A method of close-range calibration of fisheye lens camera

Fish-eye lens provide ultra-wide field of view, however cause obvious image distortion. The paper provides a close range fisheye lens camera model which reflects the relationship between imaging distortion and object distance. In the model, three camera images shot at various object distances in close range are sufficient to achieve the camera calibration. The experiment demonstrated that the accuracy of image correction was obviously promoted because influence of object distances was well considered, especially in macroshot.