TY - GEN
T1 - A method for calibrating camera lens distortion with cross-ratio invariability in welding seam system
AU - Zhao, Guangtao
AU - Qiao, Hong
PY - 2008
Y1 - 2008
N2 - Wide-Angle lenses 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.
AB - Wide-Angle lenses 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.
KW - Camera calibration
KW - Cross-ratio invariability
KW - Decentering distortion
KW - Radial distortion
KW - Wide-angle lens
UR - https://www.scopus.com/pages/publications/56749146174
U2 - 10.1007/978-3-540-88518-4_67
DO - 10.1007/978-3-540-88518-4_67
M3 - 会议稿件
AN - SCOPUS:56749146174
SN - 3540885161
SN - 9783540885160
T3 - Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
SP - 620
EP - 629
BT - Intelligent Robotics and Applications - First International Conference, ICIRA 2008, Proceedings
T2 - 1st International Conference on Intelligent Robotics and Applications, ICIRA 2008
Y2 - 15 October 2008 through 17 October 2008
ER -