用x射线形貌术确定了直型反相畴界的平移矢量；
The translation vector of straight shape APB's is determined with X-ray topography.
该方法仅需4对消隐点象面坐标便可线性求解出旋转矩阵，再用2个空间点坐标便可线性求解出平移矢量。
The rotation matrix can be linearly acquired by using only 4 vanishing points and the translation vector can be linearly solved by using only 2 spatial point objects.
利用差分平移和差分扩张，提出一种新的应用于数字矢量地图的可逆水印算法。
Based on the difference expansion and difference shifting, a novel reversible watermarking algorithm for digital vector map is proposed.
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