In order to improve the flexibility of multi-camera calibration and the diversity of calibration boards, the polar coordinate system is used to design the calibration board, and the camera calibration is based on the board. The feature points in the world coordinate are assigned by the designed board, and the positions of the feature points in the image coordinate are identified accordingly. The camera are calibrated after mapping the positions of the feature points in the image coordinate and the world coordinate. The calibration method only requires small sets of correspondences ( about 20 pairs) , and, meanwhile, it can ensure the accuracy and robustness. Small sets of correspondences and the diversity of images can avoid the blocking and inadequate public spaces for multi-camera calibration, which is helpful for the multi-camera calibration. It is more flexible than the traditional multi-camera calibration on the distribution of cameras and boards. Compared with the traditional method with accurate board, the calibration board design and the calibration system are simpler to achieve and they can also ensure the accuracy.
camera calibrationpolar coordinatemulti-camera calibrationflexible planar patternmachine vision
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