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Camera parameter calibration method based on self-matching polar triangle

A calibration method and camera parameter technology, applied in image data processing, instrumentation, calculation, etc., can solve problems such as inability to solve external parameters of the camera, and achieve the effects of improving robustness, solving mismatching, and high robustness

Inactive Publication Date: 2019-05-14
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

In 1999, Zhang Zhengyou proposed a camera parameter calibration method based on checkerboard markers, which solves the calibration parameters through the geometric relationship between the corner points of the checkerboard and the corresponding image points from multiple viewpoints. The calibration results are highly coupled, so it is not suitable for some complex and specific environments
In 2015, Huang et al. proposed a concentric ring calibration method based on self-aligning pole triangles, but due to the isotropy of the rings, it cannot solve the external parameters of the camera

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  • Camera parameter calibration method based on self-matching polar triangle
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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0019] The invention establishes a camera projection model, utilizes the characteristics of the self-matching pole triangle and the absolute quadratic curve, establishes a distortion model and a cost function, and performs initial estimation and nonlinear optimization of camera internal parameters and external parameters respectively.

[0020] A camera parameter calibration method based on the self-aligning pole triangle proposed by the present invention, the main links include: the design of the calibration plate and the establishment of the camera projection model, the solution of the camera internal and external parameters in the linear initialization, the distortion model and the cost in the nonlinear optimization The establishment of the function and the iterative metho...

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Abstract

The invention provides a camera parameter calibration method based on a self-matching polar triangle. The camera parameter calibration method mainly comprises the steps of calibration plate design andestablishment of a camera projection model, solving of internal parameters and external parameters of a camera in linear initialization, establishment of a distortion model and a cost function in nonlinear optimization and an iteration method of an optimal solution. According to the method, the internal parameters and the external parameters of the camera can be solved more flexibly and more robustly.

Description

technical field [0001] The invention relates to the fields of computer vision, computer photography and image engineering, in particular to a camera parameter calibration model and method. Background technique [0002] Camera calibration is a very critical link in the application of image measurement and machine vision. It establishes the geometric model of camera imaging to determine the geometric position of the surface point of the space object and the geometric relationship between the corresponding points in the image. It can be used in the later stage according to the requirements. Practical applications such as ranging, pose estimation, and 3D reconstruction. However, the accuracy of the calibration results and the stability of the algorithm directly affect the accuracy of the camera work results. Accurate and stable calibration results are of great significance to the accuracy of subsequent ranging and pose estimation, as well as the improvement of the quality of 3D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
Inventor 周果清张琦吴淇王庆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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