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Capacitive touch sensing : Signal and image processing algorithms

机译:电容式触摸感应:信号和图像处理算法

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Capacitive touch sensors have been in use for many years, and recently gained center stage with the ubiquitous use in smart-phones. In this work we will analyze the most common method of projected capacitive sensing, that of absolute capacitive sensing, together with the most common sensing pattern, that of diamond-shaped sensors. After a brief introduction to the problem, and the reasons behind its popularity, we will formulate the problem as a reconstruction from projections. We derive analytic solutions for two simple cases: circular finger on a wire grid, and square finger on a square grid. The solutions give insight into the ambiguities of finding finger location from sensor readings. The main contribution of our paper is the discussion of interpolation algorithms including simple linear interpolation , curve fitting (parabolic and Gaussian), filtering, general look-up-table, and combinations thereof. We conclude with observations on the limits of the present algorithmic methods, and point to possible future research.
机译:电容式触摸传感器已经使用了很多年,并且随着智能手机的普遍使用,电容式触摸传感器最近成为人们关注的焦点。在这项工作中,我们将分析投射电容式感应的最常见方法,绝对电容式感应方法以及菱形传感器的最常见感应模式。在简要介绍了该问题及其流行背后的原因之后,我们将把该问题表述为根据预测进行的重构。我们推导出两种简单情况的解析解:线栅上的圆手指和方栅上的方形手指。该解决方案使人深入了解从传感器读数中查找手指位置的不确定性。本文的主要贡献是对插值算法的讨论,包括简单的线性插值,曲线​​拟合(抛物线和高斯曲线),滤波,通用查找表及其组合。我们以对当前算法方法的局限性的观察作为结论,并指出可能的未来研究。

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