基于图像处理的电子白板定位技术

A New Whiteboard Positioning Technology Based on Image Processing

提出了一种由红外LED(固定点光源)、电子笔光源(可移动的点光源),及CCD组成的新型的电子白板定位系统。该系统采用CCD摄像器件来采集电子笔的运动轨迹,通过视频图像处理及定位算法求出电子笔点光源的二维坐标,实验结果表明了该算法的有效性及优越性。

With the development of multimedia, electronic whiteboard has been growing rapidly in the late 1990＇s, applied in the field of teaching. At the present stage of international and domestic markets, there are a variety of techniques to achieve precise positioning whiteboard. Electromagnetic induction, infrared, resistance, ultrasound, CCD technology, and so on are all representative of them. And each has different technical characteristics and advantages. In this paper, a new CCD-based device positioning technology, using the infrared LED as a fixed point light source and electronic pen （a moeable light source point）, with infrared CCD camera lens optical filtering device to capture electronic pen trajectories is presented. According to the analysis of the output, a new algorithm is designed to derive the two-dimensional coordinates of the point light sources.