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| Geometric Interpretations and Applications of the Extrinsic Parameters Derived from the Camera Calibration Based on Spheres |
| JIA Jing,JIANG Guang,WU Cheng-Ke |
| The State Key Laboratory of Integrated Services Networks,Xidian University,Xian 710071 |
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Abstract Camera calibration based on spheres has been lucubrated in recent years. The geometric relationship between the projections of spheres and absolute conic (IAC) are reinterpreted in this paper. The geometric meaning between spheres and the extrinsic parameters is presented. A method for calculating the sphere centers based on the orthogonal decomposition is put forward. Compared with the existing methods, the proposed method is clear and simple. A method by using three spheres to calculate the camera extrinsic parameters is proposed as well. Experimental results show the two methods have high precision and can be widely applied in visual platform for parameters calculation of camera motion.
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Received: 30 June 2009
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2010, Vol. 23 
