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Kuo-Yang Tu
Institute of System Information and Control
National Kaohsiung First University of Science and Technology
Kaohsiung, 811 Taiwan
The studies on omnidirectional cameras usually focus on design and/or development
of the complicated structure for a wide range of view. However, difficult calibration and
expensive cost arisen from the complicated structure of omnidirectional cameras are considerable.
In this paper, imprecise parameters resulted from missing calibration of the reflective
mirrors of various profiles in omnidirectional cameras are studied. The relationship
between an object surface and an image plane, related to camera parameters, is thus
derived. In addition, an algorithm of more perfect unwarped images in omnidirectional
cameras is proposed. In practical, it is difficult and costly to make an omnidirectional
camera consisted of the reflective mirrors of various profiles. Therefore, a simulator
based on the derived relationship is designed to compare the omnidirectional camera of
various profile mirrors influenced by parameter variations. There are five kinds of reflective
mirrors with distinct profiles, spherical, parabolic, conical, tangent and sine, respectively,
compared in same size. In addition, the profile to compare the variation of these
five mirrors is included.
Received June 27, 2007; revised April 2 & June 16 & August 26, 2008; accepted September 11, 2008.
Communicated by Pau-Choo Chung.
* This paper was partially supported by the National Science Council of Taiwan, R.O.C. under grants No. NSC
94-2213-E-327-014-.