Catadioptric Camera Calibration Using Geometric Invariants
IEEE Transactions on Pattern Analysis and Machine Intelligence
A Flexible Technique for Accurate Omnidirectional Camera Calibration and Structure from Motion
ICVS '06 Proceedings of the Fourth IEEE International Conference on Computer Vision Systems
International Journal of Computer Vision
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This paper presents an automatic method for detecting the conics from an omnidirectional image and use the conics for camera calibration. The method assumes the camera system is orientated in a way that the mirror axis is orthogonal to the floor. In this way two special cases of parallel lines can be obtained: one set of lines are orthogonal to the mirror axis; and the other set is lines that are coplanar with the mirror axis. Based on these special lines' geometric properties under central catadioptric projection, we show that automatic calibration of catadioptric from a single image can be achieved. The experiment results show that the method not only improve the accuracy of the conic fitting in the image but also provide robustness against conic occlusion and noise.