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Information Technology Journal
Year: 2012  |  Volume: 11  |  Issue: 7  |  Page No.: 926 - 930

Solving the Camera Intrinsic Parameters with the Positive Tri-prism Based on the Circular Points

Yue Zhao, Xiaohua Hu, Xiaodan Lv and Hui Wang    

Abstract: This study proposed a method of camera self-calibration with the positive tri-prism. The coordinates of circular points can be obtained through the properties of positive tri-prism. According to the theory of projective transformation, the coordinates of the vanishing points of each edges of positive tri-prism can be obtained. After that, combined with the corollary of Laguerre theorem (the infinity points of two mutually perpendicular lines and the circular points harmonic conjugate), one can obtain the image coordinates of the circular points. By computing coordinates of whole the circular points in an image, according to the constraints on the intrinsic parameters which are established through image of the absolute-conic, we can obtain the intrinsic parameters linearly. The method algorithm has been tested on both computer simulated data and real data. The technique only required single target image and the orientation of camera did not need to be known. The results gained considerable robustness.

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