A method for calibrating camera lens distortion with cross-ratio invariability in welding seam system

CASIA OpenIR > 多模态人工智能系统全国重点实验室 > 机器人理论与应用

	A method for calibrating camera lens distortion with cross-ratio invariability in welding seam system
	Zhao, Guangtao; Qiao, Hong
	2008
会议名称	1st International Conference Intelligent Robotics and Applications
会议录名称	INTELLIGENT ROBOTICS AND APPLICATIONS
会议日期	OCT 15-17, 2008
会议地点	Wuhan, PEOPLES R CHINA
摘要	Wide-Angle tenses have broad applications in lots of fields for their larger fields of view. However, image deformation is its main backward. Thus, calibration of distortion parameters of wide-angle lens is an essential procedure for 3D information recovering from 2D images in applications. Based on our 3D welding seam extraction system, we propose a nonlinear calibration method by using calibration grid. This simple method only considers the distortion parameters so that the coupling between internal and external parameters of the camera is avoided. Moreover, it needs only feature point series which satisfy cross-ratio invariability, and need not know the exact position coordinates of the points. The nonlinear optimization is fast since the initial value of the distortion parameters can be obtained with cross-ratio invariability. Experiments show the efficiency and practicality of our method directly.
关键词	Camera Calibration Radial Distortion Decentering Distortion Cross-ratio Invariability Wide-angle Lens
文献类型	会议论文
条目标识符	http://ir.ia.ac.cn/handle/173211/12811
专题	多模态人工智能系统全国重点实验室_机器人理论与应用
通讯作者	Qiao, Hong
作者单位	Chinese Acad Sci, Inst Automat
推荐引用方式 GB/T 7714	Zhao, Guangtao,Qiao, Hong. A method for calibrating camera lens distortion with cross-ratio invariability in welding seam system[C],2008.