上海交通大学学报

上海交通大学学报（自然版） ›› 2015, Vol. 49 ›› Issue (03): 366-370.

• 自动化技术、计算机技术 • 上一篇    下一篇

由任意平行四边形确定摄像机内参数的方法

王秀平1,2,白瑞林1,刘子腾1   

  1. (1. 江南大学 轻工过程先进控制教育部重点实验室， 江苏 无锡 214122；2. 无锡科技职业学院， 江苏 无锡 214028)
  • 收稿日期:2014-07-08 出版日期:2015-03-30 发布日期:2015-03-30
  • 基金资助:

    江苏省自然科学基金项目(BK20141115)，江苏省产学研前瞻性联合研究项目（BY2012056）资助

A Novel Approach for Determining Intrinsic Parameters of Camera Using Two Parallelograms

WANG Xiuping1,2,BAI Ruilin1,LIU Ziteng1   

  1. (1. Key Laboratory of Advanced Process Control for Light Industry of the Ministry of Education，Jiangnan University, Wuxi 214122, Jiangsu, China;2. Wuxi Professional College of Science and Technology， Wuxi 214028， Jiangsu, China)
  • Received:2014-07-08 Online:2015-03-30 Published:2015-03-30

摘要：

摘要：  根据交比与角度之间的联系，提出了一种由任意平行四边形标定摄像机内参数的线性方法.采用关于空间平面上平行四边形的2种不同方案,运用拉盖尔定理和交比不变性原理,计算2个圆环点的图像坐标，再利用圆环点在绝对二次曲线上这一特点来线性标定摄像机内参数，完成标定只需3幅图像.文章将以往通过正交直线求圆环点的方法进行了扩展，采用任意斜交直线也可求圆环点，因而具有更广泛的适用性.模拟实验和真实图像实验均证明了该方法的可行性.

关键词: 机器视觉, 摄像机内参数, 平行四边形, 标定, 交比不变性

Abstract:

Abstract： According to the relationship between crossratio and angle, a novel linear approach was proposed to determine the  intrinsic parameters of the camera. The image coordinates of the two circular points were derived from two different methods concerning the images of two parallelograms using the Laguerre theorem and the invariance of crossratio. Then the intrinsic parameters of the camera are linearly calibrated from three images of parallelograms according to the circular points which are in the absolute conic(AC). Compared with the calibration method based on rectangles, this approach further weakens the required conditions. Therefore, it has a wide applicability. Extensive simulations and experimental results with real images show that the proposed approach is practicable.

Key words: computer vision； camera intrinsic parameter； parallelogram； calibration； cross-ratio invariance

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