Calibration of camera with wide field-of-view based on spliced small targets

In order to solve the problem that a large scale target is hard to fabricate in the high precision calibration of camera with wide field-of-view, a calibration method based on spliced small targets was proposed. In this method, small targets were placed in different positions in the field-of-view of the camera, and then a large scale target covering the whole field-of-view of the camera was spliced using the small targets on the basis of rigid transformation, while the respective constraints in the process of splicing were considered. Then the spliced large scale target was used to calibrate the camera with wide field-of-view. Simulation and real experiments results show that the precision of calibration with the spliced target is equivalent to the precision of calibration with real large scale target, indicating that the method proposed in this paper can achieve the high precision calibration for camera with wide field-of-view.