Stadium marker line-based method and system for determining camera exterior parameters

A technology for marking lines and stadiums, applied in image data processing, image analysis, instruments, etc., to achieve the effect of improving accuracy

Inactive Publication Date: 2011-08-10
CHINA DIGITAL VIDEO BEIJING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method and system for determining the external parameters of the camera based on the stadium marking line, so as to deal with the situation that the point cannot be selected in practice, and to ensure the accuracy of the calibration of the external parameters of the camera

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  • Stadium marker line-based method and system for determining camera exterior parameters
  • Stadium marker line-based method and system for determining camera exterior parameters
  • Stadium marker line-based method and system for determining camera exterior parameters

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Embodiment Construction

[0053] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] In order to facilitate those skilled in the art to better understand the present invention, the method for calculating the camera calibration parameters will be briefly described below by taking the insertion of a 3D animation in a TV broadcast of a sports game as an example.

[0055] In order to insert a 3D animation at a predetermined position in the TV screen, it is necessary to know the corresponding relationship between the spatial position of the object and the imaging position of the object on the TV image, that is, it is necessary to establish the 3D world coordinates of the spatial point and its projection on the image The mapping relationship between the two-dimensional pixel coordinates of points.

[0056] This m...

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Abstract

The invention discloses a stadium marker line-based method for determining camera exterior parameters, which comprises the following steps of: selecting the marker line from the shot stadium image; acquiring the first coordinate of the mark line on the actual plane of the stadium and the second coordinate of the marker line on the shot stadium image; generating the projection mapping relationship between the marker line on the actual plane of the stadium and the marker line on the stadium image according to the first and second coordinates; calculating the projection mapping relationship between the point on the actual plane of the stadium and the point on the stadium image according to the projection mapping relationship of the marker lines; calculating the initial value of the current camera exterior parameter matrix according to the projection mapping relationship of the points and the camera interior parameters acquired in advance; and optimizing the initial value of the current camera exterior parameter matrix to acquire the final camera exterior parameter matrix. According to the method and system, the problem that a point cannot be selected actually can be solved and the accuracy of camera exterior parameter calibration can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of camera calibration, in particular to a method for determining external camera parameters based on stadium marking lines and a system for determining external camera parameters based on stadium marking lines. Background technique [0002] The basic purpose of camera calibration is to establish the mapping relationship between the three-dimensional world coordinates in the real space and the two-dimensional pixel coordinates in the image space. This mapping relationship is determined by the geometric model of the camera imaging, and the process of determining the relevant parameters of these geometric models is called camera calibration. [0003] Specifically, camera parameters can be subdivided into extrinsic parameters and intrinsic parameters. The internal parameters reflect the optical characteristics of the camera itself, specifically including the focal length of the camera, the principal point, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 刘剑秋
Owner CHINA DIGITAL VIDEO BEIJING
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