基于小靶标拼接的大视场摄像机标定方法

为了解决在大视场摄像机高精度标定中大尺寸靶标难以制作加工的问题，提出了一种基于小靶标拼接的大视场摄像机标定方法。该方法将小靶标在摄像机视场内多个位置进行摆放，通过各个小靶标之间的刚体变换，并考虑拼接过程中存在的约束条件，将各个小靶标拼接成一个覆盖整个摄像机视场的大靶标，然后使用该大靶标对大视场摄像机进行标定。仿真和实际实验表明该方法标定精度与使用实际大靶标进行标定时标定精度相当，能够实现对大视场摄像机的高精度标定。

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.