互电容触控坐标精确处理和上报算法

发布时间：2018-04-28 21:01

  本文选题：互电容 + 触控坐标　； 参考：《电视技术》2016年10期

【摘要】：在触控屏上用手指或触控笔划动时,由于手抖、噪声及不稳定的感应信号,触控轨迹会产生不期望的震荡,呈现出锯齿波和曲线断点,导致用户体验很差。针对此问题,提出了一种基于互电容的触控坐标精确上报的处理算法。通过微控制器对触控坐标原始数据的处理,找到触发时电容信号的相对变化峰值及高于阈值门限的等高线轮廓,再通过轮廓插值得到不规则多边形,利用其顶点的凹凸性区分两个或多个触控点,并计算多边形的质心,确定划线标识,再通过线性二次指数平滑滤波后,实现了坐标数据的精确上报。滤波后的坐标轨迹视觉上更加平滑,结果表明该算法能消除曲线边缘的锯齿波及曲线断点,成功地处理触控信息。
[Abstract]:When touching with fingers or touch strokes on the touch screen, due to the shaking of the hand, noise and unstable induction signal, the touch track will produce unwanted vibration, showing sawtooth waves and curve breakpoints, resulting in poor user experience. In order to solve this problem, an algorithm for accurate reporting of touch coordinates based on mutual capacitance is proposed. Through the processing of the original data of touch coordinates by the microcontroller, the peak value of the relative change of the capacitance signal and the contour contour above the threshold value of the trigger are found, and the irregular polygon is obtained by interpolation of the contours. By using the concavity and convexity of its vertices, two or more touch points are distinguished, the centroid of polygon is calculated, the marking is determined, and the coordinate data is accurately reported through linear quadratic exponential smoothing filtering. The results show that the proposed algorithm can eliminate the sawtooth and curve breakpoints at the edge of the curve and process the touch information successfully.
【作者单位】： 中国科学院上海高等研究院;中国科学院大学;上海磐启微电子有限公司;
【分类号】：TN873;TP301.6
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本文编号：1816846