Abstract: This paper introduces the principle of touch screen, analyses the reasons that influence the precision of coordinate location of resistive touch screen, and proposes a “three steps” method to improve the precision of coordinate location, including eliminate jitter method by using interrupt and polling, median filtering method and three points calibration method. It tests the algorithm based on developing board of S3C44B0X. Results show that the stability and precision of touch screen system are greatly improved.

Key words: touch screen, filtering, calibration

摘要： 介绍触摸屏系统的工作原理，分析影响电阻式触摸屏坐标定位精度的若干因素，提出一种提高坐标定位精度的“3步法”，包括采用中断和轮询相结合的方法去抖、中值平均滤波法滤波、三点法校准3个过程。在S3C44B0X开发板上进行算法测试，结果证明，用该方法校准的触摸屏系统的稳定性和精度得到很大改善。

关键词: 触摸屏, 滤波, 校准

CLC Number: 

• TP391