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3d line parameterization

三维直线参数化,一般情况空间直线用plucker参数化(n,d)表示,但存在n与d垂直的约束,在优化问题中存在过参数化的问题。针对该问题可以用orth param和cayley param两种参数表示的形式。参考论文"Line-based Monocular Graph SLAM "