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计算机工程 ›› 2010, Vol. 36 ›› Issue (20): 259-261. doi: 10.3969/j.issn.1000-3428.2010.20.090

• 开发研究与设计技术 • 上一篇    下一篇

交互式电子白板的坐标转换算法

黄小辉,张兴超,刘献忠   

  1. (华东师范大学软件学院,上海 200062)
  • 出版日期:2010-10-20 发布日期:2010-10-18
  • 作者简介:黄小辉(1983-),男,硕士研究生,主研方向:无线传感器网络;张兴超,硕士研究生;刘献忠,副教授
  • 基金资助:
    上海市科学技术委员会基地建设基金资助项目(07dz22107)

Coordinate Conversion Algorithm for Interactive Electron Smart Board

HUANG Xiao-hui, ZHANG Xing-chao, LIU Xian-zhong   

  1. (School of Software Engineering, East China Normal University, Shanghai 200062, China)
  • Online:2010-10-20 Published:2010-10-18

摘要: 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。

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

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