Method for linearly solving camera inner parameter by using two identical intersected ellipses

A camera internal parameter, ellipse technology, applied in the field of computer research, to achieve the effect of simple production

Inactive Publication Date: 2013-02-13
YUNNAN UNIV
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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

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  • Method for linearly solving camera inner parameter by using two identical intersected ellipses
  • Method for linearly solving camera inner parameter by using two identical intersected ellipses
  • Method for linearly solving camera inner parameter by using two identical intersected 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 relates to a method for linearly solving camera inner parameters by using two identical intersected ellipses. According to the method, a target drone which is formed by two identical intersected ellipses sharing the same main axis and which is calibrated by a camera is adopted; five images of the target drone are shot in different directions; an ellipse equation is extracted from the images and the intersection points of the two ellipse are solved; end points in the planes of the images in the orthogonal directions are obtained according to the polarity principle and the property of the cross ration of four straight lines; and camera inner parameters are linearly solved by using the end points in the orthogonal directions and the constraint of the images of absolute conics. With the adoption of the target drone in the method, the full-automatic calibration can be implemented, the error caused by the measurement in the calibration process is reduced, and the calibration precision in the calibration process of the camera is improved as the conic is a simpler and more global-oriented element.

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. Two identical intersecting ellipses with the same principal axis on the plane are used as the calibration template, and a pair of vanishing points in the orthogonal direction are obtained by using the property of the quadratic curve, and the internal parameters of the camera are determined linearly. 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 geo...

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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