A Refractive Stereo Structured-Light 3-D Measurement System for Immersed Object

Hu, Yeqi; Rao, Wei; Qi, Lin; Dong, Junyu; Cai, Jinzhen; Fan, Hao

doi:10.1109/tim.2022.3231331

Cited by 9 publications

(2 citation statements)

References 49 publications

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“…With the continuous development of intelligent applications, robotics plays an increasingly important role in modern industry. Line laser sensors, as a non-contact measurement technology, can quickly acquire the two-dimensional contour of the surface of the object under test and are often used in highprecision three-dimensional measurement systems [1] [2]. Hand-eye calibration is a crucial task in robotmounted line laser sensor 3D measurement systems.…”

Section: Introductionmentioning

confidence: 99%

Hand-eye calibration of line structured-light sensor based on double-sphere constraints

Ruan,

Deng,

Hao

et al. 2024

J. Phys.: Conf. Ser.

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Aiming at the complex problem of solving the positional relationship between the line laser sensor at the end of the robot wrist and the coordinate system of the end flange, a line laser hand-eye calibration method based on a double ball fixed target is proposed. Firstly, a double standard ball with known radius and center distance is used as a reference tool, and the point cloud data of a single contour line is collected several times, and the coordinates of the two ball centers under the camera coordinate system can be obtained according to the center coordinates of the circle obtained from the fitted circle combined with the Pythagoras theorem. Then, according to the principle that the two spherical centers are fixed under the robot base coordinate system, the rigid transformation matrix between the line laser sensor and the robot is successively solved. When solving the rotation matrix, the constraint of the distance between the spherical centers of the two balls is introduced to obtain a solution with better accuracy. Experimental results show that the method has better overall performance compared with the traditional single-ball hand-eye calibration method.

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Section: Introductionmentioning

confidence: 99%

Hand-eye calibration of line structured-light sensor based on double-sphere constraints

Ruan,

Deng,

Hao

et al. 2024

J. Phys.: Conf. Ser.

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“…Stereoscopic vision technology [ 1 , 2 , 3 , 4 , 5 , 6 ] is a technology that mimics human eye imaging. It uses two or more cameras to image the same object from different orientations and then calculates the parallax through stereo matching.…”

Section: Introductionmentioning

confidence: 99%

A New Vision Measurement Technique with Large Field of View and High Resolution

Liu

You

et al. 2023

Sensors

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The three-dimensional (3D) displacement resolution of conventional visual measurement systems can only reach tens of microns in cases involving long measuring distances (2.5 m) and large fields of view (1.5 m × 1.5 m). Therefore, a stereo vision measurement technology based on confocal scanning is proposed herein. This technology combines macroscopic visual measurement technology with confocal microscopic measurement technology to achieve a long measuring distance, a large field of view, and micron-level measuring resolution. First, we analyzed the factors affecting the 3D resolution of the visual system and developed a 3D resolution model of the visual system. Subsequently, we fabricated a prototype based on the resolution model and the proposed stereo vision measurement technology. The 3D displacement resolution measurement results in the full field of view show that the displacement resolutions of the developed equipment in the x-, y-, and z-directions can reach 2.5, 2.5, and 6 μm, respectively.

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