A method for calibrating camera lens distortion with cross-ratio invariability in welding seam system
Zhao, Guangtao; Qiao, Hong
Conference Name1st International Conference Intelligent Robotics and Applications
Conference DateOCT 15-17, 2008
Conference PlaceWuhan, PEOPLES R CHINA
AbstractWide-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.
KeywordCamera Calibration Radial Distortion Decentering Distortion Cross-ratio Invariability Wide-angle Lens
Document Type会议论文
Corresponding AuthorQiao, Hong
AffiliationChinese Acad Sci, Inst Automat
Recommended Citation
GB/T 7714
Zhao, Guangtao,Qiao, Hong. A method for calibrating camera lens distortion with cross-ratio invariability in welding seam system[C],2008.
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