基于USB摄像头的激光笔辅助教学系统的设计与实现

DESIGN AND IMPLEMENTATION OF A USB-CAMERA-BASED COMPUTER AIDED INSTRUCTION SYSTEM WITH A LASER POINTER

实现一个利用激光笔与投影仪大屏幕进行互动的辅助教学系统。首先,通过USB摄像头检测激光亮点在屏幕上的位置。然后,通过计算机上的相应算法实现无线鼠标的功能,激光点轨迹的绘制,放大屏幕上的重要区域,清屏以及幻灯片的上下翻页功能。专门为这套辅助教学系统设计的激光笔使得教师在课堂里实现这种互动更为灵敏和连续。

The paper introduces an interactive computer aided instruction system with a laser pointer and a large screen casted by a projector.First the USB-camera detects the laser dot on the screen.Then such functions are carried out through corresponding algorithms as wireless mouse,laser path drawing,key region magnification on the screen,screen clearance and page-up/down of the slideshow etc.A laser pointer that is especially designed for the CAI system helps teachers achieve interaction on class more swiftly and continuously.