关键词: 摄像机标定, 彩色图像, 畸变系数, 畸变校正, 畸变率

Abstract: For the purpose of correcting the distortion of the large-field-of-view lens used on aerial cameras, this paper proposed a method using the Matlab calib_toolbox. By calibrating the captured images of a range of angles-of-view and distances, the internal parameters and distortion coefficients of the camera were obtained, and the correct mathematical model of distortion correction was built. The proposed method made an improvement on the Bouguet method, and extended its applications to distortion correction of color images for airborne cameras via subsequent programming. Furthermore, a new and efficient backstepping reconstruction pattern matching method for image-distortion-rate analysis was proposed, which quantified the level of distortion. The simulation results show that the proposed method reduces the distortion rate of color images averagely by about 10%. As all the experimental results indicate, the proposed method is simple and efficient, and it is convenient to be readily transplanted to hardware platform for real-time image distortion correction.

Key words: camera calibration, color image, distortion coefficient, distortion correction, distortion rate