投射式电容屏触控轨迹Z字形噪声快速滤波算法

Fast filtering algorithm for zigzag noise of touch tracking of capacitive touch panels

投射式电容触摸屏(Capacitive Touch Panels,CTP)已成为智能终端人机交互界面的主流.针对屏体电极排布空隙造成的触控轨迹Z字形干扰问题,提出了一种基于IMAF模型的触控轨迹快速平滑滤波算法.通过触摸屏原始触控轨迹Z字形噪声特征与成因分析,以此建立适用于触控轨迹Z字形脉冲性干扰的非线性滤波模型,经时域串行轨迹数据的先入先出快速迭代处理,实现电容屏触控轨迹的平滑处理.实验测试结果证明:该算法兼具线性和统计滤波模型的滤波处理能力,相比传统触控轨迹滤波算法,可有效实现触控轨迹Z字形噪声的平滑处理.

Capacitive Touch Panels（CTP） have become the mainstream of human-computer inter-action interface in intelligent terminal. Generally, zigzag noise of touch tracking caused by voidage distribution of screen eletrode makes impact on the accuracy of predictions of touch posi-tions. A fast smooth processing algorithm for capacitive touch panels based on IMAF filter model has been proposed in this paper. Non-linear filter model applicable to zigzag pulse interference of touch tracking has been established on the basis of characteristic and genetic analysis of zigzag noise of original touch tracking in touch panels. Temporal serial trajectory data is processed by a first-in first-out fast iterative method so as to achieve the smooth processing of touch tracking of capacitive touch panels. Experimental results have indicated that this proposed algorithm has thecapacity of linear and statistical filter processing. Compared with traditional filtering algorithm of touch tracking,this proposed algorithm can achieve effective smooth processing for zigzag noiseof touch tracking.