Bear in mind that the chief ray is now principal ray . 记住，此时主光线就是主点光线。
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The principal points of a thin lens coincide at the center of the lens . 薄透镜的两个主点与透镜中心相重合。
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Secondary principal point 第二主点
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Primary principal point 第一主点
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Ground principle point 地面主点
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Closest approach point 照准主点
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In this paper , we discussed the self - calibration method that no skew is present and the principal point is close to the center of the image but the focal length can be changed freely 本文讨论了在摄像机不存在畸变、主点已知而其它参数可以改变时的自定标算法。
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Abstract : the paper analyzed the properties of concentric curve , theprinciple and method of setting out stakes of middle - line & sidings on one random station and closed with main points 文摘:分析了同心曲线的性质，提出了可在任意点设站测设同心曲线的原理及放样同心曲线的中线、侧线各桩并闭合于各自主点的方法
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Both methods provide good performance , and the latter is better since it can give a better describing of the residual distribution of matches . in the study of camera self - calibration , firstly , based on discussion of using and the selecting of scene constraints , two new robust vanishing point estimation algorithms are presented . one is based on peransac , and the other is based on clustering 在相机自定标技术的研究中,首先,在讨论利用和选择景物约束的基础上,提出两个新的消失点估计算法:基于peransac的估计算法和基于聚类分析的估计算法,后者在估计精度上优于前者;其次,提出了综合利用空间平行线约束和相机主点位置约束的线性迭代自定标方法,提高了相机自定标的鲁棒性。
