直线畸变：所有三款镜子表现了中等程度的枕形畸变，作为补偿滚球效应的普通措施，并且能提供平滑的视场盘。
Rectilinear distortion: All three binoculars show a moderate amount of pincushion distortion as it is commonly employed to compensate for the globe effect and to provide a smooth panning of the image.
每个测量线必须被放置在沿着一个图像里的直线，这条线应该是直线，但由于透镜畸变实际上是弯曲的。
Each measurement line must be placed along an image line that should be straight, but because of lens distortion is actually curved.
利用标定物直线边缘的图像，并运用优化的方法来计算成像系统的畸变系数和主点位置。
According to image of linear edges in calibration object, the distortion coefficient and position of principal point of imaging system can be calculated by optimization method.
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