Flexible camera calibration by viewing a plane from unknown orientations-英文文献.pdf

To appear in the Proceedings of ICCV’99 Flexible Camera Calibration By Viewing a Plane From Unknown Orientations Zhengyou Zhang Microsoft Research, One Microsoft Way, Redmond, WA 98052-6399, USA zhang@ /˜zhang Abstract one camera displacement by using image information alone. Therefore, if images are taken by the same camera with fixed We propose a flexible new technique to easily calibrate internal parameters, correspondences between three images a camera. It only requires the camera to observe a planar are sufficient to recover both the internal and external pa- pattern shown at a few (at least two) different orientations. rameters which allow us to reconstruct 3-D structure up to Either the camera or the planar pattern can be freely moved. a similarity [14, 12]. While this approach is very flexible, it The motion need not be known. Radial lens distortion is is not yet mature [1]. Because there are many parameters to modeled. The proposed procedure consists of a closed-form estimate, we cannot always obtain reliable results. solution, followed by a nonlinear refinement based on the Other techniques exist: vanishing points for orthogonal maximum likelihood criterion. Both computer simulation directions [3, 13], and calibration from pure rotation [10, 18]. and real data have been used to test the proposed technique, Our current