface measurement based on phase-shifting profilometry (PSP) has been actively developed in recent years. Three color channels of RGB that are modulated to generate a one-shot PSP method is a concept of color digital fringe pattern profilometry (CDFPP). The CDFPP is a promising technique for the 3D imaging profile of dynamic surface deformation if several phase errors in the one-shot PSP method can be suppressed. This work proposes a processing scheme for phase error suppression schemes (PESS) based on retrieving the modulated sinusoidal fringe and color fringe normalization in PSP using RGB color channel. The processing of PESS consists of tunable bandpass filtering (BPF) followed by fringe normalization. The initial BPF function is defined based on a smoothing spline data set of frequency and power spectrum from the baseline color fringe image. The predefine BPF function could be tunable during the imaging process by considering each frame's condition and RGB channel spectrum mapping. The corrected fringe images are then normalized from the color imbalance, and the phase shift is calculated using the conventional three-step PSP. For evaluation, PESS is performed to reconstruct simulator membrane deformation from four different static profiles and tested to observe the 3D surface of continuous membrane deformation. The PESS could suppress the phase errors of less than 30% less absolute errors than the conventional method and successfully reconstruct the 3D surface for low-frequency continuous membrane deformation with minimizing phase errors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adaptive Phase Error Suppression Concerning 3D surface Deformation Measurement on Color Digital Fringe Projection Profilometry

Suprijanto¹,

Zahra²,

Nadhira³

et al. 2022

Int. J. Adv. Sci. Eng. Inf. Technol.

View full text Add to dashboard Cite

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“…Nevertheless, all the aforementioned methods require three or more extra patterns, which will limit the speed of measurement. To reduce the number of patterns, some researchers have utilized color patterns for 3D measurement [18][19][20]. However, these methods have always failed for colorful objects.…”

Section: Introductionmentioning

confidence: 99%

Absolute Phase Retrieval Using One Coded Pattern and Geometric Constraints of Fringe Projection System

et al. 2018

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Fringe projection technologies have been widely used for three-dimensional (3D) shape measurement. One of the critical issues is absolute phase recovery, especially for measuring multiple isolated objects. This paper proposes a method for absolute phase retrieval using only one coded pattern. A total of four patterns including one coded pattern and three phase-shift patterns are projected, captured, and processed. The wrapped phase, as well as average intensity and intensity modulation, are calculated from three phase-shift patterns. A code word encrypted into the coded pattern can be calculated using the average intensity and intensity modulation. Based on geometric constraints of fringe projection system, the minimum fringe order map can be created, upon which the fringe order can be calculated from the code word. Compared with the conventional method, the measurement depth range is significantly improved. Finally, the wrapped phase can be unwrapped for absolute phase map. Since only four patterns are required, the proposed method is suitable for real-time measurement. Simulations and experiments have been conducted, and their results have verified the proposed method.

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“…Since the peaks in the image have to be searched, the method is sensitive to noise. Da [14] presented a color decoupling method based on a neural network. The method is fast, easy to carry out and needs no extra hardware.…”

Section: Introductionmentioning

confidence: 99%

A two-level space-time color-coding method for 3D measurements using structured light

Xue¹,

Zhao²,

Gao³

et al. 2015

Meas. Sci. Technol.

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Color-coding methods have significantly improved the measurement efficiency of structured light systems. However, some problems, such as color crosstalk and chromatic aberration, decrease the measurement accuracy of the system. A two-level space-time color-coding method is thus proposed in this paper. The method, which includes a space-code level and a time-code level, is shown to be reliable and efficient. The influence of chromatic aberration is completely mitigated when using this method. Additionally, a self-adaptive windowed Fourier transform is used to eliminate all color crosstalk components. Theoretical analyses and experiments have shown that the proposed coding method solves the problems of color crosstalk and chromatic aberration effectively. Additionally, the method guarantees high measurement accuracy which is very close to the measurement accuracy using monochromatic coded patterns.

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Neural network based color decoupling technique for color fringe profilometry

Cited by 15 publications

References 22 publications

Adaptive Phase Error Suppression Concerning 3D surface Deformation Measurement on Color Digital Fringe Projection Profilometry

Adaptive Phase Error Suppression Concerning 3D surface Deformation Measurement on Color Digital Fringe Projection Profilometry

Absolute Phase Retrieval Using One Coded Pattern and Geometric Constraints of Fringe Projection System

A two-level space-time color-coding method for 3D measurements using structured light

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