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.
贾静，姜光，吴成柯. 圆球标定中相机外参数的几何解释和应用[J]. 模式识别与人工智能, 2010, 23(2): 160-164.
JIA Jing,JIANG Guang,WU Cheng-Ke. Geometric Interpretations and Applications of the Extrinsic Parameters Derived from the Camera Calibration Based on Spheres. , 2010, 23(2): 160-164.
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2010, Vol. 23 
