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2013 (Vol. 6, Issue: 08)
Article Information:

An Approach for Self-Calibration by a Quartered Circle

Yue Zhao and Xiaodan Lv
Corresponding Author:  Yue Zhao 

Key words:  Circular points, cross-ratio, polarity principle, vanishing line, quartered circle, ,
Vol. 6 , (08): 1457-1461
Submitted Accepted Published
October 31, 2012 December 22, 2012 July 10, 2013

The camera calibration is a key step for converting a projective reconstruction into a metric one, which is equivalent to recovering the unknown intrinsic parameters with each image. A circle is a common geometric primitive for the camera self-calibration. To avoid the limit of circle center to the camera self-calibration in a planar template, a method how to solve out the vanishing line is proposed. Then using the property of vanishing line, the camera intrinsic parameters are figured out and the camera self-calibration is achieved. The template contains a quartered circle in the study. Firstly, the camera is used to take photographs of the template from three or more direction. Secondly, using the ellipse and two mutually perpendicular diameters which are extracted from the image, according to the polarity principle and making use of the invariant property of cross-ratio of four lines which are intersected in one same point, the vanishing line can be solved out. In the end, the circular points can be figured out by the intersection between vanishing line and the circle. And using the property of the circular points, the self-calibration is realized.
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  Cite this Reference:
Yue Zhao and Xiaodan Lv, 2013. An Approach for Self-Calibration by a Quartered Circle.  Research Journal of Applied Sciences, Engineering and Technology, 6(08): 1457-1461.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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