Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan.
Sensors (Basel). 2021 Jan 28;21(3):859. doi: 10.3390/s21030859.
HumTouch is a touch sensing technology utilizing the environmental electromagnetic wave. The method can be realized using conductive and semi-conductive materials by simply attaching electrodes to the object's surface. In this study, we compared three methods for localizing a touch on 20×16cm2 and 40×36cm2 papers, on which four or eight electrodes were attached to record the voltages leaked from the human fingertip. The number and positions of the electrodes and the data processing of the voltages differed according to the localization methods. By constructing a kernel regression analysis model between the electrode outputs and the actual physical locations, the touched locations were estimated. Each of the three methods was tested via leave-one-out cross validation. Out of the three methods discussed, two exhibited superior performances in terms of the estimation errors. Of these two methods, one simply uses the voltages recorded by the four electrodes attached on the middle of paper edges as inputs to the regression system. The other uses differential outputs of electrode pairs as the inputs. The smallest mean location errors were 0.31 cm on 20×16cm2 paper and 0.27 cm on 40×36cm2 paper, which are smaller than the size of a fingertip.
HumTouch 是一种利用环境电磁波进行触摸感应的技术。该方法可以通过在物体表面简单地附加电极，使用导电和半导体材料来实现。在这项研究中，我们比较了三种方法来定位 20×16cm2 和 40×36cm2 纸张上的触摸位置，在这些纸张上分别附加了四个或八个电极来记录从人指尖泄漏的电压。根据定位方法的不同，电极的数量和位置以及电压的处理方式也有所不同。通过在电极输出和实际物理位置之间构建核回归分析模型，可以估计被触摸的位置。三种方法都通过留一法交叉验证进行了测试。在讨论的三种方法中，有两种方法在估计误差方面表现出更好的性能。这两种方法中的一种方法简单地使用附在纸张边缘中间的四个电极记录的电压作为回归系统的输入。另一种方法则使用电极对的差分输出作为输入。在 20×16cm2 纸上，最小的平均位置误差为 0.31cm，在 40×36cm2 纸上，最小的平均位置误差为 0.27cm，这都小于指尖的大小。
