基于ARM的四摄像头光学触摸屏系统研制

Four camera optical touch screen system developed based on the ARM

针对目前超大触摸屏价格昂贵、通用性差的问题,采用图像识别技术构建了基于ARM的四摄像头光学触摸屏系统。系统通过安装在4个顶点的CMOS摄像头同步采集触摸屏区域图像,ARM微处理器对采集的图像进行触摸点检测,根据触点成像位置和摄像头标定得到触点的方向直线,最后通过计算任意两条直线相交于一点来确定触点的位置。实验表明,此系统对单点和两点触摸能达到99%的识别率,触点坐标位置误差小于2%。

Aiming at the large touch screen is expensive, poor universality limitations, four cameras optical touch screen system based on ARM is built using image recognition technology. System synchronously samples touch screen images by installed in 4 vertices of the CMOS camera, ARM microprocessor using touch point detection to acquired images, based on contact image position and camera demarcation to get contact direction of linear, finally, by calculating two arbitrary lines intersected in one point to deter-mine the contact position. Experiments show that this system of single point and two- point touch can achieve 99 % recognition rate and contact coordinates of the location error is less than 2 %.