高速高精度的几何校正是构建投影显示系统的关键环节, 对于由大量投影机组成的全景显示系统来说显得尤为重要。针对此, 提出了基于鱼眼相机的几何校正方法并给出了理论推导。该方法首先对鱼眼相机进行标定, 然后通过拍摄投影到显示墙的结构光特征条纹构建投影机与相机间的亚像素级映射关系, 进而计算出每个投影通道的几何校正数据。实验结果表明: 所提方法可为大规模全景显示系统提供高速高精度的解决方案, 具有很好的实际应用价值。

The high-speed and high-accuracy geometric calibration is the key step for building projection display system, which is especially important for the panoramic display system that composed of a large number of projectors. In response to this, a geometric calibration method based on fisheye camera is proposed and its theoretical derivation is given. The proposed method firstly calibrates the fisheye camera, and then builds the sub-pixel level mapping relationship between projector and camera through capturing the structured light feature fringes on the display wall. Finally, the geometric calibration data for each projection channel is calculated. Experimental results show that the proposed method can provide a high-speed and high-accuracy solution for large-scale panoramic display system, and it has a good application value.