通过介绍基于视觉的大屏幕定位方法, 解释了视觉触控的实现原理, 搭建了大屏幕触控系统。为了满足视觉触控定位精度的要求, 提出了对角线全屏分段标定方法, 并对标定点进行拟合计算, 完成了视觉多点触控系统的定位。实验证明, 在准确触控标定点的条件下, 基于视觉的大屏幕触控系统能够在距离屏幕上檐2 cm以外实现3个像素内的准确定位, 在距离屏幕上檐2 cm以内实现10个像素内的定位。

By introducing the big screen positioning method based on visual touch, the visual touch principle is expounded and large screen touch system is built. In order to meet the requirements of accurate positioning, the full screen diagonal segmented calibration method is proposed and calibration points are fitted, the positioning for optical multi-touch system is achieved. The experiments demonstrated that in conditions of touching calibration points accurately, the vision-based big screen touch system is able to achieve accurate positioning within 3 pixels when the area is 2 cm away from the up edge of the screen. Positioning can be reached within 10 pixels when the area is within 2 cm from the up edge of the screen.