Summary on calibration method of line-structured light sensor

Zhang, Xi; Zhang, Jian

doi:10.1109/robio.2017.8324571

Cited by 8 publications

(2 citation statements)

References 17 publications

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“…Other laser-plane calibration methods (Zhang and Zhang, 2017) include the single cylindrical target (Li et al, 2022), cross-ratio unchanged calibration method (Hu et al, 2010), three-point perspective principle (Han et al, 2009), vanishing point calculation, circular targets (Gong et al, 2017) and cylindrical object (Zhu et al, 2020). Chen et al, 2012b) proposed an optical plane calibration method based on the active vision technique to realize the automatic calibration of line-structured light sensors, and their method accomplished the calibration in two steps by controlling the sensor to perform some translational motions.…”

Section: Introductionmentioning

confidence: 99%

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

Liu²,

Liu³

2023

RIA

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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.

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Section: Introductionmentioning

confidence: 99%

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

Liu²,

Liu³

2023

RIA

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“…Sensor accuracy is one of the most concerned issues for the calibration and the application [25]. Current calibration error generally ranges from hundreds to tens of microns, and seems to have reached their limits [26]. With the increasing demands for geometrical measurement of precision parts, higher accuracy is required.…”

Section: Introductionmentioning

confidence: 99%

Data-Driven Laser Plane Optimization for High-Precision Numerical Calibration of Line Structured Light Sensors

Zhou

Pan

et al. 2021

IEEE Access

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Line structured light sensor has been applied in various three dimensional (3D) measurement scenes with the advantages of non-contact, low cost and high speed. Its accuracy, which is directly determined by the calibration method, needs to be further improved to fulfill the measuring tasks of precision parts. Here, we proposed a numerical method that can eliminate the errors of the model based methods through two strategies. One is the establishment of the numerical mapping relationship between stripe pixel coordinates and their world coordinates through piecewise cubic interpolation. Corner points of a checkerboard target are used to obtain sufficient interpolating nodes. This target can be manually aligned with the laser plane and the alignment error would be eliminated via the point projection. The other is the data-driven laser plane optimization. The data set of reference interval distance is computed based on the invariance of cross ratio. The optimization model is to minimize the root mean squared error of measured interval distances by adjusting the laser plane coefficients. After the optimization, a higher numerical mapping relationship can be achieved. It bypasses the camera and the distortion models and reaches a calibration error of only 0.005mm. The comparison studies and the measurement of the steps further validate the proposed method.

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A Review: Application Research of Intelligent 3D Detection Technology Based on Linear-Structured Light

Chen

Tao

Zhao

et al. 2021

Transactions on Intelligent Welding Manufacturing

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Summary on calibration method of line-structured light sensor

Cited by 8 publications

References 17 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

Data-Driven Laser Plane Optimization for High-Precision Numerical Calibration of Line Structured Light Sensors

A Review: Application Research of Intelligent 3D Detection Technology Based on Linear-Structured Light

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