A novel method for 3D reconstruction in tight and restricted space based on improved line-structured light

Li, Tianyu; Duan, Fajie; Fu, Xiao; Liu, Changwen; Liang, Chunjiang; Chen, Anqi; Li, Xin

doi:10.1016/j.measurement.2023.112930

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…Chao and others [14][15][16] proposed a detection method and system for special objects such as artillery barrels, but the relevant design is only applicable to the barrel itself. Li et al [17] designed a structured-light sensor with a coaxial arrangement of the camera and light source, but this cannot collect the contour near the bottom face for unilateral closed tubes such as plug heads. Li et al [18] constructed a set of virtual binocular structured light measurement systems by using planar mirrors.…”

Section: Introductionmentioning

confidence: 99%

Internal surface inspection method under linear structured light illumination based on dual non-coaxial optical paths

Zhang (张芷民),

Li (李鹏阳),

Huang (黄秋红)

et al. 2024

Meas. Sci. Technol.

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The inner space of tubular and hole-like workpieces, such as oil pipes and cylinders, is limited in volume and has no effective means of measuring the inner surface under geometric constraints. This paper proposes a non-coaxial optical path line structured light method for inner surface inspection, which can significantly reduce the device size and working distance. The method constructs two non-coaxial optical paths for light source and imaging, and uses two fixed reflectors to achieve the deflection of the optical axes of the light source and imaging paths. After theoretical derivation and verification, a sample device was designed and fabricated for experiments. The device measures approximately 22mm by 24mm in cross-section, the maximum insertion distance is about 200mm, and the minimum inner diameter of the accessible space is 50mm. The results show that the optical path design does not destroy the original homography relationship, and can still ensure the measurement capability comparable to the existing methods when reducing the device size to 10% of the original. The method has obvious advantages when applied to the inspection of tubular and hole-like workpieces in fields such as petrochemical industry, military equipment, etc.

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Section: Introductionmentioning

confidence: 99%

Internal surface inspection method under linear structured light illumination based on dual non-coaxial optical paths

Zhang (张芷民),

Li (李鹏阳),

Huang (黄秋红)

et al. 2024

Meas. Sci. Technol.

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“…With the efforts of these researchers, these line-based instruments possess a compact structure and wide range [23]. However, they require adjusting the relative position between the inner wall and sensor, which significantly affects the measurement accuracy and increases the complexity of the measurement system.…”

Section: Introductionmentioning

confidence: 99%

Accuracy improvement of a multi-ring beam structured inner surface measurement: via novel calibration methodology and light source optimization

Li,

Deng,

et al. 2024

Meas. Sci. Technol.

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Parts with a large depth-to-diameter ratio play a critical role in the military, aerospace, and automotive industries. However, accurately measuring their inner surface profile remians challenging owing to the lack of adequate and accurate sensors. We developed a multi-ring structured light system to obtain three-dimensional data of inner contours, such as inner diameters, which are crucial for ensuring component performance and safety. In this study, we proposed three simple yet effective techniques to improve the multi-ring beam structured measurement system. First, we designed a distortion correction method to calibrate the imaging system. Second, a two-step calibration approach was used to calibrate the multi-ring projection. Meanwhile, we benchmarked the effects of different light sources on image speckles. The calibration results demonstrated that the coefficient of determination (R-2) used for line fitting exceeded 0.999. Moreover, the measurement experimental results show that the uncertainty of less than 10 µm and the smallest measurable pipe inner diameter can reach 15 mm, demonstrating that our methods are promising for improving the accuracy of structured light optical sensing systems. This system satisfies the measurement requirements and can be immediately utilized to meet the high demand for inner contour measurements in industrial applications.

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“…Because of its advantages of fast measurement speed and high measurement precision, structured light is widely used in cultural relics protection, surface detection, face recognition, and other fields. At present, scholars have systematically studied various visual detection technologies using structured light, such as calibration methods with high measurement accuracy, 1,2 phase solution methods, 3,4 and many methods to compensate for nonlinear errors in the reconstruction process, 5–7 making structured light technology more robust and more widely used. Although the structured light detection technology is relatively mature, most detection processes consider offline rather than online vision detection.…”

Section: Introductionmentioning

confidence: 99%

Research on error compensation method of topography dynamic reconstruction of chattering thin-walled parts based on structured light detection

Li,

Lv,

Liu

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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In order to achieve visual measurement error compensation for the surface of thin-walled components with chatter, a new real-time adaptive correction method for chatter motion error is proposed in this paper. Firstly, according to the mechanism of the chatter effect, an error analysis model of the dynamic structured light phase principal value is derived. Then, a real-time optimization method for the motion phase error in the frame of structured light projection is proposed. Meanwhile, a compensation method based on an adaptive grating projection period is proposed to eliminate the cumulative error of inter-frame chatter motion. Finally, a structured light visual inspection system and an experimental platform for chattering thin-walled parts are established for experimental verification. The experimental results under slight and severe chatter conditions indicate that the proposed method can optimize the phase errors within the projected frame in real time under any scenario, compensate for the cumulative errors between projected frames, and improve the point cloud accuracy of real-time 3D reconstruction.

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A novel method for 3D reconstruction in tight and restricted space based on improved line-structured light

Cited by 8 publications

References 17 publications

Internal surface inspection method under linear structured light illumination based on dual non-coaxial optical paths

Internal surface inspection method under linear structured light illumination based on dual non-coaxial optical paths

Accuracy improvement of a multi-ring beam structured inner surface measurement: via novel calibration methodology and light source optimization

Research on error compensation method of topography dynamic reconstruction of chattering thin-walled parts based on structured light detection

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