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A spherical object has been introduced into camera calibration for several years through utilizing the properties of an image conic, which is the projection of the occluding contour of a sphere in the perspective image. However, in literature, only an algebraic interpretation was presented for the relation between the image of the absolute conic and sphere images. In this paper, we propose two geometric interpretations of this relation and two novel camera calibration methods using sphere images are derived from these geometric interpretations.
Camera calibration, geometric interpretation, sphere image, image of the absolute conic, double-contact theorem.

X. Ying and H. Zha, "Geometric Interpretations of the Relation between the Image of the Absolute Conic and Sphere Images," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 28, no. , pp. 2031-2036, 2006.
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