摘要
目前投影仪和大屏幕应用广泛,但传统的基于键盘和鼠标的人机交互将演讲者束缚在计算机旁,不能实现演讲者与听众近距离交流。为解决此问题,提出一种激光笔交互式输入系统。利用CCD摄像头拍摄投影屏幕,通过视频采集卡传送到计算机并进行实时处理,计算出屏幕的坐标,采用Windows API函数实现对屏幕内容的标注等功能。在激光笔投影点坐标提取部分,针对以往背景更新算法无法适应场景光照条件快速变化的问题,提出了自适应背景更新算法。实验结果表明,该系统操纵方便,具有较强的实用性和适应性。
Projectors and large screens are used widely at present.In most cases,the speaker is confined to the side of the computer because the traditional human-computer interactions are realized with keyboard and mouse.To solve this problem,a laser pen interaction input system is presented.Use CCD camera to image the projection screen at first,then transfer the video to computer via capture card and process it real-timely,calculate the screen coordinates and use Windows API functions to mark the screen contents.In the part of laser pen projection point coordinates extraction,it is put forward the adaptive background updates algorithm.Experimental results show that this system has the advantages of convenient operation,strong practicability and wide adaptability.
出处
《激光与红外》
CAS
CSCD
北大核心
2011年第11期1282-1286,共5页
Laser & Infrared
关键词
激光笔
CCD
目标检测
自适应背景更新
laser pen
CCD camera
target detection
adaptive background updates
