A calibration technology for multi-camera system with various focal lengths

Calibration is the basis of three-dimensional (3D) reconstruction for machine vision technology. Nowadays, the most widely used calibration method among computer vision is the technique for binocular stereo measurement. However, binocular stereo vision has limited view field which is difficult to measure large-scale mechanical components synchronously. Thus, enlarging the view field is urgent in need for the large scale measurement. With the application of multi-camera system, the calibration for cameras with different focal lengths is required. In this paper, a method aiming at calibration problems for multi-camera system of different focal lengths is proposed. An imaging model for multi-camera system with various focal lengths is analyzed. The Harris corner detector is applied to determine the relationship between signal camera and checkerboard. Finally, the external parameters of different cameras can be obtained by the link with the checkerboard. The calibration results indicate that the calculation method used in this work can calibrate multi-camera with various focal lengths.

[1]  Peng Zhang,et al.  3D reconstruction for sinusoidal motion based on different feature detection algorithms , 2015, Precision Engineering Measurements and Instrumentation.

[2]  Roger Y. Tsai,et al.  A versatile camera calibration technique for high-accuracy 3D machine vision metrology using off-the-shelf TV cameras and lenses , 1987, IEEE J. Robotics Autom..

[3]  赵吉宾,et al.  Computer-based binocular vision false-tooth scanning device , 2009 .

[4]  J Xu.  Research of Camera Calibration Technology Based on Nonlinear Model , 2008 .

[5]  刘艳 Liu Yan,et al.  Reaserch of the improvement of Zhang's camera calibration method , 2014 .

[6]  Rangachar Kasturi,et al.  Machine vision , 1995 .

[7]  Liang Wang,et al.  Multi-Camera Calibration with One-Dimensional Object under General Motions , 2007, 2007 IEEE 11th International Conference on Computer Vision.

[8]  Zhengyou Zhang,et al.  A Flexible New Technique for Camera Calibration , 2000, IEEE Trans. Pattern Anal. Mach. Intell..

[9]  Hong Qiao,et al.  Overview of camera calibration for computer vision , 2014, Proceeding of the 11th World Congress on Intelligent Control and Automation.

[10]  Sergiu Nedevschi,et al.  Development of an omnidirectional stereo vision system , 2013, 2013 IEEE 9th International Conference on Intelligent Computer Communication and Processing (ICCP).

[11]  Hou Wenguang,et al.  3D Reconstruction of Human Head Based on Stereovision , 2007, 2007 1st International Conference on Bioinformatics and Biomedical Engineering.

[12]  Li Guo-hui.  A Calibration Technology for Multi-resolution Hybrid Camera System , 2012 .