Omni-directional camera calibration
Tao Liu · Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University · 2009
In general,omni-directional camera calibration methods require special scene settings,expensive equipment,and a single viewpoint.To solve these problems,a method using a general sensor parameter model for hyperboloid omni-directional camera calibration was created based on the theory that the projection of a 3D real point onto a pixel of the image plane can be described by a Taylor series expansion.This model can compensate for any misalignment between the focal point of the mirror and the camera's optical center,and can be applied when a single viewpoint has not been met precisely.The proposed method only requires camera motion to be restricted to a planar pattern at a few different locations.Either the camera or the planar pattern can be freely moved without apriori knowledge of the motion,so the method is flexible.Model parameters are obtained by nonlinear optimization,giving it high accuracy.