一、前言由于计算机和人之间的结合日益密切,在研制输出显示系统的同时,也希望研制从人向计算机传递信息的输入装置。特别是通过两维图形和计算机交换信息的图形输入装置,由于能够以人们习惯的手写方式输入信息,在计算机辅助设计及计算机辅助教学等领域中,就成为实时处理手写文字、图形的必须的工具。 I. INTRODUCTION Due to the increasingly close integration between computer and human being, while developing an output display system, it is also hoped to develop an input device for transmitting information from a human to a computer. In particular, a graphical input device for exchanging information between two-dimensional graphics and a computer can input information in a hand-written manner that people are accustomed to and become an indispensable tool for processing handwritten characters and figures in real time in fields such as computer-aided design and computer-assisted instruction .