An integrated calibration technique for variable-boresight three-dimensional imaging system

Liu, Xingsheng; Li, Anhu

doi:10.1016/j.optlaseng.2022.107005

Cited by 5 publications

(3 citation statements)

References 45 publications

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“…The reason was that the baseline between each virtual camera was much smaller than the target depth, resulting in the uncertainty increase in the depth direction. The related works on 3D reconstruction using a variable boresight imaging system [ 10 , 37 ] also reported relatively lower accuracy in the depth direction. In our experiment, we quantitatively evaluated the MA and RMS reconstruction errors of the coded points, which could be accurately measured to serve as the true values.…”

Section: Methodsmentioning

confidence: 99%

A Virtual Multi-Ocular 3D Reconstruction System Using a Galvanometer Scanner and a Camera

Han

Zhang

2023

Sensors

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A novel visual 3D reconstruction system, composed of a two-axis galvanometer scanner, a camera with a lens, and a set of control units, is introduced in this paper. By changing the mirror angles of the galvanometer scanner fixed in front of the camera, the boresight of the camera can be quickly adjusted. With the variable boresight, the camera can serve as a virtual multi-ocular system (VMOS), which captures the object at different perspectives. The working mechanism with a definite physical meaning is presented. A simple and efficient method for calibrating the intrinsic and extrinsic parameters of the VMOS is presented. The applicability of the proposed system for 3D reconstruction is investigated. Owing to the multiple virtual poses of the camera, the VMOS can provide stronger constraints in the object pose estimation than an ordinary perspective camera does. The experimental results demonstrate that the proposed VMOS is able to achieve 3D reconstruction performance competitive with that of a conventional stereovision system with a much more concise hardware configuration.

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Section: Methodsmentioning

confidence: 99%

A Virtual Multi-Ocular 3D Reconstruction System Using a Galvanometer Scanner and a Camera

Han

Zhang

2023

Sensors

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“…For 2D scanners PMs are employed mainly in laser manufacturing and 3D printers (in order to provide the fast scan line) in competition to the most common dual axis galvanometer scanners (GSs) [11,12], Micro-Electro-Mechanical Systems (MEMS) with oscillatory elements [13], and rotational Risley prisms [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Measurement analysis of optical micrometers with polygonal mirror-based laser scanners

Teodorovits,

Mnerie,

Duma

2023

Optical Measurement Systems for Industrial Inspection XIII

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Polygon mirror (PM)-based laser scanners are the fastest opto-mechanical scanning system. One of their most common applications is in optical micrometers for industrial applications. The aim of the present work is to study experimentally such a system from the point of view of the non-linearity of their scanning function. In this respect, we built upon the developed opto-mechanical analysis and design of PM scanning heads [V.-F. Duma, M.-A. Duma, Applied Sciences 12(11), 5592, 2022]. Thus, testing measurements are performed regarding both the dimension and the position of the object to be measured, which is positioned between the two lenses (i.e., achromatic doublets) of a telescope positioned after the PM and preceding the system's photodetector (PD). The measuring method is discussed, and its errors are pointed out in obtaining the object's dimension on the direction of the scanning velocity (of the beam that sweeps the space between the telescope's lenses perpendicular on their optical axis), using the time interval when the PD receives no laser signal because of the obscuration by the object to be measured. The energy received by the PD with the rotation of the PM is measured for objects of different diameters placed between the lenses of the telescope at different positions with regard the optical axis of the lenses.

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“…The system calibration consists of the camera calibration and the light-plane calibration. Among them, the camera calibration is mainly to obtain the intrinsic parameters of the camera, and many related studies have been published in the past [13][14][15][16][17]. In our research, we assume that the camera has been calibrated, i.e., the intrinsic parameters of rhe camera are known.…”

Section: Introductionmentioning

confidence: 99%

Calibration Method for Line-Structured Light Three-Dimensional Measurement Based on a Simple Target

Zhang²,

Song

2022

Photonics

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Line-structured light three-dimensional (3D) measurement is apt for measuring the 3D profile of objects in complex industrial environments. The light-plane calibration, which is a crucial link, greatly affects the accuracy of measurement results. This paper proposes a novel calibration method for line-structured light 3D measurement based on a simple target, i.e., a single cylindrical target (SCT). First, the line-structured light intersects with the target to generate a light stripe. Meanwhile, the camera captures the calibration images, extracts the refined subpixel center points of the light stripe (RSCP) and detects the elliptic profiles of the two ends of the cylindrical target (EPCT). Second, two elliptical cones defined by the EPCT and the camera optical center are determined. Combining the two defined elliptical cones and the known radius of the SCT, we can uniquely solve the axis equation of the SCT. Finally, because the coordinates of RSCP in the camera coordinate system fulfill both the camera model and the cylindrical equation, these coordinates can be solved and used to obtain the optimal solution of the light-plane equation. The results of simulations and experiments verify that our proposed method has higher accuracy and effectiveness.

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An integrated calibration technique for variable-boresight three-dimensional imaging system

Cited by 5 publications

References 45 publications

A Virtual Multi-Ocular 3D Reconstruction System Using a Galvanometer Scanner and a Camera

A Virtual Multi-Ocular 3D Reconstruction System Using a Galvanometer Scanner and a Camera

Measurement analysis of optical micrometers with polygonal mirror-based laser scanners

Calibration Method for Line-Structured Light Three-Dimensional Measurement Based on a Simple Target

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