关键词: 坐标转换, 仿射变换, 透视变换, 单应性矩阵

Abstract: Aiming at the low precision and efficiency of common location algorithm based on coordinate conversion, this paper proposes a location algorithm based on perspective transformation principle. It defines a homography matrix which uniquely reflects space mapping relationship between points by the coordinate information of four original locations. After location, coordinate conversion can be finished through simple calculating by using this homography matrix. Experimental results show that this method is stable.

Key words: coordinate conversion, affine transformation, perspective transformation, homography matrix