... 向量矩阵 vector matrix 向量绝对值 absolute value of a vector 向量空间 vector space ...
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The other kind of feature points are those where the absolute value of the scalar product of its normal vector and the view vector is less than a threshold.
另一类特征点是由法向量和视线向量的内积决定的，内积小于给定阈值的点称为特征点。
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