Line structured light 3D measurement technology for pipeline microscratches based on telecentric lens

Wang, Zhenjie; Liu, Shaoli; Hu, Jia; Zhang, Wen‐Xiong; Huang, Hao; Liu, Jianhua

doi:10.1117/1.oe.60.12.124108

Cited by 6 publications

(2 citation statements)

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“…Compared to entocentric lenses, telecentric lenses greatly reduce image distortion and perspective errors that occur when magnification varies with the distance of the object, which is especially important for gauging applications where non-flat objects must be inspected [16]. With this feature, telecentric imaging systems have been widely used to machine vision applications, including form error evaluation, geometry recognition, 3D reconstruction, etc [17,18]. In addition, research has suggested the possibility of applying telecentric imaging techniques to algebraic geometric forms [19].…”

Section: Introductionmentioning

confidence: 99%

Sphericity measurement based on telecentric imaging mechanism with image distortion correction and eccentricity error compensation

Huang,

Lian,

Yang

et al. 2023

Meas. Sci. Technol.

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Sphericity is an essential geometric parameter for determining the processing manufacturing quality of spherical components. This study presents a sphericity measurement method based on telecentric imaging mechanism with image distortion correction and eccentricity error compensation. A sphericity measurement system is designed, and the projection images of cross-section on equatorial plane of measured sphere are acquired using a line scan camera with bilateral telecentric lenses. An analytical camera model for this sphericity measurement system is established with considering major sources of image distortion. The subpixel edge points of the projection images are extracted and converted to the cross-sectional profile on equatorial plane according to the camera model. An eccentricity error compensation strategy for contour matching of the obtained cross-sectional profile on equatorial plane is also developed to get the three-dimensional contour point coordinates of the sphere. Sphericity is then calculated according to the least square criterion. The effectiveness of the proposed method is verified by measuring two steel balls with diameter in 20 mm and 30 mm. The sphericity measurement error is reduced by 0.3383 mm and 0.4653 mm respectively after image distortion correction, and is reduced by 0.2268 mm and 0.0795 mm respectively after eccentricity error compensation. The proposed method can be extended to form error measurements to opaque components with rotary structure on the outer contour.

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Section: Introductionmentioning

confidence: 99%

Sphericity measurement based on telecentric imaging mechanism with image distortion correction and eccentricity error compensation

Huang,

Lian,

Yang

et al. 2023

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Measurements on different parts show that the method improves the integrity of the surface. Wang [ 30 ] put the pipe on a turntable and the linear structured light measuring device on the middle of the pipe. The three-dimensional measurement of the inner wall of the pipe was realized by rotating the pipe.…”

Section: Introductionmentioning

confidence: 99%

A Three-Dimensional Structured Light Vision System by Using a Combination of Single-Line and Three-Line Lasers

Sun

Ren

Zhu

et al. 2022

Sensors

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A multi-line structured light measurement method that combines a single-line and a three-line laser, in which precision sliding rails and displacement measurement equipment are not required, is proposed in this paper. During the measurement, the single-line structured light projects onto the surface of an object and the three-line structured light remains fixed. The single-line laser is moved and intersects with the three-line laser to form three intersection points. The single-line light plane can be solved using the camera coordinates of three intersection points, thus completing the real-time calibration of the scanned light plane. The single-line laser can be scanned at any angle to determine the overall complete three-dimensional (3D) shape of the object during the process. Experimental results show that this method overcomes the difficulty of obtaining information about certain angles and locations and can effectively recover the 3D shape of the object. The measurement system’s repetition error is under 0.16 mm, which is sufficient to measure the 3D shapes of complicated workpieces.

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The influence of active projection speckle patterns on underwater binocular stereo vision 3D imaging

Zhuang

Zhang

et al. 2023

Optics Communications

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Line structured light 3D measurement technology for pipeline microscratches based on telecentric lens

Cited by 6 publications

References 0 publications

Sphericity measurement based on telecentric imaging mechanism with image distortion correction and eccentricity error compensation

Sphericity measurement based on telecentric imaging mechanism with image distortion correction and eccentricity error compensation

A Three-Dimensional Structured Light Vision System by Using a Combination of Single-Line and Three-Line Lasers

The influence of active projection speckle patterns on underwater binocular stereo vision 3D imaging

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