基于Kalman滤波的电容屏触控轨迹平滑算法  

Smooth tracking with a kalman filter algorithm for capacitive touch panels

作　　者：李居朋[1] 张祖成 李墨羽 缪德芳 LI Ju-peng;ZHANG Zu-cheng;LI Mo-yu;MIAO De-fang(School of Electronic Information Engineering,Beijing Jiaotong University,Beijing 100044,China;Chipone Technology (Beijing)Co.,Ltd.,Beijing100088,China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]北京集创北方科技股份有限公司,北京100088

出　　处：《吉林大学学报（工学版）》2018年第6期1910-1916,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(81671034);北京市科技计划项目(D151100000415002)

摘　　要：针对触控信号易受多种噪声影响而出现触控失真问题,提出了基于Kalman滤波的电容屏触控轨迹平滑算法。通过搭建电容屏触控信号采集和测试平台,获取原始触控电容数据并分析触控轨迹噪声特征,以此建立触控轨迹平滑系统的状态模型和观测模型,经Kalman算法的时域迭代处理实现电容屏触控轨迹的噪声抑制。试验测试结果证明:本文触控轨迹平滑滤波算法对比于传统平滑滤波算法,在不增加计算量的同时获得了更好的轨迹平均平滑度,可用于电容式触摸屏应用系统。Capacitive touch panels (CTPs)have been more popular owing to their excellent interactive performance.However,electronic magnetic interference,display noise and process variation negatively influence the accuracy of predictions of touch positions.A smooth tracking algorithm for capacitance touch panels based on Kalman filter was proposed.The original touch capacitance data and touch noise characteristic were detected using a micro-controller unit and a sensor integrated circuit. Additionally,the noise of touch trajectory was suppressed by Kalman algorithm timely through process model and measurement model of touch trajectory smooth system.Experimental results indicate that the proposed touch trajectory smooth algorithm has better performance compared to the traditional filtering algorithms,and the algorithm can be used to CTP systems.

关 键 词：信息处理技术 电容式触摸屏 触控轨迹噪声 KALMAN滤波 轨迹质量评价 

分 类 号：TP319[自动化与计算机技术—计算机软件与理论]