Color-encoded single-shot computer-generated Moiré profilometry

Zhang, Hechen; Cao, Yiping; Li, Chengmeng; Wang, Lu; Li, Hongmei; Xu, Chuan; Wan, Yingying

doi:10.1038/s41598-021-90522-x

Cited by 9 publications

(2 citation statements)

References 31 publications

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“…They implemented an enhanced morphological component analysis method to separate texture and fringe patterns from a single RGB fringe pattern, and this method achieved better performance than the traditional single-pattern methods. Zhang et al [35] combined two fringe patterns with a phase shift of π into the red and blue channels to form a single colorcoded pattern. Then, the captured color-coded pattern can be used to extract two Moiré patterns [36] for retrieving phase information.…”

Section: A Traditional Single-pattern Structured Light Methodsmentioning

confidence: 99%

Super-Resolution Phase Retrieval Network for Single-Pattern Structured Light 3D Imaging

Song

Liu

Sowmya

et al. 2023

IEEE Trans. on Image Process.

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Structured light 3D imaging is often used for obtaining accurate 3D information via phase retrieval. Single-pattern structured light 3D imaging is much faster than multi-pattern versions. Current phase retrieval methods for single-pattern structured light 3D imaging are however not accurate enough. Besides, the projector resolution in a structured light 3D imaging system is expensive to improve due to hardware costs. To address the issues of low accuracy and low resolution of single-pattern structured light 3D imaging, this work proposes a super-resolution phase retrieval network (SRPRNet). Specifically, a phase-shifting module is proposed to extract multi-scale features with different phase shifts, and a refinement and super-resolution module is proposed to obtain refined and super-resolution phase components. After phase demodulation and unwrapping, high-resolution absolute phase is obtained. A sine shifting loss and a cosine shifting loss are also introduced to form the regularization term of the loss function. As far as can be ascertained, the proposed SRPRNet is the first network for super-resolution phase retrieval by using a single pattern, and it can also be used for standard-resolution phase retrieval. Experimental results on three datasets show that SRPRNet achieves state-of-the-art performance on 1×, 2×, and 4× superresolution phase retrieval tasks.

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Section: A Traditional Single-pattern Structured Light Methodsmentioning

confidence: 99%

Super-Resolution Phase Retrieval Network for Single-Pattern Structured Light 3D Imaging

Song

Liu

Sowmya

et al. 2023

IEEE Trans. on Image Process.

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“…Recently, our group proposed several types of computer-generated Moiré profilometry (CGMP) 18 – 22 These methods inherit the advantages of the high-precision measuring characteristics of PMP and single-shot measuring characteristics of FTP, but their measuring accuracy is not selectable. In order to maintain the characteristics of single-shot real-time measurement while making its measuring accuracy selectable as appropriate N, a single-shot N-step phase measuring profilometry (single-shot N-PMP) was proposed, 23 which is a single-shot method with the highest accuracy among the single-shot 3D measurements so far in the inheritance of the traditional optional N-step PMP.…”

Section: Introductionmentioning

confidence: 99%

Double-shot N-step phase measuring profilometry

Cao

et al. 2023

Opt. Eng.

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.Recently, a single-shot N-step phase measuring profilometry was proposed by our research group. It not only maintains the single-shot real-time measuring characteristics but also makes its measuring accuracy selectable as appropriate N. But when the spectral aliasing in the captured deformed pattern is severe, the alternative current (AC) component may be extracted imprecisely or even failed. So, a double-shot N-step phase measuring profilometry (double-shot N-PMP) is proposed. While two complementary sinusoidal gratings are projected onto the measured object, the AC component of the captured deformed patterns can be extracted precisely even if spectrum aliasing is very serious. If the AC component multiplies with N frames of the AC components of the N-step phase-shifting fringe patterns captured from the reference plane in advance, a new N-step phase-shifting algorithm for the phase difference between the measured object and the reference plane is accomplished to reconstruct the measured object. The experimental results show the possibility and effectiveness of the proposed method. It can either improve the measuring accuracy or expand application scope. Though the double-frame gratings are needed, the real-time measuring characteristics can still maintain with the time-division multiplexing method.

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Single-shot N-step Phase Measuring Profilometry based on algebraic addition and subtraction

Cao

Yang

et al. 2023

Optik

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Color-encoded single-shot computer-generated Moiré profilometry

Cited by 9 publications

References 31 publications

Super-Resolution Phase Retrieval Network for Single-Pattern Structured Light 3D Imaging

Super-Resolution Phase Retrieval Network for Single-Pattern Structured Light 3D Imaging

Double-shot N-step phase measuring profilometry

Single-shot N-step Phase Measuring Profilometry based on algebraic addition and subtraction

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