Data Acquisition And Pretreatment Of On-line Signature Based On Embedded System

With the fast development of modern electronic information technology and network communication technology, personally electronic identify will be the development trend of the future society. Identify verification based biologic character i s the most method because the facility, security and un-imitative. It is hot point of research what kinds of biologic characters used for the identify verification. This paper first introduces some popular methods, and points their advantages and shortcomings, and gives us a total impress.Then paper introduces the data acquisition system based on-line dynamic signature importantly, just uses the touch panel and touch panel controller ADS7846 to collect multidimensional data to confirm the identify, the data collected not only includes x-coordinate and y-coordinate, but also includes press information, because the press information will not displays at LCI) screen, so it is difficult to fabricate and improve the security greatly.The total system includes the data acquisition part and pretreatment part. Chapter 2 to Chapter 6 is data acquisition part, tells us how to collect data and display it, then save it in computer . The data acquisition part includes data collected system, display system, commnication system and control system. Chapter 3-Data acquisition system introduces the working theory of the touch panel and ADS7846, tells us how to measure pressure information. Chapter 4 Display system tells us the working theory of LCD screen controller SED1335. Chapter5-Communication introduces serial communication and USB communication. Chapter 6-Control system introduces the single-chip how to communicate with other systems. Chapter 7- Pretreatment part mostly explains the reason wrong data appears and give some ways to resolve it. At last, simply introduces some popular arithmetic for data matching.