四路摄像头协同多重触控系统标定方法  

Calibration Methods for the Multi-touch System Based on Four Collaborative Cameras

作　　者：谢斐[1] 蔡山[1] 王德鑫[1] 陈超[1] 

机构地区：[1]国防科学技术大学信息系统与管理学院信息系统工程重点实验室,长沙410073

出　　处：《计算机科学》2011年第9期253-256,263,共5页Computer Science

基　　金：863高技术研究发展计划(2009AA01Z328);国家自然科学基金(60705013;60773023)资助

摘　　要：四路摄像头协同多重触控系统通过拟合四路摄像头得到触点方向线,以解决多触点遮挡问题。针对该原理中触点方向线构建问题,提出查找表法、消失点法和立体标定法3种系统标定方法,以实现多触点精确定位。查找表法在交互区边框上设定标定点,通过插值查找对应标定点,以光心和标定点构建触点方向线;消失点法利用触点方向上的消失点和光心构建触点方向线;立体标定法利用极线几何反投影射线构建触点方向线。误差分析实验结果表明,查找表法适用于较小尺寸平台,消失点法适用于大尺寸平台,立体标定方法精度有待提高。The multi touch system using four cameras solves the occlusion by fitting the four directing lines of each touch point.This paper presented three methods to build the directing line,including look-up table method,vanishing point method and stereo calibration method.The look-up table method stations a set of reference points along the rectangle frame,finds the closest reference point by interpolation,and builds the line according to the projection center and the reference point;the vanishing point method builds the directing line according to the vanishing point of the touch point and the projection center;stereo calibration method builds the directing line according to epipolar geometry back projection line.Results show that look up table is applicable to small platforms and vanishing point method fits large size platforms while stereo calibration method needs to improve the precision.

关 键 词：人机交互 多重触控 查找表法 消失点法 立体标定法 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]