High Camera Calibration Method Based on True Coordinate Computation of Circle Center

Xiaodong, 卢晓冬 Lu; Junpeng, 薛俊鹏 Xue; Qican, 张启灿 Zhang

doi:10.3788/cjl202047.0304008

Cited by 15 publications

(2 citation statements)

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“…The method is simple to operate and has high precision. The hierarchical step-bystep calibration method is a projective reconstruction of image sequence, on the basis of which affine calibration and European calibration are carried out, and the internal and external parameters of the camera are obtained by nonlinear optimization algorithm [6] . The initial parameters of the method are fuzzy and the convergence is uncertain.…”

Section: Recent Workmentioning

confidence: 99%

Research on calibration method of infrared camera based on thermal radiation enhancement

Zhao,

Cao

2024

International Conference on Frontiers of Applied Optics and Computer Engineering (AOCE 2024)

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Infrared camera is a photoelectric device that obtains temperature by detecting thermal radiation. With the need of multisensor fusion application, the accurate acquisition of camera parameters has become an important topic. Based on Zhang Zhengyou's calibration method, infrared thermal radiation is used to enhance the reflectivity of the calibration plate. The asymmetric circle is used as the calibration pattern and the circle center is used as the calibration feature. The preprocessing method of calibration image is designed by contrast experiment. The preparation of calibration image is completed through two steps of image contrast enhancement and image binarization under uneven illumination. The error rate of infrared camera calibration reaches 0.04%. This method avoids complex active infrared calibration plate making, improves the problem of difficult extraction of corner features in infrared images, and solves the infrared calibration problem with simple and easy to obtain tools, and obtains sufficient accuracy

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Section: Recent Workmentioning

confidence: 99%

Research on calibration method of infrared camera based on thermal radiation enhancement

Zhao,

Cao

2024

International Conference on Frontiers of Applied Optics and Computer Engineering (AOCE 2024)

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“…To solve the locating error, Ahn et al initially presented a mathematical description of the eccentric error, whereas its form and calculation are complicated [17]. Zhu et al used the transformation matrix obtained from the asymmetric projection information to correct the calibration error [18]. This method, however, requires relatively a high initial value.…”

Section: Introductionmentioning

confidence: 99%

Novel camera calibration method based on invariance of collinear points and pole–polar constraint

Liang

Gao

Huo

et al. 2023

J. of Syst. Eng. Electron.

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To address the eccentric error of circular marks in camera calibration, a circle location method based on the invariance of collinear points and pole-polar constraint is proposed in this paper. Firstly, the centers of the ellipses are extracted, and the real concentric circle center projection equation is established by exploiting the cross ratio invariance of the collinear points. Subsequently, since the infinite lines passing through the centers of the marks are parallel, the other center projection coordinates are expressed as the solution problem of linear equations. The problem of projection deviation caused by using the center of the ellipse as the real circle center projection is addressed, and the results are utilized as the true image points to achieve the high precision camera calibration. As demonstrated by the simulations and practical experiments, the proposed method performs a better location and calibration performance by achieving the actual center projection of circular marks. The relevant results confirm the precision and robustness of the proposed approach.

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A High-accuracy Camera Calibration Method Based on Special Circular Target

Wen

Yang

et al. 2022

2022 International Conference on Industrial Automation, Robotics and Control Engineering (IARCE)

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High Camera Calibration Method Based on True Coordinate Computation of Circle Center

Cited by 15 publications

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Research on calibration method of infrared camera based on thermal radiation enhancement

Research on calibration method of infrared camera based on thermal radiation enhancement

Novel camera calibration method based on invariance of collinear points and pole–polar constraint

A High-accuracy Camera Calibration Method Based on Special Circular Target

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