The analysis and summarization, the projection character of Angle bisector is proved on theory.

通过对角平分线投影特性的分析、总结，从理论上证明了角平分线投影特性。

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To study the intersection visibility of two general place planes, this paper set the planes as two faces of front and backs from the point of projection character of a space plane.

为了研究两平面相交可见性的规律，从空间一个平面的投影特点入手，将平面分别设定为正面、背面两面，讨论平面图形各顶点投影顺序与平面正面、背面的投影所具有的内在规律。

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We present a method to construct image feature vector using edge and projection of character image. The composing way and normalizing of feature vector are shown.

然后进一步提出根据图像边缘和字符投影特征构造图像特征矢量的思想，以及特征矢量的构成方式和归一化方法。

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