It's the dot product between the normal vector of a plane and the vector along the line.
这是平面法向量，和沿直线向量的点积。
A line segment connecting this feature point and the corresponding point is a parallax vector.
连接此特征点和对应点的线段是视差矢量。
A new estimation method of arrival direction is proposed using a line array of vector hydrophones.
提出了采用矢量水听器线列阵得二维波达估计方法。
Application of vector method to problems involving parallelism, perpendicularity and division of a line segment.
应用向量方法以解平行，垂直及线段之分割等问题。
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