Calibration of Camera Parameters with the Radial Distotion for the GRB Robot Vision System

A nonlinear camera model with one order radial distortion is established for the GRB-400 robot vision system in this paper. Firstly, the coordinates of the calibrated image are collected by Matrox image acquisition card, and then distortion parameters of camera are worked out by the established linear equation based on radial alignment constraint (RAC). The image is corrected by the distortion parameters, which can improve the location accuracy of target object. At same time, the robustness of robot vision systems is improved when camera calibration parameters change. The experimental results show that this method has higher precision in the calibration.