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Green Image
Issue No. 12 - December (2008 vol. 30)
ISSN: 0162-8828
pp: 2243-2248
Kwan-Yee K. Wong , The University of Hong Kong, Hong Kong
Guoqiang Zhang , The University of Hong Kong, Hong Kong
Chen Liang , The University of Hong Kong, Hong Kong
Hui Zhang , United International College, Tangjiawan, Zhuhai, Guangdong
This paper proposes a novel method for robustly recovering the camera geometry of an uncalibrated image sequence taken under circular motion. Under circular motion, all the camera centers lie on a circle and the mapping from the plane containing this circle to the horizon line observed in the image can be modelled as a 1D projection. A 2x2 homography is introduced in this paper to relate the projections of the camera centers in two 1D views. It is shown that the two imaged circular points of the motion plane and the rotation angle between the two views can be derived directly from such a homography. This way of recovering the imaged circular points and rotation angles is intrinsically a multiple view approach, as all the sequence geometry embedded in the epipoles is exploited in the estimation of the homography for each view pair. This results in a more robust method compared to those computing the rotation angles using adjacent views only. The proposed method has been applied to self-calibrate turntable sequences using either point features or silhouettes, and highly accurate results have been achieved.
Camera calibration, Imaging geometry, 3D/stereo scene analysis

C. Liang, K. K. Wong, H. Zhang and G. Zhang, "1D Camera Geometry and Its Application to the Self-Calibration of Circular Motion Sequences," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 30, no. , pp. 2243-2248, 2008.
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