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基于二次曲线的纯旋转摄像机自标定
引用本文:杨长江,孙凤梅,胡占义.基于二次曲线的纯旋转摄像机自标定[J].自动化学报,2001,27(3):310-317.
作者姓名:杨长江  孙凤梅  胡占义
作者单位:1.中国科学院自动化研究所模式识别国家重点实验室,北京;
基金项目:国家自然科学基金!( 699750 2 1 ),国家“八六三”高技术发展计划!( 863-51 2 -98-2 0 -0 3),国家“九七三”计划!( G1 9980 30 50 2
摘    要:研究探讨了一种基于平面二次曲线的纯旋转摄像机自标定方法.在不同的方位拍摄 三幅或三幅以上图像,每幅图像至少包含两个空间平面二次曲线、或两个二次曲面、或一个平 面二次曲线与一个二次曲面的投影,利用图像之间的二次曲线对应关系,可以确定摄像机的 内参数矩阵,同时可以获得摄像机不同方位之间的旋转矩阵.由于使用的定标基元为二次曲 线,是较点和直线包含更多信息的基元,因而基元之间的匹配容易自动实现,并有助于提高标 定算法的鲁棒性和在线实时性.模拟实验和真实图像实验表明文中所介绍的方法是可行的.

关 键 词:摄像机自标定    二次曲线(面)    单应性矩阵
收稿时间:1999-7-30
修稿时间:1999年7月30日

Self-Calibration of Rotating Cameras Using Conic Correspondences
YANG Chang-Jiang,SUN Feng-Mei,HU Zhan-Yi.Self-Calibration of Rotating Cameras Using Conic Correspondences[J].Acta Automatica Sinica,2001,27(3):310-317.
Authors:YANG Chang-Jiang  SUN Feng-Mei  HU Zhan-Yi
Affiliation:1.National Laboratory of Pattern Recognition,Institue of Automation,Chinese Academy of Sciences,Beijing;College of Fundamental Research,North China University of Technology,Beijing
Abstract:In this paper, instead of corresponding image points which are widely used in the literature, corresponding image conics are used to calibrate a rotating camera. An image conic can be the projection of either a planar conic or silhouette of a conicoid. We show that at least three images, taken from the same position with different camera orientations, of two planar conics, or two conicoids, or one conic and one conicoid, are needed for the calibration, and a closed form solution can be obtained. Our new conic based calibration technique requires no knowledge of camera's orientations, and relies solely on image correspondences. Since a conic contains more useful information than a line or a point, it is much easier to establish feature correspondences . In addition, it is also helpful to improve the robustness of calibration. Both computer simulation and experiments with real images are done to validate our new technique.
Keywords:Camera self  calibration  conic(conicoid)  homography    
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