【摘要】 将面阵电荷耦合器件(CCD)用于探测和跟踪指点特殊光点的位置,基于windows编程的应用软件建立了基于大屏幕显示的新型人机交互设备———“交互式电子白板”.利用视频同步信号分离的专门芯片以及处理用数字电路,通过对面阵CCD输出的全电视信号进行预处理以及逻辑时序运算可以得到光点像在CCD像面上的位置;通过坐标转换可以将得到的光点在CCD像面上的坐标转换为显示屏幕上的坐标;在应用软件支持下,可对计算机进行操作.实验结果表明,在特定指点笔的操作下,可以使任意的显示大屏幕转变为具有电子书写板和触控功能的虚拟大型触摸屏.更多还原

【Abstract】 A human-computer interactive device used for large screen display,interactive electronic whiteboard,was presented.Two-dimensional CCD was used to locate and trace the specific light-spot generated from a specific light-pen in the screen.With a video syn separator and through combinational and sequential logic processing of the full video signal outputted from CCD,the target spot’s position in the CCD’s sensitive layer was generated,then the spot’s relative coordinate in the screen was gained by coordinate transformation.With the coordinate and support of software based on message driving mechanism of Microsoft Window,computer can be controlled by the specific light-pen.With the specific lightpen,one can also take notes,shape his desire in the screen,etc;and the screen will be a virtual touch screen and an interactive whiteboard.更多还原