正多边形是指二维平面内各边相等，各角也相等的多边形，也叫正多角形。
证明了任意正多边形光陀螺都具有同一形式的修正因子。
It has been proved that there exists the same correction factor for any polygonal optical gyro.
据此，可以由正多边形物体的正投影像提取原像的尺寸，实现物像关系的标定。
Therefore, the size of the equilateral polygon can be uniquely extracted by its front-projection image and the photogrammetric calibration can be done accordingly.
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