A camera calibration method based on the flexible spliced two-dimensional target is proposed to overcome the problems in the camera calibration that a large scale target with high precision is hard to fabricate and the smaller one cannot satisfy the required accuracy. The flexible spliced two-dimensional target consists of many small planar targets (called sub-target),and each sub-target includes a matching area and an extending area. Those sub-targets are combined into a virtual large scale planar target (called mother-target) by encode in the matching area and the camera parameters are calibrated by the mother-target. Simulation and real experiment results indicate that the accuracy of the proposed calibration method is almost the same as that of Zhang's calibration method using a large planar target with the point numbers similar to that of the flexible spliced two-dimensional target. The relative error of the two calibration method is less than 2％. This method shows his advantages in that the target is convenient to be fabricated, and the area of target can be extended infinitely.%针对大视场摄像机标定中高精度大尺寸靶标加工困难,小尺寸靶标标定精度不高的问题,提出了一种二维柔性拼接标定方法.二维柔性拼接靶标由多个小平面标定板(又称为子标定板)组成,每个子标定板平面上分为匹配区和扩展区,其中匹配区由编码点组成,多个子标定板通过编码点进行匹配,虚拟拼接成一个大面积的平面靶标(又称为母标定板),通过计算可以得到母标定板上的坐标值及其相应的像点,从而可以标定出摄像机的内参数.仿真和实验结果表明,该方法和大面积的靶标标定的精度相当,当大面积标定板上的标志点和子标定板扩展区标志点数相同时,其标定相对误差为2%左右.该方法的优点在于制备标定板灵活方便,可以无限制地扩展标定面积.
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