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Method for solving intrinsic parameters of parabolic catadioptric camera linearly by utilizing three unparallel straight lines in space

A technology of camera internal parameters, parallel straight lines, applied in the field of computer research

Inactive Publication Date: 2013-03-20
YUNNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The document "Plane-based calibration of central catadioptric cameras", (S.Gasparini, P.Sturm, J.P.Barreto, IEEE 12th International Conference on Computer Vision, pp. 1195-1202, 2009) uses a two-dimensional template with control points , these control points can be corner points, drawn points or any points that are easy to extract from the image, but this method needs to use an iterative method to solve the internal and external parameters

Method used

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  • Method for solving intrinsic parameters of parabolic catadioptric camera linearly by utilizing three unparallel straight lines in space
  • Method for solving intrinsic parameters of parabolic catadioptric camera linearly by utilizing three unparallel straight lines in space
  • Method for solving intrinsic parameters of parabolic catadioptric camera linearly by utilizing three unparallel straight lines in space

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Embodiment

[0033] The invention proposes to use three non-parallel straight lines in space as targets to linearly determine the internal parameters of the parabolic catadioptric camera. The experimental module structure diagram that the present invention adopts is as figure 1 shown. The implementation of the present invention will be described in more detail with an example below.

[0034] The experimental template used by the parabolic catadioptric camera calibration method based on three non-parallel straight lines in space is three non-parallel straight lines in space, such as figure 1 shown. The three straight lines are , , , using the method in the present invention to calibrate the parabolic catadioptric camera used in the experiment, the specific steps are as follows:

[0035] 1. Fit the curve equation of the straight line projection in the image

[0036] The image resolution that the present invention adopts is 640 * 480 pixels, takes 1 experimental picture with the par...

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Abstract

The invention relates to a method for solving intrinsic parameters of a parabolic catadioptric camera linearly by utilizing three unparallel straight lines in a space. The method comprises the steps that a target consisting of the three unparallel straight lines in the space and used for automatic calibration of the parabolic catadioptric camera is utilized; the parabolic catadioptric camera is used to shoot an image of the target; the linear parabolic catadioptric image is a quadratic curve; target image points are extracted from the image; curvilinear equations are fitted; an intersection point of every two curves is solved; images of three pairs of circular ring points on a plane of the image are obtained according to a polar principle and a diameter concyclic center attribute; and the parameters in the camera are solved by utilizing linear restriction of the images of the circular ring points on an absolute conic. With the adoption of the target in the method, full automatic calibration can be realized, and errors due to measurement in a calibration process are reduced. As the straight lines are elements which are more concise and global, the calibration accuracy is improved in the calibration process of the camera.

Description

technical field [0001] The invention belongs to the field of computer research and relates to a straight line template for solving internal parameters of a parabolic catadioptric camera. Using three non-parallel straight lines in space as calibration templates, using the properties of quadratic curves to obtain the images of three groups of ring points, linearly determine the internal parameters of the parabolic catadioptric camera. Background technique [0002] One of the basic tasks of computer vision is to restore the geometric information of objects in three-dimensional space from the two-dimensional image information obtained by the camera, so as to recognize and reconstruct the geometric shape of objects in three-dimensional space. In this process, the relationship between the three-dimensional geometric position of the spatial object point and its corresponding point in the image must be determined, and this relationship is determined by the geometric model of the cam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 赵越李聪
Owner YUNNAN UNIV
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