本文以射影变换下的复比不变性为理论基础，设计了一种可基于形状信息进行视觉识别的灰度人工路标。
Based on invariance of the cross-ratio in projective transformation, this paper designed a gray artificial landmark for vision-based recognition by shape information.
交比是和射影变换有关的一个基本不变量，利用交比不变性的计算来揭示场景的本质特征也是计算机视觉研究的一个热点。
To discover intrinsic properties of a scene by using the computation of cross ratio invariance has been one of the most hot research areas in computer vision fields.
单视图测量理论主要是利用了射影几何中的交比不变性来计算图像上点的三维坐标。
Single view metrology compute the 3d coordinate of a point based on the projective geometry's characteristic of cross-ratio invariability.
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