Focal Length Self-calibration Based on Degenerated Kruppa's Equations: Method and Evaluation (WP-P6)

Author(s) : Weilun Lao (Institute for Infocomm Research, Singapore) Zhaolin Cheng (Department of Mechanical Engineering, National University of Singapore, Singapore) Alvin Kam (Institute for Infocomm Research, Singapore) Tele Tan (Department of Computing, Curtin University of Technology, Australia) Ashraf Kassim (Department of Electrical and Computer Engineering, National University of Singapore, Singapore)

Abstract : In this paper, a linear self-calibration approach for camera focal length estimation is proposed. No priori information of camera motion is needed for the method. The unknown focal length of camera is conveniently obtained in closed form from degenerated Kruppa¡¯s equations. These degenerated equations (one quadratic and two linear) provide the essential constraints on calibration of camera intrinsic parameters. Real images of indoor and outdoor generic scenes and 3D metric reconstruction are used to analyze the accuracy of the estimated focal length. Experiments results show that the method is both robust and efficient.

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