Research on calibration technology of fisheye imaging system
In order to solve the problem of poor target localization accuracy in a large field of view fisheye imaging system,a research method based on camera movement to calibrate the imaging model of the fisheye imaging system was adopted.The calibration object was a single fixed point light source,and the fisheye imaging system was driven to move by a motorized high-precision 2-D turntable to record the orientation angle of the point light source in the fisheye imaging system and the pixel position of the light point in the image,respectively,to construct a calibration model of the fisheye imaging system so that the point light source was imaged at each position in the image;the optical center was calculated by using the edge-fitting circle of the effective area of the image,and the aberration parameters were calculated by using the sub-regional calibration method to reduce the calibration error.The results show that when divided into three regions for calibration,the calibration error of the method in the central imaging region is 0.06°.This method has a high accuracy and can be applied to the calibration of large field-of-view fisheye imaging systems such as infrared earth sensors and wide-angle imaging reconnaissance systems.
imaging systemscalibrationaberrationoptical centercamera movement
万方数据
维普
