Method of solving intrinsic parameters of camera with two center-sharing and principal axis orthonormal intersected identical ellipses

A common center, camera technology, applied in the field of ellipse template

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

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Problems solved by technology

In the quadratic curve, the circle is a very special figure. There is no clear calibration method for the general quadratic curve. However, this paper is based on the calibration of the quadratic curve and gives a more general quadratic curve than the circle. Camera calibration method for curves, i.e. ellipses

Method used

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  • Method of solving intrinsic parameters of camera with two center-sharing and principal axis orthonormal intersected identical ellipses
  • Method of solving intrinsic parameters of camera with two center-sharing and principal axis orthonormal intersected identical ellipses
  • Method of solving intrinsic parameters of camera with two center-sharing and principal axis orthonormal intersected identical ellipses

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Embodiment

[0032] The present invention proposes to use two intersecting identical ellipses with any co-axis on the plane as the target linearly to determine the internal parameters of the 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.

[0033] The experimental template used in the camera calibration method based on two intersecting identical ellipses of the co-axis is two intersecting identical ellipses with any co-axis on the plane, such as figure 1 shown. is the intersection point of two ellipses, and the camera used for the experiment is calibrated using the method of the present invention, and the specific steps are as follows:

[0034] 1. Fitting the projection curve equation of the ellipse in the image

[0035] The image resolution that the present invention adopts is 640 * 480 pixels, takes a plurality of experimental ...

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Abstract

The invention discloses a target used for self-calibrating of a camera and consisting of two center-sharing and principal axis orthonormal intersected identical ellipses. A method comprises the particular steps that peripheral points of the ellipses are extracted from an image; elliptic equations are fitted to solve simulacra of intersection points of the two ellipses; vanishing points in orthogonal directions of a plane of the image are obtained according to the attribute of a cross ratio of four collinear points and to the fact that two parallel straight lines are intersected at an infinite point; coordinates of simulacra of circular ring points are solved through a Laguerre theorem inferentially; and intrinsic parameters of the camera are solved by the constraint of image points of the circular ring points and a simulacrum of an absolute conic. With the adoption of the target, full automatic calibrating can be realized, and errors due to measuring in a calibrating process are reduced. As the absolute conic is a more concise and global element, the calibration accuracy is improved in the camera calibrating process.

Description

technical field [0001] The invention belongs to the field of computer research and relates to an ellipse template for solving internal parameters of a camera. Using two identical intersecting ellipses orthogonal to the common central axis on the plane as a calibration template, using the properties of the quadratic curve to obtain the image coordinates of the ring point, linearly determine the internal parameters of the 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 camera i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 赵越余敦来
Owner YUNNAN UNIV
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