In large-scale imaging or measurement, a rotating photogrammetric system with a camera fixed on the surface of the turntable can be used to extend the field of view of the camera with the rotation of the turntable. The camera’s projection center needs to be located at the rotation axis of the turntable, so the images captured during the sequentially rotating share the same projection center. It is very convenient to merge the subimages into a panoramic image. Due to the complexity of the camera’s lens system, the position of the projection center is usually unknown, which makes it difficult to find the projection center and align it with the rotation axis of the turntable. We propose a method to find the distance and azimuth angle between the projection center and rotation axis to solve the alignment problem using the parameters of the camera. In theory, as long as the intrinsic and extrinsic parameters of the camera are known, the distance and angle can be obtained by rotating the turntable once. With the translation values calculated from the distance and angle, the camera can be moved in two directions perpendicular to each other, so its projection center passes through the rotation axis. The theoretical analysis of the alignment problem is given. Experiments verify the feasibility of the proposed method are conducted. The alignment uncertainty of the proposed method is <0.2 mm.

中文翻译：

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旋转摄影测量系统中的轴对齐方法

在大尺度成像或测量中，可采用旋转摄影测量系统，相机固定在转台表面，随着转台的旋转，可以扩大相机的视野。相机的投影中心需要位于转盘的旋转轴上，因此依次旋转拍摄的图像共享同一个投影中心。将子图合并成全景图非常方便。由于相机镜头系统的复杂性，投影中心的位置通常是未知的，这使得很难找到投影中心并将其与转盘的旋转轴对齐。我们提出了一种通过相机参数求出投影中心与旋转轴之间的距离和方位角的方法来解决对齐问题。理论上，只要知道相机的内参和外参，转盘旋转一次就可以得到距离和角度。根据距离和角度计算出的平移值，相机可以在相互垂直的两个方向上移动，因此其投影中心通过旋转轴。给出了对齐问题的理论分析。实验验证了所提出方法的可行性。所提出方法的对准不确定度<0.2 mm。所以它的投影中心穿过旋转轴。给出了对齐问题的理论分析。实验验证了所提出方法的可行性。所提出方法的对准不确定度<0.2 mm。所以它的投影中心穿过旋转轴。给出了对齐问题的理论分析。实验验证了所提出方法的可行性。所提出方法的对准不确定度<0.2 mm。