基于平面二次曲线的摄像机标定

Planar Conic Based Camera Calibration

提出了一种基于平面二次曲线的摄像机标定方法 .该方法只需要摄像机在 2个或 2个以上不同的方位摄取一个含有 3个或 3个以上同心二次曲线的平面模板的图像 ,摄像机和平面模板都可以自由移动 .所提出的摄像机标定方法在求解过程中不需要非线性迭代 ,可以直接获得解析解 .由于该方法利用二次曲线作为标定基元 ,简化了基元对应问题 ,并且精度和稳定性都比较高 .另外该方法原理简单 ,对设备的要求比较低 ,非常适合对计算机视觉不太熟悉的人员使用 .

Inspired by the technique proposed by Zhang, this paper proposes a new easy camera calibration technique. The technique only requires the camera to observe a model plane shown at a few (at least two) different orientations. The model plane contains a few (at least three) concentric conics. Either the camera or the model plane can be freely moved and the motions need not be known. All computations involved are matrix operations in the linear algebra, and a closed form solution can be obtained. Since the conics are used as the calibration primitives, which are global features, the proposed technique is more robust and stable. Both computer simulation and real data are used to test the proposed technique. Compared with the classical techniques where an expensive calibration pattern is always used, this technique is easy to use and more flexible.