Calibration of camera axis offset based on image analysis

For the problem that objects in image center is excursing while camera is zooming, this paper analyses the modeling and improves the traditional method. Based on the results, a calibration method of camera axis offset based on image analysis is put forward. Moreover, some optimizations are processed in the validation experiment by rectangular object imaging with different focal length, whose results show that the method could accurately calibrate the camera axis offset. After calibration of camera, axis deviation jitter is lower than 0.6% of view angle, which could provide facility for using camera under high precision situations.