交互式电子白板的坐标转换算法

针对常用坐标转换定位算法精确度和效率较低的问题，提出一种基于透视变换原理的定位算法。根据4个初始定位点的坐标信息，确定反映点与点之间空间映射关系的单应性矩阵。定位完成后，利用该矩阵进行简单运算即可完成坐标转换。实验结果证明该方法稳定性较高。

Coordinate Conversion Algorithm for Interactive Electron Smart Board

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.