principal axis of an ellipse
principal axis of an ellipse
椭圆的主轴
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The image of sphericity which does not located the principal optic axis is an ellipse based on pinhole model, and the image center offsets from the projection of the sphere center.
针孔成像模型下非主光轴上的球体成像为椭圆，椭圆中心偏离球心投影点。
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