Calibration model for line structured light vision sensor

Xinyu, 陈新禹 Chen; Zi, 马孜 Ma; Tianfei, 陈天飞 Chen

doi:10.3788/ope.20122011.2345

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, Chen et al (2012a) proposed a simultaneous calibration method based on a single-plane calibration target, which contains a concentric circle and two orthogonal lines passing through its center. Wei et al (2014) proposed a geometrical calibration method for a line-structured light vision sensor via three parallel straight lines on a 2D target.…”

Section: Introductionmentioning

confidence: 99%

A unified calibration method of 3D laser profile measurement with different of laser-line lengths

Liu²,

Liu³

2023

RIA

View full text Add to dashboard Cite

Purpose Existing calibration methods mainly focus on the camera laser-plane calibration of a single laser-line length, which is not convenient and cannot guarantee the consistency of the results when several three-dimensional (3D) scanners are involved. Thus, this study aims to provide a unified step for different laser-line length calibration requirements for laser profile measurement (LPM) systems. Design/methodology/approach 3D LPM is the process of converting physical objects into 3D digital models, wherein camera laser-plane calibration is critical for ensuring system precision. However, conventional calibration methods for 3D LPM typically use a calibration target to calibrate the system for a single laser-line length, which needs multiple calibration patterns and makes the procedure complicated. In this paper, a unified calibration method was proposed to automatically calibrate the camera laser-plane parameters for the LPM systems with different laser-line lengths. The authors designed an elaborate planar calibration target with different-sized rings that mounted on a motorized linear platform to calculate the laser-plane parameters of the LPM systems. Then, the camera coordinates of the control points are obtained using the intersection line between the laser line and the planar target. With a new proposed error correction model, the errors caused by hardware assembly can be corrected. To validate the proposed method, three LPM devices with different laser-line lengths are used to verify the proposed system. Experimental results show that the proposed method can calibrate the LPM systems with different laser-line lengths conveniently with standard steps. Findings The repeatability and accuracy of the proposed calibration prototypes were evaluated with high-precision workpieces. The experiments have shown that the proposed method is highly adaptive and can automatically calibrate the LPM system with different laser-line lengths with high accuracy. Research limitations/implications In the repeatability experiments, there were errors in the measured heights of the test workpieces, and this is because the laser emitter had the best working distance and laser-line length. Practical implications By using this proposed method and device, the calibration of the 3D scanning laser device can be done in an automatic way. Social implications The calibration efficiency of a laser camera device is increased. Originality/value The authors proposed a unified calibration method for LPM systems with different laser-line lengths that consist of a motorized linear joint and a calibration target with elaborately designed ring patterns; the authors realized the automatic parameter calibration.

show abstract

Section: Introductionmentioning

confidence: 99%

A unified calibration method of 3D laser profile measurement with different of laser-line lengths

Liu²,

Liu³

2023

RIA

View full text Add to dashboard Cite

show abstract

“…On the other hand, Liu et al put forward the spherical target calibration theory, and completed calibration of the light plane based on the intersection of the space cone and the space ball. Meanwhile, Wei et al found that through the effective use of known equidistant parallel lines, the plane blanking line can be obtained, which creates conditions for the further realization of light plane calibration, that is, the parallel line target [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The 3D reconstruction method of a line-structured light vision sensor based on composite depth images

Wang¹,

Zhehai²

2021

Meas. Sci. Technol.

View full text Add to dashboard Cite

In order to simplify the three-dimensional (3D) reconstruction process of a rotating scanning line-structured light vision sensor, a 3D reconstruction method of composite depth images is proposed. First, a frame of an image acquired by a camera at a constant speed is converted into a column of data in the composite pixel image. Second, the composite pixel image is transformed into a depth image via coordinate transformation. Finally, the 3D coordinates of the object are calculated from the depth image by perspective transformation. The parameters of the light plane are calibrated by using a one-dimensional target, and the focal length of the depth image is calibrated by using a ball target. Compared with the traditional 3D reconstruction method of a structured light vision sensor, this method uses a composite depth image instead of point cloud splicing, which is simple to operate and flexible to calibrate, and further improves the efficiency of the 3D reconstruction of a structured light vision sensor. Experiments show that the absolute error of the 3D measurement in the measurement range of 380–4000 mm is less than 0.21 mm, and the accuracy is higher than 0.26%, which significantly improves the measurement efficiency and point cloud density of the system, and can meet the general 3D reconstruction requirements of the scene.

show abstract

Summary on calibration method of line-structured light sensor

Zhang

2017

2017 IEEE International Conference on Robotics and Biomimetics (ROBIO)

View full text Add to dashboard Cite

Calibration model for line structured light vision sensor

Cited by 3 publications

References 0 publications

A unified calibration method of 3D laser profile measurement with different of laser-line lengths

A unified calibration method of 3D laser profile measurement with different of laser-line lengths

The 3D reconstruction method of a line-structured light vision sensor based on composite depth images

Summary on calibration method of line-structured light sensor

Contact Info

Product

Resources

About